diff --git a/.coveragerc b/.coveragerc
deleted file mode 100644
index b3c7d0a2..00000000
--- a/.coveragerc
+++ /dev/null
@@ -1,4 +0,0 @@
-[run]
-branch = True
-source = yabgp
-omit = yabgp/tests/*
diff --git a/.dockerignore b/.dockerignore
new file mode 100644
index 00000000..f1d8cece
--- /dev/null
+++ b/.dockerignore
@@ -0,0 +1,66 @@
+# Python
+__pycache__/
+*.py[cod]
+*.pyo
+*.pyd
+*.so
+
+# Virtual environments
+.venv/
+venv/
+env/
+mac-venv/
+mac-venv-py313/
+
+# uv cache
+.uv/
+
+# Distribution / build
+build/
+dist/
+*.egg-info/
+*.egg
+
+# Testing / coverage
+.tox/
+htmlcov/
+.coverage
+.coverage.*
+.pytest_cache/
+.ruff_cache/
+.pyright/
+coverage.xml
+
+# Version control
+.git/
+.gitignore
+
+# IDE / editor
+.idea/
+.vscode/
+*.DS_Store
+
+# Documentation build output
+doc/build/
+
+# Secrets / local config
+etc/yabgp/yabgp.ini
+
+# CI
+.github/
+
+# Cursor AI
+.claude/
+.cursor/
+
+# Development-only directories (not needed in production image)
+tools/
+doc/
+example/
+bin/
+yabgp/tests/
+
+# Documentation files
+*.rst
+*.md
+.mailmap
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 6948a596..58bb5e41 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -1,4 +1,4 @@
-# This workflow will install Python dependencies, run tests with a variety of Python versions
+# This workflow installs Python dependencies and runs tests on Python 3.13
 # For more information see: https://help.github.com/actions/language-and-framework-guides/using-python-with-github-actions
 
 name: CI
@@ -17,32 +17,33 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        # https://docs.github.com/en/actions/using-github-hosted-runners/about-github-hosted-runners/about-github-hosted-runners#supported-runners-and-hardware-resources
-        os: [ ubuntu-20.04, macos-latest, windows-latest ]
-        python-version: [ "3.6", "3.x" ]
-        exclude:
-          - python-version: "3.x"
+        os: [ ubuntu-latest, macos-latest, windows-latest ]
+        python-version: [ "3.13" ]
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v3
+        uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
 
+      - name: Set up uv
+        uses: astral-sh/setup-uv@v5
+
       - name: Display Python version
         run: python -c "import sys; print(sys.version)"
 
-      - name: Install tox and other dependencies
+      - name: Sync dependencies
         run: |
-          python -m pip install --upgrade pip setuptools wheel
-          python -m pip install tox
-          python -m pip install -r requirements.txt
-          python -m pip install -r test-requirements.txt
+          uv --version
+          uv sync --locked --group test --group dev
+
+      - name: Run tests
+        run: uv run pytest yabgp/tests/unit/ --tb=short -q
 
-      - name: Run tox
-        run: tox -e pep8 -c tox.ini
+      - name: Lint
+        run: uv run ruff check yabgp/
 
-      - name: Run unittest
-        run: python run_test.py
+      - name: Type check
+        run: uv run pyright -p pyrightconfig.json
diff --git a/.gitignore b/.gitignore
index e3690a84..fcfbc595 100644
--- a/.gitignore
+++ b/.gitignore
@@ -36,9 +36,13 @@ pip-delete-this-directory.txt
 # Unit test / coverage reports
 htmlcov/
 .tox/
+.venv/
+.ruff_cache/
+.pyright/
 .coverage
 .coverage.*
 .cache
+.pytest_cache/
 nosetests.xml
 coverage.xml
 *,cover
@@ -70,3 +74,5 @@ covhtml/
 doc/build
 *.DS_Store
 .vscode/settings.json
+mac-venv/
+.claude/
diff --git a/.testr.conf b/.testr.conf
deleted file mode 100644
index c1f9c13f..00000000
--- a/.testr.conf
+++ /dev/null
@@ -1,4 +0,0 @@
-[DEFAULT]
-test_command=OS_STDOUT_CAPTURE=1 OS_STDERR_CAPTURE=1 OS_LOG_CAPTURE=1 ${PYTHON:-python} -m subunit.run discover -t ./ ${OS_TEST_PATH:-./yabgp/tests/unit} $LISTOPT $IDOPTION
-test_id_option=--load-list $IDFILE
-test_list_option=--list
\ No newline at end of file
diff --git a/Dockerfile b/Dockerfile
index 3c31cc7c..0f6f02be 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,19 +1,25 @@
-FROM python:2.7.14-alpine
+FROM python:3.13-alpine
 
 LABEL maintainer="Peng Xiao <xiaoquwl@gmail.com>"
 
+# Install uv binary from official image
+COPY --from=ghcr.io/astral-sh/uv:0.9.15 /uv /bin/uv
+
 RUN apk add --no-cache gcc musl-dev g++
 
-ADD . /yabgp
+COPY . /yabgp
 
 WORKDIR /yabgp
 
-RUN pip install -r requirements.txt && python setup.py install
+ENV UV_LINK_MODE=copy
+
+RUN --mount=type=cache,target=/root/.cache/uv \
+    uv sync --locked --no-dev
 
 EXPOSE 8801
 
 VOLUME ["~/data"]
 
-ENTRYPOINT ["/usr/local/bin/yabgpd"]
+ENTRYPOINT ["/yabgp/.venv/bin/yabgpd"]
 
 CMD []
diff --git a/HACKING.rst b/HACKING.rst
index aed265ce..a51d62f8 100644
--- a/HACKING.rst
+++ b/HACKING.rst
@@ -15,19 +15,29 @@ Step 3: Read on
 Running Tests
 -------------
 
-Run tox
+Using uv + pytest (recommended):
 
 .. code:: bash
-  
+
   $ cd yabgp
-  $ tox
+  $ uv sync --group test --group dev
+  $ uv run pytest yabgp/tests/unit/ -v
+
+Running Lint / Type Check
+-------------------------
+
+.. code:: bash
+
+  $ cd yabgp
+  $ uv run ruff check yabgp/ --exclude yabgp/tests
+  $ uv run pyright
+
 
 Building Docs
 -------------
 
-Run tox
-
 .. code:: bash
-  
+
   $ cd yabgp
-  $ tox
+  $ uv sync --group docs
+  $ uv run sphinx-build -b html doc/source doc/build
diff --git a/README-zh.rst b/README-zh.rst
index 2a94d6c9..62ebe464 100644
--- a/README-zh.rst
+++ b/README-zh.rst
@@ -12,21 +12,22 @@ YABGP是另一种BGP协议的Python实现。它可以和各种路由器（包括
 
 我们严格遵循RFCs文档的约定开发此项目。
 
-此软件可应用于Linux/Unix，Mac OS和windows系统。
+此软件可应用于Linux/Unix、Mac OS和Windows系统。需要 Python >= 3.13。
+TCP MD5认证仅支持Linux。
 
 功能
 ~~~~~~~~
 
 -  它可以通过IPv4地址以主动模式（作为TCP客户端）建立BGP会话连接。
 
--  支持TCP的MD5认证（只有IPv4并且不支持windows系统）
+-  支持TCP的MD5认证（只有IPv4）
 
 -  BGP capabilities支持：4字节的ASN，Route Refresh(Cisco Route Refresh)，添加发送/接收路径；
 
 -  地址族支持：
 
    - IPv4/IPv6 Unicast
-   
+
    - IPv4/IPv6 Labeled Unicast
 
    - IPv4 Flowspec(有限支持)
@@ -36,7 +37,7 @@ YABGP是另一种BGP协议的Python实现。它可以和各种路由器（包括
    - IPv4/IPv6 MPLSVPN
 
    - EVPN (部分支持)
-   
+
 -  解析所有BGP messages为json格式并写入本地文件（可配置）；
 
 -  支持通过基本的RESTFUL API获取对等体运行信息或者发送BGP messages。
@@ -44,32 +45,29 @@ YABGP是另一种BGP协议的Python实现。它可以和各种路由器（包括
 快速开始
 ~~~~~~~~~~~
 
-我们推荐在python的虚拟环境中运行``yabgp``，可以通过源码或者pip工具安装
-
-源码安装：
+**使用 uv（推荐）：**
 
 .. code:: bash
 
-    $ virtualenv yabgp-virl
-    $ source yabgp-virl/bin/activate
     $ git clone https://github.com/smartbgp/yabgp
     $ cd yabgp
-    $ pip install -r requirements.txt
-    $ cd bin
-    $ python yabgpd -h
+    $ uv sync
+    $ uv run yabgpd -h
 
-pip安装：
+**使用 pip：**
 
 .. code:: bash
 
-    $ virtualenv yabgp-virl
-    $ source yabgp-virl/bin/activate
     $ pip install yabgp
-    $ which yabgpd
-    /home/yabgp/yabgp-virl/bin/yabgpd
     $ yabgpd -h
 
-例如：
+**使用 Docker：**
+
+.. code:: bash
+
+    $ docker run -it smartbgp/yabgp:latest --bgp-afi_safi=ipv4 --bgp-local_as=65022 --bgp-remote_addr=10.75.44.219 --bgp-remote_as=65022
+
+**例如：**
 
 .. code:: bash
 
@@ -90,8 +88,6 @@ pip安装：
 支持
 ~~~~~~~
 
-加入Slack，欢迎问题与建议，我们一起讨论。http://smartbgp.slack.com/
-
 可以发送email到xiaoquwl@gmail.com，或者在GitHub上提issue。
 
 贡献
diff --git a/README.rst b/README.rst
index be0c9867..68ee0c3b 100644
--- a/README.rst
+++ b/README.rst
@@ -1,11 +1,11 @@
 简体中文_
- 
+
 .. _简体中文: README-zh.rst
 
 YABGP
 =====
 
-|Docker| |Version| |License| |Build Status| |Code Health| |Documentation Status| |Test Coverage| |Downloads|
+|License| |Version| |CI| |Documentation Status|
 
 
 What is yabgp?
@@ -17,11 +17,12 @@ simulators like GNS3) and receive/parse BGP messages for
 future analysis.
 
 Support sending BGP messages(route refresh/update) to the peer through RESTful API. YABGP can't send any BGP update messages
-by itself, it's just a agent, so there can be many agents and they can be controlled by a contoller.
+by itself, it's just a agent, so there can be many agents and they can be controlled by a controller.
 
 We write it in strict accordance with the specifications of RFCs.
 
-This software can be used on Linux/Unix, Mac OS and Windows systems.
+This software can be used on Linux/Unix, Mac OS and Windows systems. Python >= 3.13 required.
+TCP MD5 authentication is only supported on Linux.
 
 Features
 ~~~~~~~~
@@ -29,8 +30,7 @@ Features
 -  It can establish BGP session based on IPv4 address (TCP Layer) in
    active mode(as TCP client);
 
--  Support TCP MD5 authentication(IPv4 and does not support Windows
-   now);
+-  Support TCP MD5 authentication(IPv4 only);
 
 -  BGP capabilities support: 4 Bytes ASN, Route Refresh(Cisco Route Refresh), Add Path send/receive;
 
@@ -55,45 +55,33 @@ Features
 Quick Start
 ~~~~~~~~~~~
 
-We recommend run ``yabgp`` through python virtual-env from source
-code or pip install
-
-Use yabgp from source code:
+**Using uv (recommended):**
 
 .. code:: bash
 
-    $ virtualenv yabgp-virl
-    $ source yabgp-virl/bin/activate
     $ git clone https://github.com/smartbgp/yabgp
     $ cd yabgp
-    $ pip install -r requirements.txt
-    $ cd bin
-    $ python yabgpd -h
+    $ uv sync
+    $ uv run yabgpd -h
 
-Use pip install
+**Using pip:**
 
 .. code:: bash
 
-    $ virtualenv yabgp-virl
-    $ source yabgp-virl/bin/activate
     $ pip install yabgp
-    $ which yabgpd
-    /home/yabgp/yabgp-virl/bin/yabgpd
     $ yabgpd -h
 
-For example:
+**Using Docker:**
 
 .. code:: bash
 
-    $ yabgpd --bgp-local_addr=1.1.1.1 --bgp-local_as=65001 --bgp-remote_addr=1.1.1.2 --bgp-remote_as=65001 --bgp-afi_safi=ipv4
+    $ docker run -it smartbgp/yabgp:latest --bgp-afi_safi=ipv4 --bgp-local_as=65022 --bgp-remote_addr=10.75.44.219 --bgp-remote_as=65022
 
-Use Docker container
+**Example:**
 
 .. code:: bash
 
-    $ docker run -it smartbgp/yabgp:latest --bgp-afi_safi=ipv4 --bgp-local_as=65022 --bgp-remote_addr=10.75.44.219 --bgp-remote_as=65022
-
-More docker image tags, please reference https://hub.docker.com/r/smartbgp/yabgp/tags/
+    $ yabgpd --bgp-local_addr=1.1.1.1 --bgp-local_as=65001 --bgp-remote_addr=1.1.1.2 --bgp-remote_as=65001 --bgp-afi_safi=ipv4
 
 Documentation
 ~~~~~~~~~~~~~
@@ -110,8 +98,6 @@ A BGP update generator based on YaBGP https://github.com/trungdtbk/bgp-update-ge
 Support
 ~~~~~~~
 
-Please join our Slack_ for questions, discussion, suggestions, etc
-
 Send email to xiaoquwl@gmail.com, or use GitHub issue system.
 
 
@@ -131,27 +117,14 @@ https://github.com/wikimedia/PyBal/blob/master/pybal/bgp.py,
 and message parsing, we reference from
 https://github.com/Exa-Networks/exabgp
 
-.. |License| image:: https://img.shields.io/hexpm/l/plug.svg
+.. |License| image:: https://img.shields.io/badge/license-Apache%202.0-blue.svg
    :target: https://github.com/smartbgp/yabgp/blob/master/LICENSE
-.. |Build Status| image:: https://travis-ci.org/smartbgp/yabgp.svg?branch=master
-   :target: https://travis-ci.org/smartbgp/yabgp
 
-.. |Code Health| image:: https://landscape.io/github/smartbgp/yabgp/master/landscape.svg?style=flat
-   :target: https://landscape.io/github/smartbgp/yabgp/master
+.. |CI| image:: https://github.com/smartbgp/yabgp/actions/workflows/ci.yml/badge.svg?branch=master
+   :target: https://github.com/smartbgp/yabgp/actions/workflows/ci.yml
 
 .. |Documentation Status| image:: https://readthedocs.org/projects/yabgp/badge/?version=latest
    :target: https://readthedocs.org/projects/yabgp/?badge=latest
 
-.. |Test Coverage| image:: https://coveralls.io/repos/smartbgp/yabgp/badge.svg?branch=master
-   :target: https://coveralls.io/r/smartbgp/yabgp
-
-.. |Version| image:: https://img.shields.io/pypi/v/yabgp.svg?
-   :target: http://badge.fury.io/py/yabgp
-
-.. |Downloads| image:: https://img.shields.io/pypi/dm/yabgp.svg?
-   :target: https://pypi.python.org/pypi/yabgp
-
-.. |Docker| image:: https://img.shields.io/docker/automated/jrottenberg/ffmpeg.svg?style=plastic   
-   :target: https://hub.docker.com/r/smartbgp/yabgp/
-   
-.. _Slack: https://join.slack.com/t/smartbgp/shared_invite/enQtNzQwNjgzNTA5NjA3LTY3YzFkODMzYWFjODI1ZmE3NDRkMTQwYTY0MWZiMmE3M2NiMzM0ZTI3NjNjY2RkNDAzMmFkZWJkOTE2M2VjOWU
+.. |Version| image:: https://img.shields.io/pypi/v/yabgp.svg
+   :target: https://pypi.org/project/yabgp/
diff --git a/doc/requirements.txt b/doc/requirements.txt
deleted file mode 100644
index 57d9ab01..00000000
--- a/doc/requirements.txt
+++ /dev/null
@@ -1,10 +0,0 @@
-sphinx
-sphinx_rtd_theme
-pbr==2.0.0
-oslo.config==2.1.0
-Twisted==20.3.0
-Flask==1.0
-Flask-HTTPAuth==2.5.0
-netaddr>=0.7.12
-future>=0.16.0
-py-radix==0.10.0
\ No newline at end of file
diff --git a/doc/source/extension.rst b/doc/source/extension.rst
index 03b40831..56639391 100644
--- a/doc/source/extension.rst
+++ b/doc/source/extension.rst
@@ -15,7 +15,6 @@ please reference the ``DefaultHandler``.
     #!/usr/bin/python
     # -*- coding: utf-8 -*-
 
-    from __future__ import print_function
     import sys
 
     from yabgp.agent import prepare_service
@@ -72,7 +71,7 @@ How to run it? very simple! let's call this file as ``my_bgpd.py``, and you can
 
 .. note::
 
-    Please make sure you have install yabgp for requirements, you can do that through ``pip install yabgp``
+    Please make sure you have installed yabgp: ``pip install yabgp`` or ``uv sync``
 
 
 .. code:: bash
diff --git a/doc/source/feature.rst b/doc/source/feature.rst
index f0654f64..83c98ca7 100644
--- a/doc/source/feature.rst
+++ b/doc/source/feature.rst
@@ -4,8 +4,7 @@ Features
 -  It can establish BGP session based on IPv4 address (TCP Layer) in
    active mode(as TCP client);
 
--  Support TCP MD5 authentication(IPv4 and does not support Windows
-   now);
+-  Support TCP MD5 authentication(IPv4 only, Linux only);
 
 -  BGP capabilities support: 4 Bytes ASN, Route Refresh(Cisco Route Refresh), Add Path send/receive;
 
@@ -25,7 +24,8 @@ Features
 
 -  Support basic RESTFUL API for getting running information and sending BGP messages.
 
--  Platform support:  Linux/Unix(recommended), Mac OS and Windows.
+-  Platform support: Linux/Unix (recommended), Mac OS, Windows.
+   TCP MD5 authentication is only supported on Linux.
 
 .. note::
 
diff --git a/doc/source/index.rst b/doc/source/index.rst
index 78fd4859..8429b725 100644
--- a/doc/source/index.rst
+++ b/doc/source/index.rst
@@ -12,7 +12,7 @@ simulators like GNS3) and receive/parse BGP messages for
 future analysis.
 
 Support sending BGP messages(route refresh/update) to the peer through RESTful API. YABGP can't send any BGP update messages
-by itself, it's just a agent, so there can be many agents and they can be controlled by a contoller.
+by itself, it's just an agent, so there can be many agents and they can be controlled by a controller.
 
 
 Table of Contents
diff --git a/doc/source/install.rst b/doc/source/install.rst
index cd5a3ff8..dbb914b3 100644
--- a/doc/source/install.rst
+++ b/doc/source/install.rst
@@ -1,40 +1,30 @@
 Installation
 ============
 
-We recommend run ``yabgp`` through python virtual-env from source
-code or pip install
+Python >= 3.13 is required.
 
-From source code
-~~~~~~~~~~~~~~~~
-
-Use yabgp from source code:
+From source (using uv)
+~~~~~~~~~~~~~~~~~~~~~~
 
 .. code:: bash
 
-    $ virtualenv yabgp-virl
-    $ source yabgp-virl/bin/activate
     $ git clone https://github.com/smartbgp/yabgp
     $ cd yabgp
-    $ pip install -r requirements.txt
-    $ cd bin
-    $ python yabgpd -h
+    $ uv sync
+    $ uv run yabgpd -h
 
 From pip
 ~~~~~~~~
 
-Use pip install
-
 .. code:: bash
 
-    $ virtualenv yabgp-virl
-    $ source yabgp-virl/bin/activate
     $ pip install yabgp
-    $ which yabgpd
-    /home/yabgp/yabgp-virl/bin/yabgpd
     $ yabgpd -h
 
-.. note::
+Using Docker
+~~~~~~~~~~~~
+
+.. code:: bash
 
-    For ``virtualenv``, you can install it from pip. And make sure you have installed ``python-dev`` based on
-    your operation system, for example Ubuntu, you can install it from ``apt-get install python-dev``.
-    otherwise, you may get error when install requirement from requirements.txt
\ No newline at end of file
+    $ docker run -it smartbgp/yabgp:latest --bgp-afi_safi=ipv4 \
+        --bgp-local_as=65022 --bgp-remote_addr=10.75.44.219 --bgp-remote_as=65022
diff --git a/doc/source/tutorial.rst b/doc/source/tutorial.rst
index effefd88..bb93712b 100644
--- a/doc/source/tutorial.rst
+++ b/doc/source/tutorial.rst
@@ -19,9 +19,10 @@ The simple way to start a yabgp agent is (There are four mandatory parameters):
 
 The default address family will be IPv4 unicast. If you need support other address family, you can use something like:
 
-```
-$ yabgpd --bgp-local_addr=10.75.44.122 --bgp-local_as=100 --bgp-remote_addr=10.75.195.199 --bgp-remote_as=100 --bgp-afi_safi=ipv4_srte,flowspec,ipv4,bgpls
-```
+.. code:: bash
+
+    $ yabgpd --bgp-local_addr=10.75.44.122 --bgp-local_as=100 --bgp-remote_addr=10.75.195.199 \
+             --bgp-remote_as=100 --bgp-afi_safi=ipv4_srte,flowspec,ipv4,bgpls
 
 that session will suport: IPv4 Unicast, IPv4 Flowspec, IPv4 SR TE and BGP linkstate.
 
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 00000000..0bbed2e9
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,88 @@
+[build-system]
+requires = ["hatchling>=1.27.0"]
+build-backend = "hatchling.build"
+
+[tool.hatch.version]
+path = "yabgp/__init__.py"
+
+[project]
+name = "yabgp"
+dynamic = ["version"]
+description = "Yet Another Border Gateway Protocol Python Implementation"
+readme = "README.rst"
+requires-python = ">=3.13"
+license = { text = "Apache License 2.0" }
+authors = [{ name = "SmartBGP project team", email = "xiaoquwl@gmail.com" }]
+keywords = ["BGP", "SDN"]
+classifiers = [
+  "Development Status :: 5 - Production/Stable",
+  "Environment :: Console",
+  "License :: OSI Approved :: Apache Software License",
+  "Natural Language :: English",
+  "Operating System :: Unix",
+  "Operating System :: MacOS",
+  "Operating System :: Microsoft :: Windows",
+  "Programming Language :: Python",
+  "Programming Language :: Python :: 3.13",
+  "Topic :: System :: Networking",
+]
+dependencies = [
+  "Flask==3.1.3",
+  "Flask-HTTPAuth==4.8.1",
+  "Twisted==25.5.0",
+  "netaddr==1.3.0",
+  "oslo.config==10.3.0",
+  "py-radix==1.1.0",
+  "simplejson==4.1.1",
+]
+
+[project.urls]
+Homepage = "https://smartbgp.github.io/"
+
+[project.scripts]
+yabgpd = "yabgp.agent.cmd:main"
+
+[dependency-groups]
+test = [
+  "coverage>=7.0",
+  "pytest>=8.0",
+  "pytest-cov>=5.0",
+]
+dev = [
+  "pyright>=1.1.402",
+  "ruff>=0.11.10",
+]
+docs = [
+  "sphinx>=8.0",
+  "sphinx-rtd-theme>=3.0",
+]
+
+[tool.hatch.build.targets.wheel]
+packages = ["yabgp"]
+
+[tool.hatch.build.targets.wheel.shared-data]
+"etc/yabgp/yabgp.ini.sample" = "etc/yabgp/yabgp.ini.sample"
+
+[tool.hatch.build.targets.sdist]
+include = [
+  "/etc/yabgp/yabgp.ini.sample",
+  "/yabgp",
+  "/README.rst",
+]
+
+[tool.coverage.run]
+branch = true
+source = ["yabgp"]
+omit = ["yabgp/tests/*"]
+
+[tool.ruff]
+line-length = 120
+target-version = "py313"
+
+[tool.ruff.lint]
+select = ["E", "W", "F", "I", "UP"]
+
+[tool.ruff.lint.per-file-ignores]
+# Module docstring before imports triggers false E402; no executable code precedes imports here
+"yabgp/message/attribute/nlri/ipv4_unicast.py" = ["E402"]
+
diff --git a/pyrightconfig.json b/pyrightconfig.json
new file mode 100644
index 00000000..21e72c21
--- /dev/null
+++ b/pyrightconfig.json
@@ -0,0 +1,14 @@
+{
+  "include": [
+    "yabgp"
+  ],
+  "typeCheckingMode": "off",
+  "reportDeprecated": "error",
+  "exclude": [
+    ".venv",
+    ".git",
+    "build",
+    "dist",
+    "doc"
+  ]
+}
diff --git a/redhat/python-yabgp.spec b/redhat/python-yabgp.spec
deleted file mode 100644
index 8bed39f9..00000000
--- a/redhat/python-yabgp.spec
+++ /dev/null
@@ -1,74 +0,0 @@
-%{!?__python2:        %global __python2 /usr/bin/python2}
-%{!?python2_sitelib:  %global python2_sitelib %(%{__python2} -c "from distutils.sysconfig import get_python_lib; print(get_python_lib())")}
-
-Name:           python-yabgp
-Version:        0.1.4
-Release:        0%{?dist}
-Summary:        Yet Another BGP (Border Gateway Protocol) Python Implementation
-
-Group:          Development/Libraries
-License:        APLv2
-URL:            http://yabgp.readthedocs.org/en/latest/
-Source0:        https://github.com/smartbgp/yabgp/archive/v%{version}.tar.gz
-Source1:        yabgp.service
-BuildArch:      noarch
-Provides:       yabgp-libs
-
-BuildRequires:  python-setuptools
-Requires:       python2 >= 2.6
-#Requires:       python-pbr >= 0.5.21, python-pymongo >= 3.0.3, python-netaddr >= 0.7.12, python-flask >= 0.10.1, python-pika >= 0.9.14, python-flask-httpauth >= 2.5.0, python-twisted >= 15.0.0, python-oslo-config >= 1.6.0
-
-%description
-YABGP python module
-
-%package -n yabgp
-Summary:        Yet Another BGP (Border Gateway Protocol)
-Group:          Applications/Internet
-BuildRequires:  systemd-units
-Requires:       systemd, yabgp-libs == %{version}
-
-%description -n yabgp
-YABGP is a yet another Python implementation for BGP Protocol. It can be used 
-to establish BGP connections with all kinds of routers (include real 
-Cisco/HuaWei/Juniper routers and some router simulators like GNS3) and 
-receive/parse BGP messages for future analysis.
-
-%prep
-%autosetup -n yabgp-%{version}
-
-%build
-%{__python2} setup.py build
-
-%install
-%{__python2} setup.py install -O1 --root ${RPM_BUILD_ROOT}
-
-# fix file locations
-mv ${RPM_BUILD_ROOT}/usr/bin ${RPM_BUILD_ROOT}%{_sbindir}
-mv ${RPM_BUILD_ROOT}/usr/etc  ${RPM_BUILD_ROOT}/%{_sysconfdir}
-
-install -d %{buildroot}/%{_unitdir}
-install %{SOURCE1} %{buildroot}/%{_unitdir}/
-
-%post -n yabgp
-%systemd_post yabgp.service
-
-%preun -n yabgp
-%systemd_preun yabgp.service
-
-%postun -n yabgp
-%systemd_postun_with_restart yabgp.service
-
-%files
-%defattr(-,root,root,-)
-%{python2_sitelib}/*
-%doc LICENSE README.rst requirements.txt
-
-%files -n yabgp
-%defattr(-,root,root,-)
-%attr(755, root, root) %{_sbindir}/yabgpd
-%dir %{_sysconfdir}/yabgp
-%attr(744, root, root) %{_sysconfdir}/yabgp/*
-%{_unitdir}/yabgp.service
-%doc LICENSE README.rst
-
-%changelog
diff --git a/redhat/yabgp.service b/redhat/yabgp.service
deleted file mode 100644
index 69655b00..00000000
--- a/redhat/yabgp.service
+++ /dev/null
@@ -1,11 +0,0 @@
-[Unit]
-Description=YABGP
-After=network.target
-
-[Service]
-ConditionPathExists=/etc/yabgp/yabgp.ini
-ExecStart=/usr/sbin/yabgp /etc/yabgp/yabgp.ini
-ExecReload=/bin/kill -USR1 $MAINPID
-
-[Install]
-WantedBy=multi-user.target
diff --git a/requirements.txt b/requirements.txt
deleted file mode 100644
index 2fec925d..00000000
--- a/requirements.txt
+++ /dev/null
@@ -1,9 +0,0 @@
-pbr==2.0.0
-oslo.config==2.1.0
-Twisted==20.3.0
-Flask==1.0
-Flask-HTTPAuth==2.5.0
-netaddr==0.8.0
-future>=0.16.0
-py-radix==0.10.0
-simplejson==3.17.0
diff --git a/run_test.py b/run_test.py
deleted file mode 100644
index ece3e022..00000000
--- a/run_test.py
+++ /dev/null
@@ -1,28 +0,0 @@
-# Copyright 2015-2018 Cisco Systems, Inc.
-# All rights reserved.
-#
-#    Licensed under the Apache License, Version 2.0 (the "License"); you may
-#    not use this file except in compliance with the License. You may obtain
-#    a copy of the License at
-#
-#         http://www.apache.org/licenses/LICENSE-2.0
-#
-#    Unless required by applicable law or agreed to in writing, software
-#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
-#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-#    License for the specific language governing permissions and limitations
-#    under the License.
-
-import unittest
-
-
-def test():
-    "test load and run"
-    tests = unittest.TestLoader().discover('.', pattern='test*.py')
-    result = unittest.TextTestRunner(verbosity=2).run(tests)
-    if not result.wasSuccessful():
-        raise ValueError('unittest failed')
-
-
-if __name__ == '__main__':
-    test()
diff --git a/setup.cfg b/setup.cfg
deleted file mode 100644
index 8eb7f7b1..00000000
--- a/setup.cfg
+++ /dev/null
@@ -1,42 +0,0 @@
-[metadata]
-name = yabgp
-summary = Yet Another Border Gateway Protocol Python Implementation
-license = Apache License 2.0
-author = SmartBGP project team
-author-email = xiaoquwl@gmail.com
-home-page = http://smartbgp.github.io/
-description-file = README.rst
-platform = any
-classifier =
-    Development Status :: 5 - Production/Stable
-    Environment :: Console
-    License :: OSI Approved :: Apache Software License
-    Topic :: System :: Networking
-    Natural Language :: English
-    Programming Language :: Python
-    Programming Language :: Python :: 2.7
-    Programming Language :: Python :: 3.4
-    Programming Language :: Python :: 3.5
-    Operating System :: Unix
-keywords =
-    BGP
-    SDN
-
-[build_sphinx]
-all_files = 1
-build-dir = doc/build
-source-dir = doc/source
-
-[global]
-setup-hooks =
-    yabgp.hooks.setup_hook
-
-[files]
-packages =
-    yabgp
-data_files =
-    etc/yabgp/ =
-        etc/yabgp/yabgp.ini.sample
-[entry_points]
-console_scripts =
-    yabgpd = yabgp.agent.cmd:main
diff --git a/setup.py b/setup.py
deleted file mode 100644
index 358555eb..00000000
--- a/setup.py
+++ /dev/null
@@ -1,25 +0,0 @@
-# Copyright 2015 Cisco Systems, Inc.
-# All rights reserved.
-#
-#    Licensed under the Apache License, Version 2.0 (the "License"); you may
-#    not use this file except in compliance with the License. You may obtain
-#    a copy of the License at
-#
-#         http://www.apache.org/licenses/LICENSE-2.0
-#
-#    Unless required by applicable law or agreed to in writing, software
-#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
-#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-#    License for the specific language governing permissions and limitations
-#    under the License.
-
-import setuptools
-
-import yabgp.hooks
-
-yabgp.hooks.save_orig()
-
-setuptools.setup(
-    name='yabgp',
-    setup_requires=['pbr'],
-    pbr=True)
diff --git a/test-requirements.txt b/test-requirements.txt
deleted file mode 100644
index dafdd65c..00000000
--- a/test-requirements.txt
+++ /dev/null
@@ -1,6 +0,0 @@
-nose==1.3.6
-flake8==2.4.0
-six>=1.10.0
-coverage
-testrepository>=0.0.13
-testtools>=0.9.26
diff --git a/tools/rabbit_mongo.sh b/tools/rabbit_mongo.sh
deleted file mode 100755
index eeead016..00000000
--- a/tools/rabbit_mongo.sh
+++ /dev/null
@@ -1,60 +0,0 @@
-#!/usr/bin/env bash
-
-# Copyright 2015 Cisco Systems, Inc.
-# All rights reserved.
-#
-#    Licensed under the Apache License, Version 2.0 (the "License"); you may
-#    not use this file except in compliance with the License. You may obtain
-#    a copy of the License at
-#
-#         http://www.apache.org/licenses/LICENSE-2.0
-#
-#    Unless required by applicable law or agreed to in writing, software
-#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
-#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-#    License for the specific language governing permissions and limitations
-#    under the License.
-
-echo "Please makesure you have installed docker and can run as no-root user"
-echo "if yes, please press Enter..."
-read
-
-# try to stop running containers
-docker kill `docker ps | grep mongo | awk '{print $1}'`
-docker kill `docker ps | grep rabbit | awk '{print $1}'`
-
-# clean containers
-docker rm `docker ps -a | awk '{print $1}'`
-
-
-# for rabbitmq
-echo "Starting rabbitmq..."
-docker run -d -p 5672:5672 -p 15672:15672 -e RABBITMQ_PASS="admin" tutum/rabbitmq
-
-# for mongodb
-echo "starting mongodb replica set"
-
-cd ~
-for ((i=1; i<4; i++)); do
-    if ! [ -d data/mongo/node$i ]; then
-        mkdir -p data/mongo/node$i
-    fi
-done
-
-SCRIPTPATH=`pwd -P`
-
-docker run -p 27017:27017 -p 27018:27018 -p 27019:27019 -d \
-    -v /host/primary:$SCRIPTPATH/data/mongo/node1 -v /host/secondary:$SCRIPTPATH/data/mongo/node2 \
-    tattsun/mongodb-replset
-
-sleep 30
-
-echo "init mongodb replca set"
-
-mongo admin --eval "rs.initiate()"
-
-mongo_host_id=`docker ps | grep mongo | awk '{print $1}'`
-
-mongo admin --eval "rs.add(\"$mongo_host_id:27018\")"
-
-mongo admin --eval "rs.add(\"$mongo_host_id:27019\")"
diff --git a/tox.ini b/tox.ini
deleted file mode 100644
index d7ca90ef..00000000
--- a/tox.ini
+++ /dev/null
@@ -1,53 +0,0 @@
-# Tox (http://tox.testrun.org/) is a tool for running tests
-# in multiple virtualenvs. This configuration file will run the
-# test suite on all supported python versions. To use it, "pip install tox"
-# and then run "tox" from this directory.
-
-[tox]
-# List the environment that will be run by default
-minversion = 1.6
-envlist = py27,py36,docs,pep8
-skipsdist = True
-
-[testenv]
-setenv = VIRTUAL_ENV={envdir}
-         LANG=en_US.UTF-8
-         LANGUAGE=en_US:en
-         LC_ALL=C
-deps = -r{toxinidir}/requirements.txt
-       -r{toxinidir}/test-requirements.txt
-
-[testenv:py27]
-commands = coverage erase
-           coverage run run_test.py
-           coverage report -m
-[testenv:py36]
-commands = coverage erase
-           coverage run run_test.py
-           coverage report -m
-
-[testenv:docs]
-deps=
-    sphinx==1.5.5
-    sphinx_rtd_theme
-    sphinxcontrib-httpdomain==1.1.7
-    -r{toxinidir}/requirements.txt
-commands = sphinx-build -W -b html doc/source doc/build
-
-[testenv:pep8]
-sitepackages = False
-commands =
-    flake8 {posargs}
-
-[flake8]
-# E712 is ignored on purpose, since it is normal to use 'column == true'
-# in sqlalchemy.
-# H803 skipped on purpose per list discussion.
-# E125 is deliberately excluded. See https://github.com/jcrocholl/pep8/issues/126
-# The rest of the ignores are TODOs
-# New from hacking 0.9: E129, E131, E265, E713, H407, H405, H904
-# Stricter in hacking 0.9: F402
-# E251 Skipped due to https://github.com/jcrocholl/pep8/issues/301
-
-max-line-length=120
-exclude = .venv,.git,.tox,dist,doc,*lib/python*,*egg,build,tools
diff --git a/uv.lock b/uv.lock
new file mode 100644
index 00000000..26b0fb12
--- /dev/null
+++ b/uv.lock
@@ -0,0 +1,934 @@
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+    { url = "https://files.pythonhosted.org/packages/f6/d5/ca60c8b404b303d9490e1417430a5198a77557dbeb17c1cb31616e432318/zope_interface-8.4-cp314-cp314-macosx_10_9_x86_64.whl", hash = "sha256:7cbb887fdbfaacb4c362dbb487033551646e28013ad5ffe72e96eb260003a1a1", size = 212012, upload-time = "2026-04-25T07:28:36.88Z" },
+    { url = "https://files.pythonhosted.org/packages/83/64/6bb9f54250c817e24b39e986f173b6cd21ff658bec6c6cc0baad05d761e4/zope_interface-8.4-cp314-cp314-macosx_11_0_arm64.whl", hash = "sha256:a5638c6be715116d3453e6d099c299c6844d54810de7445ce116424e905ede06", size = 212071, upload-time = "2026-04-25T07:28:38.742Z" },
+    { url = "https://files.pythonhosted.org/packages/c6/cf/42851262e102723058019dc7d0b48210b85a935f79ae32ce60ddccc2e8fb/zope_interface-8.4-cp314-cp314-manylinux1_i686.manylinux2014_i686.manylinux_2_17_i686.manylinux_2_5_i686.whl", hash = "sha256:b8147b40bfcd53803870a9519e0879ff066aeecc2fcff8295663c1b17fc38dc2", size = 266075, upload-time = "2026-04-25T07:28:41.084Z" },
+    { url = "https://files.pythonhosted.org/packages/d2/a7/e48c79b836f6f0a2c219288e2ec343517f90e95c93de5435a8a23918bf20/zope_interface-8.4-cp314-cp314-manylinux1_x86_64.manylinux2014_x86_64.manylinux_2_17_x86_64.manylinux_2_5_x86_64.whl", hash = "sha256:049ba3c7b38cc400ae08e011617635706e0f442e1d075db1b015246fcbf6091e", size = 269127, upload-time = "2026-04-25T07:28:42.868Z" },
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+    { url = "https://files.pythonhosted.org/packages/91/d5/20310601450367fc35fa28b0544c98d0347b8cc25eaf106a2c4cc36841e1/zope_interface-8.4-cp314-cp314-win_amd64.whl", hash = "sha256:4713bf651ec36e7eea49d2ace4f0e89bec2b33a339674874b1121f2537edc62a", size = 215199, upload-time = "2026-04-25T07:28:47.146Z" },
+    { url = "https://files.pythonhosted.org/packages/5b/00/0d22ce75126e31f81baa5889e2a40aad37c8e34d1220cf8b18d744f2b5d9/zope_interface-8.4-cp314-cp314-win_arm64.whl", hash = "sha256:d934497c4b72d5f528d2b5ebe9b8b5a7004b5877948ebd4ea00c2432fb27178f", size = 213178, upload-time = "2026-04-25T07:28:48.868Z" },
+]
diff --git a/yabgp/__init__.py b/yabgp/__init__.py
index 71d2401f..eddbd9a8 100644
--- a/yabgp/__init__.py
+++ b/yabgp/__init__.py
@@ -15,4 +15,5 @@
 
 """version information"""
 
-version = '0.9.0.dev0'
+__version__ = '1.0'
+version = __version__
diff --git a/yabgp/agent/__init__.py b/yabgp/agent/__init__.py
index caa0473d..bd712882 100644
--- a/yabgp/agent/__init__.py
+++ b/yabgp/agent/__init__.py
@@ -13,9 +13,9 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import sys
-import os
 import logging
+import os
+import sys
 import traceback
 
 from oslo_config import cfg
@@ -23,14 +23,13 @@
 from twisted.web.server import Site
 from twisted.web.wsgi import WSGIResource
 
-from yabgp import version, log
-from yabgp.core.factory import BGPPeering
-from yabgp.config import get_bgp_config
-from yabgp.common import constants as bgp_cons
+from yabgp import log, version
 from yabgp.api.app import app
+from yabgp.common import constants as bgp_cons
+from yabgp.config import get_bgp_config
+from yabgp.core.factory import BGPPeering
 from yabgp.handler.default_handler import DefaultHandler
 
-
 log.early_init_log(logging.DEBUG)
 
 CONF = cfg.CONF
diff --git a/yabgp/agent/cmd.py b/yabgp/agent/cmd.py
index 3db08c28..32c0bd13 100644
--- a/yabgp/agent/cmd.py
+++ b/yabgp/agent/cmd.py
@@ -15,7 +15,6 @@
 
 """start service"""
 
-from __future__ import print_function
 from yabgp.agent import prepare_service
 
 
diff --git a/yabgp/api/app.py b/yabgp/api/app.py
index f3fd56d4..69e316aa 100644
--- a/yabgp/api/app.py
+++ b/yabgp/api/app.py
@@ -17,11 +17,10 @@
 """
 
 import flask
-
-from yabgp.api import v1
-from yabgp.api import config
 from oslo_config import cfg
 
+from yabgp.api import config, v1
+
 app = flask.Flask('yabgp.api')
 app.config['SECRET_KEY'] = 'cisco123'
 app.register_blueprint(v1.blueprint, url_prefix='/v1')
@@ -81,4 +80,4 @@ def version_descriptor(base_url, version):
 
 
 def version_url(base_url, version_number):
-    return '%s/%s' % (base_url, version_number)
+    return f'{base_url}/{version_number}'
diff --git a/yabgp/api/config.py b/yabgp/api/config.py
index 5b476d72..ba12a1b5 100644
--- a/yabgp/api/config.py
+++ b/yabgp/api/config.py
@@ -15,7 +15,6 @@
 
 from oslo_config import cfg
 
-
 CONF = cfg.CONF
 
 rest_server_ops = [
diff --git a/yabgp/api/utils.py b/yabgp/api/utils.py
index 7e518324..90290a11 100644
--- a/yabgp/api/utils.py
+++ b/yabgp/api/utils.py
@@ -13,13 +13,13 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import time
 import logging
+import time
 from functools import wraps
 
-from oslo_config import cfg
-from flask import request
 import flask
+from flask import request
+from oslo_config import cfg
 
 from yabgp.common import constants as common_cons
 
@@ -136,7 +136,7 @@ def send_route_refresh(peer_ip, afi, safi, res):
         else:
             return {
                 'status': False,
-                'code': 'address family unsupported, afi=%s,safi=%s' % (afi, safi)
+                'code': f'address family unsupported, afi={afi},safi={safi}'
             }
     except Exception as e:
         LOG.error(e)
diff --git a/yabgp/api/v1.py b/yabgp/api/v1.py
index 802f9c8b..99c1bc71 100644
--- a/yabgp/api/v1.py
+++ b/yabgp/api/v1.py
@@ -1,5 +1,4 @@
 #!/usr/bin/env python
-# -*- coding:utf-8 -*-
 
 # Copyright 2015 Cisco Systems, Inc.
 # All rights reserved.
@@ -20,12 +19,12 @@
 """
 import binascii
 import logging
-import time
 import re
+import time
 
-from flask_httpauth import HTTPBasicAuth
-from flask import Blueprint, request
 import flask
+from flask import Blueprint, request
+from flask_httpauth import HTTPBasicAuth
 from oslo_config import cfg
 
 from yabgp.api import utils as api_utils
@@ -218,7 +217,7 @@ def send_update_message(peer_ip):
                     else:
                         return flask.jsonify({
                             'status': False,
-                            'code': 'unexpected extended community "%s", please check your post data' % key
+                            'code': f'unexpected extended community "{key}", please check your post data'
                         })
             attr[16] = ext_community
     if cfg.CONF.bgp.rib:
@@ -394,7 +393,7 @@ def json_to_bin(peer_ip):
                     else:
                         return flask.jsonify({
                             'status': False,
-                            'code': 'unexpected extended community "%s", please check your post data' % key
+                            'code': f'unexpected extended community "{key}", please check your post data'
                         })
             attr[16] = ext_community
     if (attr and nlri) or withdraw:
diff --git a/yabgp/common/constants.py b/yabgp/common/constants.py
index 7a379559..ce631026 100644
--- a/yabgp/common/constants.py
+++ b/yabgp/common/constants.py
@@ -528,7 +528,7 @@
 }
 
 WELL_KNOW_COMMUNITY_STR_2_INT = dict(
-    [(r, l) for (l, r) in WELL_KNOW_COMMUNITY_INT_2_STR.items()])
+    [(r, label) for (label, r) in WELL_KNOW_COMMUNITY_INT_2_STR.items()])
 
 TCP_MD5SIG_MAXKEYLEN = 80
 SS_PADSIZE_IPV4 = 120
diff --git a/yabgp/common/exception.py b/yabgp/common/exception.py
index 1bd83c49..fd6a75ea 100644
--- a/yabgp/common/exception.py
+++ b/yabgp/common/exception.py
@@ -25,14 +25,14 @@ class BGPException(Exception):
 
     def __init__(self, **kwargs):
         try:
-            super(BGPException, self).__init__(self.message % kwargs)
+            super().__init__(self.message % kwargs)
             self.msg = self.message % kwargs
         except Exception:
             if _FATAL_EXCEPTION_FORMAT_ERRORS:
                 raise
             else:
                 # at least get the core message out if something happened
-                super(BGPException, self).__init__(self.message)
+                super().__init__(self.message)
 
     def __unicode__(self):
         return self.msg.decode('utf8', 'ignore')
@@ -50,13 +50,13 @@ def __init__(self, sub_error, data=''):
             self.msg = self.message % {'sub_error': sub_error, 'data': data}
             self.sub_error = sub_error
             self.data = data
-            super(NotificationSent, self).__init__(self.msg)
+            super().__init__(self.msg)
         except Exception:
             if _FATAL_EXCEPTION_FORMAT_ERRORS:
                 raise
             else:
                 # at least get the core message out if something happened
-                super(NotificationSent, self).__init__(self.message)
+                super().__init__(self.message)
 
     def __unicode__(self):
         return self.msg.decode('utf8', 'ignore')
@@ -78,7 +78,7 @@ class UpdateMessageError(NotificationSent):
     message = "BGP Update Message Error, sub error:%(sub_error)s, data:%(data)s"
 
     def __init__(self, sub_error, data='', sub_results=None):
-        super(UpdateMessageError, self).__init__(sub_error, data)
+        super().__init__(sub_error, data)
         self.sub_results = sub_results
 
 
diff --git a/yabgp/common/tlv.py b/yabgp/common/tlv.py
index fb93200a..a58634e3 100644
--- a/yabgp/common/tlv.py
+++ b/yabgp/common/tlv.py
@@ -16,7 +16,7 @@
 import binascii
 
 
-class TLV(object):
+class TLV:
     """TLV basic class
     """
     TYPE = -1
@@ -26,7 +26,7 @@ def __init__(self, value):
         self.value = value
 
     def __str__(self):
-        return '%s: %s' % (self.TYPE_STR, self.value)
+        return f'{self.TYPE_STR}: {self.value}'
 
     @classmethod
     def parse(cls, value, typecode=-1):
diff --git a/yabgp/config.py b/yabgp/config.py
index 09c0dd93..8c287e8d 100644
--- a/yabgp/config.py
+++ b/yabgp/config.py
@@ -20,8 +20,7 @@
 
 from oslo_config import cfg
 
-from yabgp.common.constants import AFI_SAFI_STR_DICT
-from yabgp.common.constants import AFI_STR_DICT
+from yabgp.common.constants import AFI_SAFI_STR_DICT, AFI_STR_DICT
 
 CONF = cfg.CONF
 
diff --git a/yabgp/core/factory.py b/yabgp/core/factory.py
index b0167ad3..c239dcd2 100644
--- a/yabgp/core/factory.py
+++ b/yabgp/core/factory.py
@@ -17,20 +17,19 @@
 """
 
 import logging
-import socket
 import platform
+import socket
 import struct
 import sys
 
 import netaddr
-from twisted.internet import protocol
-from twisted.internet import reactor
 from oslo_config import cfg
+from twisted.internet import protocol, reactor
 
-from yabgp.core.protocol import BGP
-from yabgp.core.fsm import FSM
 from yabgp.common import constants as bgp_cons
 from yabgp.common.afn import AFNUM_INET
+from yabgp.core.fsm import FSM
+from yabgp.core.protocol import BGP
 
 LOG = logging.getLogger(__name__)
 
@@ -101,7 +100,6 @@ def __init__(self, myasn=None, myaddr=None, peerasn=None, peeraddr=None,
         self.estab_protocol = None
 
     def buildProtocol(self, addr):
-
         """Builds a BGP protocol instance
 
         :param addr: IP address used for building protocol.
@@ -115,7 +113,6 @@ def buildProtocol(self, addr):
         return p
 
     def _initProtocol(self, protocol, addr):
-
         """Initializes a BGPProtocol instance
 
         :param protocol: twisted Protocol
@@ -134,14 +131,13 @@ def _initProtocol(self, protocol, addr):
             protocol.fsm.state = bgp_cons.ST_ACTIVE
 
     def clientConnectionFailed(self, connector, reason):
-
         """Called when the outgoing connection failed.
 
         :param connector: Twisted connector
         :param reason: connection failed reason
         """
 
-        error_msg = "[%s]Client connection failed: %s" % (self.peer_addr, reason.getErrorMessage())
+        error_msg = f"[{self.peer_addr}]Client connection failed: {reason.getErrorMessage()}"
         self.handler.on_connection_failed(self.peer_addr, reason.getErrorMessage())
         LOG.info(error_msg)
         # There is no protocol instance yet at this point.
@@ -152,7 +148,6 @@ def clientConnectionFailed(self, connector, reason):
             LOG.info("[%s]Client connection failed: %s", self.peer_addr, e)
 
     def automatic_start(self, idle_hold=False):
-
         """BGP AutomaticStart event (event 3)
 
         :param idle_hold: flag represents used Idle Hold
@@ -175,7 +170,6 @@ def manual_start(self, idle_hold=False):
             return False
 
     def manual_stop(self):
-
         """BGP ManualStop event (event 2) Returns a DeferredList that
         will fire once the connection(s) have closed"""
 
@@ -202,7 +196,6 @@ def connection_closed(self, pro, disconnect=False):
             self.automatic_start(idle_hold=True)
 
     def connect_retry(self):
-
         """Called by FSM when we should reattempt to connect.
         """
         try:
@@ -231,7 +224,6 @@ def set_peer_id(self, bgp_id):
             self.peer_id = None
 
     def connect(self):
-
         """Initiates a TCP client connection to the peer. Should only be called from
         BGPPeering or FSM, otherwise use manualStart() instead.
         """
@@ -281,13 +273,12 @@ def get_tcp_md5sig(md5_str, host, port):
             n_port = socket.htons(port)
             if afi == AFNUM_INET:
                 n_addr = socket.inet_pton(socket.AF_INET, host)
-                tcp_md5sig = 'HH4s%dx2xH4x%ds' % (
-                    bgp_cons.SS_PADSIZE_IPV4, bgp_cons.TCP_MD5SIG_MAXKEYLEN)
+                tcp_md5sig = f'HH4s{bgp_cons.SS_PADSIZE_IPV4}x2xH4x{bgp_cons.TCP_MD5SIG_MAXKEYLEN}s'
                 md5sig = struct.pack(
                     tcp_md5sig, socket.AF_INET, n_port, n_addr, len(md5_str), md5_str.encode())
                 return md5sig
             else:
                 return None
-        except socket.error as e:
+        except OSError as e:
             LOG.error('This linux machine does not support TCP_MD5SIG: (%s)', str(e))
             return None
diff --git a/yabgp/core/fsm.py b/yabgp/core/fsm.py
index e57b9be0..a601c3a1 100644
--- a/yabgp/core/fsm.py
+++ b/yabgp/core/fsm.py
@@ -14,19 +14,20 @@
 
 """BGP FMS Implementation"""
 
-import time
 import logging
+import time
 
 from oslo_config import cfg
-from yabgp.core.timer import BGPTimer
+
 from yabgp.common import constants as bgp_cons
+from yabgp.core.timer import BGPTimer
 
 CONF = cfg.CONF
 
 LOG = logging.getLogger(__name__)
 
 
-class FSM(object):
+class FSM:
 
     """
     Implements BGP Events described in section 8.1 of RFC 4271
@@ -79,7 +80,7 @@ def __setattr__(self, name, value):
             if value == bgp_cons.ST_ESTABLISHED:
                 self.uptime = time.time()
                 self.bgp_peering.handler.on_established(peer=self.bgp_peering.peer_addr, msg=self.uptime)
-        super(FSM, self).__setattr__(name, value)
+        super().__setattr__(name, value)
 
     def manual_start(self, idle_hold=False):
 
diff --git a/yabgp/core/protocol.py b/yabgp/core/protocol.py
index a7b5a7ea..58c51870 100644
--- a/yabgp/core/protocol.py
+++ b/yabgp/core/protocol.py
@@ -15,25 +15,24 @@
 
 """BGP Protocol"""
 
+import copy
 import logging
-import traceback
 import struct
 import time
+import traceback
 
 import netaddr
 from oslo_config import cfg
-from twisted.internet import protocol
-from twisted.internet import reactor
 from radix import Radix
-import copy
+from twisted.internet import protocol, reactor
 
 from yabgp.common import constants as bgp_cons
-from yabgp.message.open import Open
+from yabgp.common import exception as excep
 from yabgp.message.keepalive import KeepAlive
-from yabgp.message.update import Update
 from yabgp.message.notification import Notification
+from yabgp.message.open import Open
 from yabgp.message.route_refresh import RouteRefresh
-from yabgp.common import exception as excep
+from yabgp.message.update import Update
 
 LOG = logging.getLogger(__name__)
 
@@ -44,7 +43,6 @@ class BGP(protocol.Protocol):
     """Protocol class for BGP 4"""
 
     def __init__(self):
-
         """Create a BGP protocol.
         """
         self.fsm = None
@@ -105,7 +103,6 @@ def init_rib(self):
         self.adj_rib_out = {k: {} for k in CONF.bgp.afi_safi}
 
     def connectionMade(self):
-
         """
         Starts the initial negotiation of the protocol
         """
@@ -260,7 +257,6 @@ def _update_received(self, timestamp, msg):
         # if self.msg_recv_stat['Updates'] % 1000 == 0:
         #     LOG.info(self.msg_recv_stat['Updates'])
         #     LOG.info(time.time())
-
         """Called when a BGP Update message was received."""
         # TODO: Need to convert `self.add_path_ipv4_receive` and `self.add_path_ipv4_send` into a unified
         #  `afi_add_path` format.
@@ -573,7 +569,6 @@ def _route_refresh_received(self, msg, msg_type):
         self.handler.route_refresh_received(self, nofi_msg, msg_type)
 
     def negotiate_hold_time(self, hold_time):
-
         """Negotiates the hold time"""
 
         self.fsm.hold_time = min(self.fsm.hold_time, hold_time)
@@ -731,7 +726,7 @@ def update_send_version(self, peer_ip, attr, nlri, withdraw):
                         self.send_version['flowspec'] += 1
                         del self.flowspec_send_dict[str(key)]
                     else:
-                        LOG.info("Do not have %s in send flowspec dict" % key)
+                        LOG.info(f"Do not have {key} in send flowspec dict")
             elif attr[15]['afi_safi'] == [1, 73]:
                 LOG.info('withdraw sr')
                 key = "{"
@@ -746,7 +741,7 @@ def update_send_version(self, peer_ip, attr, nlri, withdraw):
                     self.send_version['sr_policy'] += 1
                     del self.sr_send_dict[str(key)]
                 else:
-                    LOG.info("Do not have %s in send flowspec dict" % key)
+                    LOG.info(f"Do not have {key} in send flowspec dict")
             elif attr[15]['afi_safi'] == [1, 128]:
                 LOG.info("withdraw mpls_vpn")
                 for prefix in attr[15]['withdraw']:
@@ -762,7 +757,7 @@ def update_send_version(self, peer_ip, attr, nlri, withdraw):
                         self.send_version['mpls_vpn'] += 1
                         del self.mpls_vpn_send_dict[str(key)]
                     else:
-                        LOG.info("Do not have %s in send flowspec dict" % key)
+                        LOG.info(f"Do not have {key} in send flowspec dict")
 
     def update_receive_verion(self, attr, nlri, withdraw):
         if 14 in attr:
@@ -831,7 +826,7 @@ def update_receive_verion(self, attr, nlri, withdraw):
                         self.receive_version['flowspec'] += 1
                         del self.flowspec_receive_dict[str(key)]
                     else:
-                        LOG.info("Do not have %s in receive flowspec dict" % prefix)
+                        LOG.info(f"Do not have {prefix} in receive flowspec dict")
             elif attr[15]['afi_safi'] == [1, 73]:
                 LOG.info('recieve sr withdraw')
             elif attr[15]['afi_safi'] == [1, 128]:
@@ -849,7 +844,7 @@ def update_receive_verion(self, attr, nlri, withdraw):
                         self.receive_version['mpls_vpn'] += 1
                         del self.mpls_vpn_receive_dict[str(key)]
                     else:
-                        LOG.info("Do not have %s in receive mpls_vpn dict" % key)
+                        LOG.info(f"Do not have {key} in receive mpls_vpn dict")
 
     def compare_add_path(self, local_add_path, remote_add_path):
         if not local_add_path or not remote_add_path:
diff --git a/yabgp/core/timer.py b/yabgp/core/timer.py
index 5ed6394f..30282258 100644
--- a/yabgp/core/timer.py
+++ b/yabgp/core/timer.py
@@ -15,10 +15,10 @@
 """ BGP Timer"""
 
 # Twisted modules
-from twisted.internet import reactor, error
+from twisted.internet import error, reactor
 
 
-class BGPTimer(object):
+class BGPTimer:
     """
     Timer class with a slightly different Timer interface than the
     Twisted DelayedCall interface
diff --git a/yabgp/handler/__init__.py b/yabgp/handler/__init__.py
index dc6984cf..80b68cac 100644
--- a/yabgp/handler/__init__.py
+++ b/yabgp/handler/__init__.py
@@ -1,15 +1,12 @@
 #!/usr/bin/python
-# -*- coding: utf-8 -*-
 import abc
 import logging
 from queue import Queue
 
-
 LOG = logging.getLogger(__name__)
 
 
-class BaseHandler(object):
-    __metaclass__ = abc.ABCMeta
+class BaseHandler(metaclass=abc.ABCMeta):
 
     def __init__(self):
         """
@@ -22,44 +19,44 @@ def __init__(self):
 
     @abc.abstractmethod
     def init(self):
-        raise NotImplemented
+        raise NotImplementedError
 
     @abc.abstractmethod
     def on_update_error(self, peer, timestamp, msg):
-        raise NotImplemented
+        raise NotImplementedError
 
     @abc.abstractmethod
     def update_received(self, peer, timestamp, msg):
-        raise NotImplemented
+        raise NotImplementedError
 
     @abc.abstractmethod
     def keepalive_received(self, peer, timestamp):
-        raise NotImplemented
+        raise NotImplementedError
 
     @abc.abstractmethod
     def open_received(self, peer, timestamp, result):
-        raise NotImplemented
+        raise NotImplementedError
 
     @abc.abstractmethod
     def send_open(self, peer, timestamp, result):
-        raise NotImplemented
+        raise NotImplementedError
 
     @abc.abstractmethod
     def route_refresh_received(self, peer, msg, msg_type):
-        raise NotImplemented
+        raise NotImplementedError
 
     @abc.abstractmethod
     def notification_received(self, peer, msg):
-        raise NotImplemented
+        raise NotImplementedError
 
     @abc.abstractmethod
     def on_connection_lost(self, peer):
-        raise NotImplemented
+        raise NotImplementedError
 
     @abc.abstractmethod
     def on_connection_failed(self, peer, msg):
-        raise NotImplemented
+        raise NotImplementedError
 
     @abc.abstractmethod
     def on_established(self, peer, msg):
-        raise NotImplemented
+        raise NotImplementedError
diff --git a/yabgp/handler/default_handler.py b/yabgp/handler/default_handler.py
index 52880448..c1265925 100644
--- a/yabgp/handler/default_handler.py
+++ b/yabgp/handler/default_handler.py
@@ -1,16 +1,14 @@
 #!/usr/bin/python
-# -*- coding: utf-8 -*-
 
 # import json
 # replace with simplejson
-import simplejson as json
-
+import logging
 import os
+import sys
 import time
-import logging
 import traceback
-import sys
 
+import simplejson as json
 from oslo_config import cfg
 
 from yabgp.common import constants as bgp_cons
@@ -41,7 +39,7 @@
 
 class DefaultHandler(BaseHandler):
     def __init__(self):
-        super(DefaultHandler, self).__init__()
+        super().__init__()
         '''
             {<peer>: (<path>, <current file>)}
         '''
@@ -74,7 +72,7 @@ def init_msg_file(self, peer_addr):
             last_msg_seq, msg_file_name = DefaultHandler.get_last_seq_and_file(msg_path)
 
             if not msg_file_name:
-                msg_file_name = "%s.msg" % time.time()
+                msg_file_name = f"{time.time()}.msg"
             # store the message sequence
             self.msg_sequence[peer_addr] = last_msg_seq + 1
             msg_file = open(os.path.join(msg_path, msg_file_name), 'a')
@@ -97,7 +95,7 @@ def get_last_seq_and_file(msg_path):
         file_list.sort()
         msg_file_name = file_list[-1]
         try:
-            with open(msg_path + msg_file_name, 'r') as fh:
+            with open(msg_path + msg_file_name) as fh:
                 line = None
                 for line in fh:
                     pass
@@ -154,7 +152,7 @@ def check_file_size(self, peer):
         if msg_path:
             if os.path.getsize(cur_file.name) >= CONF.message.write_msg_max_size:
                 cur_file.close()
-                msg_file_name = "%s.msg" % time.time()
+                msg_file_name = f"{time.time()}.msg"
                 LOG.info('Open a new message file %s', msg_file_name)
                 msg_file = open(os.path.join(msg_path + msg_file_name), 'a')
                 self.peer_files[peer.lower()] = (msg_path, msg_file)
diff --git a/yabgp/hooks.py b/yabgp/hooks.py
deleted file mode 100644
index bb862842..00000000
--- a/yabgp/hooks.py
+++ /dev/null
@@ -1,70 +0,0 @@
-# Copyright 2015 Cisco Systems, Inc.
-# All rights reserved.
-#
-#    Licensed under the Apache License, Version 2.0 (the "License"); you may
-#    not use this file except in compliance with the License. You may obtain
-#    a copy of the License at
-#
-#         http://www.apache.org/licenses/LICENSE-2.0
-#
-#    Unless required by applicable law or agreed to in writing, software
-#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
-#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-#    License for the specific language governing permissions and limitations
-#    under the License.
-
-# copy from # get from https://github.com/osrg/ryu/blob/master/ryu/hooks.py
-import sys
-from setuptools.command import easy_install
-
-from yabgp import version
-
-
-# Global variables in this module doesn't work as we expect
-# because, during the setup procedure, this module seems to be
-# copied (as a file) and can be loaded multiple times.
-# We save them into __main__ module instead.
-def _main_module():
-    return sys.modules['__main__']
-
-
-def save_orig():
-    """Save original easy_install.get_script_args.
-    This is necessary because pbr's setup_hook is sometimes called
-    before ours."""
-    _main_module()._orig_get_script_args = easy_install.get_script_args
-
-
-def setup_hook(config):
-    """Filter config parsed from a setup.cfg to inject our defaults."""
-    metadata = config['metadata']
-    requires = metadata.get('requires_dist', '').split('\n')
-    if sys.platform == 'win32':
-        requires.append('pywin32')
-        requires.append('wmi')
-    metadata['requires_dist'] = "\n".join(requires)
-    config['metadata'] = metadata
-    metadata['version'] = str(version)
-
-    # pbr's setup_hook replaces easy_install.get_script_args with
-    # their own version, override_get_script_args, prefering simpler
-    # scripts which are not aware of multi-version.
-    # prevent that by doing the opposite.  it's a horrible hack
-    # but we are in patching wars already...
-    from pbr import packaging
-
-    def my_get_script_args(*args, **kwargs):
-        return _main_module()._orig_get_script_args(*args, **kwargs)
-
-    packaging.override_get_script_args = my_get_script_args
-    easy_install.get_script_args = my_get_script_args
-
-    # another hack to allow setup from tarball.
-    orig_get_version = packaging.get_version
-
-    def my_get_version(package_name, pre_version=None):
-        if package_name == 'yabgp':
-            return str(version)
-        return orig_get_version(package_name, pre_version)
-
-    packaging.get_version = my_get_version
diff --git a/yabgp/log.py b/yabgp/log.py
index 18f60666..42ecfe45 100644
--- a/yabgp/log.py
+++ b/yabgp/log.py
@@ -16,21 +16,16 @@
 """ logging handler. Reference from https://github.com/osrg/ryu/blob/master/ryu/log.py
 """
 
-from __future__ import print_function
 import inspect
 import logging
 import logging.config
 import logging.handlers
 import os
 import sys
-if sys.version_info[0] == 2:
-    import ConfigParser
-elif sys.version_info[0] == 3:
-    from configparser import ConfigParser
+from configparser import ConfigParser
 
 from oslo_config import cfg
 
-
 CONF = cfg.CONF
 
 CONF.register_cli_opts([
@@ -93,7 +88,7 @@ def init_log():
                 for handler in log.handlers:
                     handler.setFormatter(logging.Formatter(DEBUG_LOG_FORMAT))
         except ConfigParser.Error as e:
-            print('Failed to parse %s: %s' % (CONF.log_config_file, e),
+            print(f'Failed to parse {CONF.log_config_file}: {e}',
                   file=sys.stderr)
             sys.exit(2)
         return
diff --git a/yabgp/message/attribute/__init__.py b/yabgp/message/attribute/__init__.py
index f8b5cdff..ae3edf18 100644
--- a/yabgp/message/attribute/__init__.py
+++ b/yabgp/message/attribute/__init__.py
@@ -68,7 +68,7 @@ def __str_(self):
             r.append("OPTIONAL_TRANSITIVE")
             v -= 0xc0
         if v:
-            r.append("UNKNOWN %s" % hex(v))
+            r.append(f"UNKNOWN {hex(v)}")
         return " ".join(r)
 
 
@@ -155,10 +155,10 @@ def __str__(self):
             return "LARGE_COMMUNITY"
         if self == 0xffff:
             return "INTERNAL SPLIT"
-        return 'UNKNOWN ATTRIBUTE (%s)' % hex(self)
+        return f'UNKNOWN ATTRIBUTE ({hex(self)})'
 
 
-class Attribute(object):
+class Attribute:
     """
     Base class for all BGP attribute classes
     Attribute instances are (meant to be) immutable once initialized
@@ -177,7 +177,7 @@ def _attribute(self, value):
             len_value = pack('!H', length)[0]
         else:
             len_value = chr(length)
-        return "%s%s%s%s" % (chr(flag), chr(self.ID), len_value, value)
+        return f"{chr(flag)}{chr(self.ID)}{len_value}{value}"
 
     def __eq__(self, other):
         return self.ID == other.ID
diff --git a/yabgp/message/attribute/aggregator.py b/yabgp/message/attribute/aggregator.py
index eaa8d210..dfececd0 100644
--- a/yabgp/message/attribute/aggregator.py
+++ b/yabgp/message/attribute/aggregator.py
@@ -17,11 +17,9 @@
 
 import netaddr
 
-from yabgp.message.attribute import Attribute
-from yabgp.message.attribute import AttributeID
-from yabgp.message.attribute import AttributeFlag
 from yabgp.common import constants as bgp_cons
 from yabgp.common import exception as excep
+from yabgp.message.attribute import Attribute, AttributeFlag, AttributeID
 
 
 class Aggregator(Attribute):
diff --git a/yabgp/message/attribute/aspath.py b/yabgp/message/attribute/aspath.py
index 396ac7be..779084c6 100644
--- a/yabgp/message/attribute/aspath.py
+++ b/yabgp/message/attribute/aspath.py
@@ -15,11 +15,9 @@
 
 import struct
 
-from yabgp.message.attribute import Attribute
-from yabgp.message.attribute import AttributeID
-from yabgp.message.attribute import AttributeFlag
-from yabgp.common import exception as excep
 from yabgp.common import constants as bgp_cons
+from yabgp.common import exception as excep
+from yabgp.message.attribute import Attribute, AttributeFlag, AttributeID
 
 
 class ASPath(Attribute):
@@ -58,11 +56,10 @@ class ASPath(Attribute):
 
     @classmethod
     def parse(cls, value, asn4=False):
-
         """
         Parse AS PATH attributes.
         :param asn4: 4 bytes asn or not
-        :param value: raw binary balue
+        :param value: raw binary value
         """
         aspath = []
         offset = 0
@@ -101,7 +98,7 @@ def parse(cls, value, asn4=False):
                     sub_error=bgp_cons.ERR_MSG_UPDATE_ATTR_LEN,
                     data='')
 
-            fmt = '!%d%s' % (num_ases, asn_fmt_char)
+            fmt = f'!{num_ases}{asn_fmt_char}'
             segment = list(struct.unpack_from(fmt, value, offset))
 
             aspath.append((seg_type, segment))
@@ -111,7 +108,6 @@ def parse(cls, value, asn4=False):
 
     @classmethod
     def construct(cls, value, asn4=False):
-
         """
         Construct AS PATH.
         :param asn4: 4byte asn
diff --git a/yabgp/message/attribute/atomicaggregate.py b/yabgp/message/attribute/atomicaggregate.py
index 8cfe32d7..3f813ae0 100644
--- a/yabgp/message/attribute/atomicaggregate.py
+++ b/yabgp/message/attribute/atomicaggregate.py
@@ -15,11 +15,9 @@
 
 import struct
 
-from yabgp.message.attribute import Attribute
-from yabgp.message.attribute import AttributeID
-from yabgp.message.attribute import AttributeFlag
 from yabgp.common import constants as bgp_cons
 from yabgp.common import exception as excep
+from yabgp.message.attribute import Attribute, AttributeFlag, AttributeID
 
 
 class AtomicAggregate(Attribute):
diff --git a/yabgp/message/attribute/clusterlist.py b/yabgp/message/attribute/clusterlist.py
index df6de39b..74ccd274 100644
--- a/yabgp/message/attribute/clusterlist.py
+++ b/yabgp/message/attribute/clusterlist.py
@@ -17,11 +17,9 @@
 
 import netaddr
 
-from yabgp.message.attribute import Attribute
-from yabgp.message.attribute import AttributeID
-from yabgp.message.attribute import AttributeFlag
 from yabgp.common import constants as bgp_cons
 from yabgp.common import exception as excep
+from yabgp.message.attribute import Attribute, AttributeFlag, AttributeID
 
 
 class ClusterList(Attribute):
diff --git a/yabgp/message/attribute/community.py b/yabgp/message/attribute/community.py
index 9b66711d..b5c5823e 100644
--- a/yabgp/message/attribute/community.py
+++ b/yabgp/message/attribute/community.py
@@ -15,11 +15,9 @@
 
 import struct
 
-from yabgp.message.attribute import Attribute
-from yabgp.message.attribute import AttributeID
-from yabgp.message.attribute import AttributeFlag
-from yabgp.common import exception as excep
 from yabgp.common import constants as bgp_cons
+from yabgp.common import exception as excep
+from yabgp.message.attribute import Attribute, AttributeFlag, AttributeID
 
 
 class Community(Attribute):
@@ -45,14 +43,14 @@ def parse(cls, value):
         community = []
         if value:
             try:
-                length = len(value) / 2
-                value_list = list(struct.unpack('!%dH' % length, value))
+                length = len(value) // 2
+                value_list = list(struct.unpack(f'!{length}H', value))
                 while value_list:
                     value_type = value_list[0] * 16 * 16 * 16 * 16 + value_list[1]
                     if value_type in bgp_cons.WELL_KNOW_COMMUNITY_INT_2_STR:
                         community.append(bgp_cons.WELL_KNOW_COMMUNITY_INT_2_STR[value_type])
                     else:
-                        community.append("%s:%s" % (value_list[0], value_list[1]))
+                        community.append(f"{value_list[0]}:{value_list[1]}")
                     value_list = value_list[2:]
             except Exception:
                 raise excep.UpdateMessageError(
diff --git a/yabgp/message/attribute/extcommunity.py b/yabgp/message/attribute/extcommunity.py
index 6f6e1f3d..fc6f8974 100644
--- a/yabgp/message/attribute/extcommunity.py
+++ b/yabgp/message/attribute/extcommunity.py
@@ -1,5 +1,4 @@
 #!/usr/bin/env python
-# -*- coding:utf-8 -*-
 
 # Copyright 2015-2017 Cisco Systems, Inc.
 # All rights reserved.
@@ -19,18 +18,15 @@
 """BGP extended community
 """
 
-import struct
-import logging
 import binascii
-from builtins import range
+import logging
+import struct
 
 import netaddr
 
-from yabgp.message.attribute import Attribute
-from yabgp.message.attribute import AttributeID
-from yabgp.message.attribute import AttributeFlag
-from yabgp.common import exception as excep
 from yabgp.common import constants as bgp_cons
+from yabgp.common import exception as excep
+from yabgp.message.attribute import Attribute, AttributeFlag, AttributeID
 
 LOG = logging.getLogger()
 
@@ -54,7 +50,6 @@ class ExtCommunity(Attribute):
 
     @classmethod
     def parse(cls, value):
-
         """
         Each Extended Community is encoded as an 8-octet quantity, as
         follows:
@@ -87,86 +82,86 @@ def parse(cls, value):
             if comm_code == bgp_cons.BGP_EXT_COM_RT_0:
                 # Route Target, Format AS(2bytes):AN(4bytes)
                 asn, an = struct.unpack('!HI', value_tmp)
-                ext_community.append('%s:%s:%s' % (bgp_cons.BGP_EXT_COM_STR_DICT[comm_code], asn, an))
+                ext_community.append(f'{bgp_cons.BGP_EXT_COM_STR_DICT[comm_code]}:{asn}:{an}')
 
             elif comm_code == bgp_cons.BGP_EXT_COM_RT_1:
                 # Route Target,Format IPv4 address(4bytes):AN(2bytes)
                 ipv4 = str(netaddr.IPAddress(struct.unpack('!I', value_tmp[0:4])[0]))
                 an = struct.unpack('!H', value_tmp[4:])[0]
-                ext_community.append('%s:%s:%s' % (bgp_cons.BGP_EXT_COM_STR_DICT[comm_code], ipv4, an))
+                ext_community.append(f'{bgp_cons.BGP_EXT_COM_STR_DICT[comm_code]}:{ipv4}:{an}')
 
             elif comm_code == bgp_cons.BGP_EXT_COM_RT_2:
                 # Route Target,Format AS(4bytes):AN(2bytes)
                 asn, an = struct.unpack('!IH', value_tmp)
-                ext_community.append('%s:%s:%s' % (bgp_cons.BGP_EXT_COM_STR_DICT[comm_code], asn, an))
+                ext_community.append(f'{bgp_cons.BGP_EXT_COM_STR_DICT[comm_code]}:{asn}:{an}')
 
             # Route Origin
             elif comm_code == bgp_cons.BGP_EXT_COM_RO_0:
                 # Route Origin,Format AS(2bytes):AN(4bytes)
                 asn, an = struct.unpack('!HI', value_tmp)
-                ext_community.append('%s:%s:%s' % (bgp_cons.BGP_EXT_COM_STR_DICT[comm_code], asn, an))
+                ext_community.append(f'{bgp_cons.BGP_EXT_COM_STR_DICT[comm_code]}:{asn}:{an}')
 
             elif comm_code == bgp_cons.BGP_EXT_COM_RO_1:
                 # Route Origin,Format IP address:AN(2bytes)
                 ipv4 = str(netaddr.IPAddress(struct.unpack('!I', value_tmp[0:4])[0]))
                 an = struct.unpack('!H', value_tmp[4:])[0]
-                ext_community.append('%s:%s:%s' % (bgp_cons.BGP_EXT_COM_STR_DICT[comm_code], ipv4, an))
+                ext_community.append(f'{bgp_cons.BGP_EXT_COM_STR_DICT[comm_code]}:{ipv4}:{an}')
 
             elif comm_code == bgp_cons.BGP_EXT_COM_RO_2:
                 # Route Origin,Format AS(2bytes):AN(4bytes)
                 asn, an = struct.unpack('!IH', value_tmp)
-                ext_community.append('%s:%s:%s' % (bgp_cons.BGP_EXT_COM_STR_DICT[comm_code], asn, an))
+                ext_community.append(f'{bgp_cons.BGP_EXT_COM_STR_DICT[comm_code]}:{asn}:{an}')
 
             # BGP Flow spec
             elif comm_code == bgp_cons.BGP_EXT_REDIRECT_NH:
                 ipv4 = str(netaddr.IPAddress(int(binascii.b2a_hex(value_tmp[0:4]), 16)))
                 copy_flag = struct.unpack('!H', value_tmp[4:])[0]
-                ext_community.append('%s:%s:%s' % (bgp_cons.BGP_EXT_COM_STR_DICT[comm_code], ipv4, copy_flag))
+                ext_community.append(f'{bgp_cons.BGP_EXT_COM_STR_DICT[comm_code]}:{ipv4}:{copy_flag}')
             elif comm_code == bgp_cons.BGP_EXT_TRA_RATE:
                 asn, rate = struct.unpack('!Hf', value_tmp)
-                ext_community.append('%s:%s:%s' % (bgp_cons.BGP_EXT_COM_STR_DICT[comm_code], asn, int(rate)))
+                ext_community.append(f'{bgp_cons.BGP_EXT_COM_STR_DICT[comm_code]}:{asn}:{int(rate)}')
 
             elif comm_code == bgp_cons.BGP_EXT_TRA_ACTION:
                 bit_value = parse_bit(ord(value_tmp[-1]))
                 ext_community.append(
-                    '%s:S:%s,T:%s' % (bgp_cons.BGP_EXT_COM_STR_DICT[comm_code], bit_value['6'], bit_value['7']))
+                    '{}:S:{},T:{}'.format(bgp_cons.BGP_EXT_COM_STR_DICT[comm_code], bit_value['6'], bit_value['7']))
             elif comm_code == bgp_cons.BGP_EXT_REDIRECT_VRF:
                 asn, an = struct.unpack('!HI', value_tmp)
-                ext_community.append('%s:%s:%s' % (bgp_cons.BGP_EXT_COM_STR_DICT[comm_code], asn, an))
+                ext_community.append(f'{bgp_cons.BGP_EXT_COM_STR_DICT[comm_code]}:{asn}:{an}')
             elif comm_code == bgp_cons.BGP_EXT_TRA_MARK:
                 mark = ord(value_tmp[-1:])
-                ext_community.append('%s:%s' % (bgp_cons.BGP_EXT_COM_STR_DICT[comm_code], mark))
+                ext_community.append(f'{bgp_cons.BGP_EXT_COM_STR_DICT[comm_code]}:{mark}')
 
             # Transitive Opaque
             elif comm_code == bgp_cons.BGP_EXT_COM_ENCAP:
                 ext_community.append(
-                    '%s:%s' % (bgp_cons.BGP_EXT_COM_STR_DICT[comm_code], struct.unpack('!I', value_tmp[2:])[0]))
+                    '{}:{}'.format(bgp_cons.BGP_EXT_COM_STR_DICT[comm_code], struct.unpack('!I', value_tmp[2:])[0]))
             elif comm_code == bgp_cons.BGP_EXT_COM_COLOR:
-                ext_community.append('%s:%s' % (bgp_cons.BGP_EXT_COM_STR_DICT[comm_code],
-                                                struct.unpack('!I', value_tmp[2:])[0]))
+                ext_community.append('{}:{}'.format(bgp_cons.BGP_EXT_COM_STR_DICT[comm_code],
+                                                    struct.unpack('!I', value_tmp[2:])[0]))
             # EVPN
             elif comm_code == bgp_cons.BGP_EXT_COM_EVPN_ES_IMPORT:
                 mac = str(netaddr.EUI(int(binascii.b2a_hex(value_tmp), 16)))
-                ext_community.append('%s:%s' % (bgp_cons.BGP_EXT_COM_STR_DICT[comm_code], mac))
+                ext_community.append(f'{bgp_cons.BGP_EXT_COM_STR_DICT[comm_code]}:{mac}')
             elif comm_code == bgp_cons.BGP_EXT_COM_EVPN_MAC_MOBIL:
                 flag = ord(value_tmp[0:1])
                 seq = struct.unpack('!I', value_tmp[2:])[0]
-                ext_community.append('%s:%s:%s' % (bgp_cons.BGP_EXT_COM_STR_DICT[comm_code], flag, seq))
+                ext_community.append(f'{bgp_cons.BGP_EXT_COM_STR_DICT[comm_code]}:{flag}:{seq}')
             elif comm_code == bgp_cons.BGP_EXT_COM_EVPN_ESI_MPLS_LABEL:
                 flag = ord(value_tmp[0:1])
                 label = struct.unpack('!L', b'\00' + value_tmp[3:])[0]
                 label >>= 4
-                ext_community.append('%s:%s:%s' % (bgp_cons.BGP_EXT_COM_STR_DICT[comm_code], flag, label))
+                ext_community.append(f'{bgp_cons.BGP_EXT_COM_STR_DICT[comm_code]}:{flag}:{label}')
             elif comm_code == bgp_cons.BGP_EXT_COM_EVPN_ROUTE_MAC:
-                ext_community.append('%s:%s' % (
-                    bgp_cons.BGP_EXT_COM_STR_DICT[comm_code], str(netaddr.EUI(int(binascii.b2a_hex(value_tmp), 16)))))
+                mac = str(netaddr.EUI(int(binascii.b2a_hex(value_tmp), 16)))
+                ext_community.append(f'{bgp_cons.BGP_EXT_COM_STR_DICT[comm_code]}:{mac}')
             # BGP link bandwith
             elif comm_code == bgp_cons.BGP_EXT_COM_LINK_BW:
                 asn, an = struct.unpack('!HI', value_tmp)
-                ext_community.append('%s:%s:%s' % (bgp_cons.BGP_EXT_COM_STR_DICT[comm_code], asn, an))
+                ext_community.append(f'{bgp_cons.BGP_EXT_COM_STR_DICT[comm_code]}:{asn}:{an}')
             else:
                 ext_community.append([bgp_cons.BGP_EXT_COM_UNKNOW, repr(value_tmp)])
-                LOG.warn('unknow bgp extended community, type=%s, value=%s', comm_code, repr(value_tmp))
+                LOG.warning('unknow bgp extended community, type=%s, value=%s', comm_code, repr(value_tmp))
 
             value = value[8:]
 
@@ -174,7 +169,6 @@ def parse(cls, value):
 
     @classmethod
     def construct(cls, value):
-
         """
         Construct Extended Community attributes.
         :param value: value list like [('RT':4837:9929),('RT': 1239:9929)]
@@ -257,13 +251,13 @@ def construct(cls, value):
             elif item[0] == bgp_cons.BGP_EXT_TRA_ACTION:
                 ext_community_hex += struct.pack('!HIBB', item[0], 0, 0, item[1].get('s', 0) * 2 + item[1].get('t', 0))
             else:
-                LOG.warn('unknow bgp extended community for construct, type=%s, value=%s', item[0], item[1])
+                LOG.warning('unknow bgp extended community for construct, type=%s, value=%s', item[0], item[1])
 
         if ext_community_hex:
             return struct.pack('!B', cls.FLAG) + struct.pack(
                 '!B', cls.ID) + struct.pack('!B', len(ext_community_hex)) + ext_community_hex
         else:
-            LOG.error('construct error, value=%s' % value)
+            LOG.error(f'construct error, value={value}')
             return None
 
 
diff --git a/yabgp/message/attribute/largecommunity.py b/yabgp/message/attribute/largecommunity.py
index 6e7de3eb..cdf85a40 100644
--- a/yabgp/message/attribute/largecommunity.py
+++ b/yabgp/message/attribute/largecommunity.py
@@ -15,11 +15,9 @@
 
 import struct
 
-from yabgp.message.attribute import Attribute
-from yabgp.message.attribute import AttributeID
-from yabgp.message.attribute import AttributeFlag
-from yabgp.common import exception as excep
 from yabgp.common import constants as bgp_cons
+from yabgp.common import exception as excep
+from yabgp.message.attribute import Attribute, AttributeFlag, AttributeID
 
 
 class LargeCommunity(Attribute):
@@ -45,10 +43,10 @@ def parse(cls, value):
         large_community = []
         if value:
             try:
-                length = len(value) / 4
-                value_list = list(struct.unpack('!%di' % length, value))
+                length = len(value) // 4
+                value_list = list(struct.unpack(f'!{length}i', value))
                 while value_list:
-                    large_community.append("%s:%s:%s" % (value_list[0], value_list[1], value_list[2]))
+                    large_community.append(f"{value_list[0]}:{value_list[1]}:{value_list[2]}")
                     value_list = value_list[3:]
             except Exception:
                 raise excep.UpdateMessageError(
diff --git a/yabgp/message/attribute/linkstate/link/adj_seg_id.py b/yabgp/message/attribute/linkstate/link/adj_seg_id.py
index 50e9aa9e..25609138 100644
--- a/yabgp/message/attribute/linkstate/link/adj_seg_id.py
+++ b/yabgp/message/attribute/linkstate/link/adj_seg_id.py
@@ -16,8 +16,8 @@
 import binascii
 
 from yabgp.tlv import TLV
-from ..linkstate import LinkState
 
+from ..linkstate import LinkState
 
 # 0                   1                   2                   3
 # 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
diff --git a/yabgp/message/attribute/linkstate/link/admingroup.py b/yabgp/message/attribute/linkstate/link/admingroup.py
index 5d31e6a4..bddf6632 100644
--- a/yabgp/message/attribute/linkstate/link/admingroup.py
+++ b/yabgp/message/attribute/linkstate/link/admingroup.py
@@ -16,6 +16,7 @@
 import binascii
 
 from yabgp.tlv import TLV
+
 from ..linkstate import LinkState
 
 
diff --git a/yabgp/message/attribute/linkstate/link/app_spec_link_attr.py b/yabgp/message/attribute/linkstate/link/app_spec_link_attr.py
index da417033..430b6296 100644
--- a/yabgp/message/attribute/linkstate/link/app_spec_link_attr.py
+++ b/yabgp/message/attribute/linkstate/link/app_spec_link_attr.py
@@ -13,8 +13,9 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import struct
 import binascii
+import struct
+
 from yabgp.message.attribute.linkstate.linkstate import LinkState
 from yabgp.tlv import TLV
 
@@ -70,10 +71,10 @@ def unpack(cls, data):
             sabm_bytes = data[offset:offset + sabm_len]
             if sabm_len == 4:
                 sabm_int = struct.unpack('!I', sabm_bytes)[0]
-                sabm = '0x{:08x}'.format(sabm_int)
+                sabm = f'0x{sabm_int:08x}'
             elif sabm_len == 8:
                 sabm_int = struct.unpack('!Q', sabm_bytes)[0]
-                sabm = '0x{:016x}'.format(sabm_int)
+                sabm = f'0x{sabm_int:016x}'
             else:
                 sabm = '0x' + binascii.b2a_hex(sabm_bytes).decode('ascii')
             offset += sabm_len
@@ -84,10 +85,10 @@ def unpack(cls, data):
             udabm_bytes = data[offset:offset + udabm_len]
             if udabm_len == 4:
                 udabm_int = struct.unpack('!I', udabm_bytes)[0]
-                udabm = '0x{:08x}'.format(udabm_int)
+                udabm = f'0x{udabm_int:08x}'
             elif udabm_len == 8:
                 udabm_int = struct.unpack('!Q', udabm_bytes)[0]
-                udabm = '0x{:016x}'.format(udabm_int)
+                udabm = f'0x{udabm_int:016x}'
             else:
                 udabm = '0x' + binascii.b2a_hex(udabm_bytes).decode('ascii')
             offset += udabm_len
diff --git a/yabgp/message/attribute/linkstate/link/extend_admin_group.py b/yabgp/message/attribute/linkstate/link/extend_admin_group.py
index 1f14ba73..ccdfeeec 100644
--- a/yabgp/message/attribute/linkstate/link/extend_admin_group.py
+++ b/yabgp/message/attribute/linkstate/link/extend_admin_group.py
@@ -16,6 +16,7 @@
 import binascii
 
 from yabgp.tlv import TLV
+
 from ..linkstate import LinkState
 
 #     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
diff --git a/yabgp/message/attribute/linkstate/link/igp_metric.py b/yabgp/message/attribute/linkstate/link/igp_metric.py
index 040e3c9d..21f40bb9 100644
--- a/yabgp/message/attribute/linkstate/link/igp_metric.py
+++ b/yabgp/message/attribute/linkstate/link/igp_metric.py
@@ -13,10 +13,11 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import struct
 import binascii
+import struct
 
 from yabgp.tlv import TLV
+
 from ..linkstate import LinkState
 
 
diff --git a/yabgp/message/attribute/linkstate/link/lan_adj_sid.py b/yabgp/message/attribute/linkstate/link/lan_adj_sid.py
index 0cb1b8cd..99e48893 100644
--- a/yabgp/message/attribute/linkstate/link/lan_adj_sid.py
+++ b/yabgp/message/attribute/linkstate/link/lan_adj_sid.py
@@ -13,7 +13,6 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from __future__ import division
 import binascii
 
 import netaddr
diff --git a/yabgp/message/attribute/linkstate/link/link_identifiers.py b/yabgp/message/attribute/linkstate/link/link_identifiers.py
index 9d31ac6a..073bf844 100644
--- a/yabgp/message/attribute/linkstate/link/link_identifiers.py
+++ b/yabgp/message/attribute/linkstate/link/link_identifiers.py
@@ -16,6 +16,7 @@
 import struct
 
 from yabgp.tlv import TLV
+
 from ..linkstate import LinkState
 
 #    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
diff --git a/yabgp/message/attribute/linkstate/link/link_msd.py b/yabgp/message/attribute/linkstate/link/link_msd.py
index 4362e309..2bac2d4a 100644
--- a/yabgp/message/attribute/linkstate/link/link_msd.py
+++ b/yabgp/message/attribute/linkstate/link/link_msd.py
@@ -16,6 +16,7 @@
 import struct
 
 from yabgp.tlv import TLV
+
 from ..linkstate import LinkState
 
 
diff --git a/yabgp/message/attribute/linkstate/link/link_name.py b/yabgp/message/attribute/linkstate/link/link_name.py
index 30274407..92d1f61b 100644
--- a/yabgp/message/attribute/linkstate/link/link_name.py
+++ b/yabgp/message/attribute/linkstate/link/link_name.py
@@ -16,6 +16,7 @@
 import binascii
 
 from yabgp.tlv import TLV
+
 from ..linkstate import LinkState
 
 
diff --git a/yabgp/message/attribute/linkstate/link/max_bw.py b/yabgp/message/attribute/linkstate/link/max_bw.py
index 6daef46c..54081a03 100644
--- a/yabgp/message/attribute/linkstate/link/max_bw.py
+++ b/yabgp/message/attribute/linkstate/link/max_bw.py
@@ -16,6 +16,7 @@
 import struct
 
 from yabgp.tlv import TLV
+
 from ..linkstate import LinkState
 
 
diff --git a/yabgp/message/attribute/linkstate/link/max_rsv_bw.py b/yabgp/message/attribute/linkstate/link/max_rsv_bw.py
index 6aa2c4c7..80c543f8 100644
--- a/yabgp/message/attribute/linkstate/link/max_rsv_bw.py
+++ b/yabgp/message/attribute/linkstate/link/max_rsv_bw.py
@@ -16,6 +16,7 @@
 import struct
 
 from yabgp.tlv import TLV
+
 from ..linkstate import LinkState
 
 
diff --git a/yabgp/message/attribute/linkstate/link/min_max_link_delay.py b/yabgp/message/attribute/linkstate/link/min_max_link_delay.py
index add308a6..933c8795 100644
--- a/yabgp/message/attribute/linkstate/link/min_max_link_delay.py
+++ b/yabgp/message/attribute/linkstate/link/min_max_link_delay.py
@@ -16,6 +16,7 @@
 import binascii
 
 from yabgp.tlv import TLV
+
 from ..linkstate import LinkState
 
 
diff --git a/yabgp/message/attribute/linkstate/link/opa_link_attr.py b/yabgp/message/attribute/linkstate/link/opa_link_attr.py
index 779aca72..846180bf 100644
--- a/yabgp/message/attribute/linkstate/link/opa_link_attr.py
+++ b/yabgp/message/attribute/linkstate/link/opa_link_attr.py
@@ -14,6 +14,7 @@
 #    under the License.
 
 import struct
+
 from yabgp.message.attribute.linkstate.linkstate import LinkState
 from yabgp.tlv import TLV
 
@@ -36,4 +37,4 @@ class OpaLinkAttr(TLV):
     def unpack(cls, value):
         """
         """
-        return cls(value=struct.unpack("!%ds" % len(value), value)[0])
+        return cls(value=struct.unpack(f"!{len(value)}s", value)[0])
diff --git a/yabgp/message/attribute/linkstate/link/peer_adj_sid.py b/yabgp/message/attribute/linkstate/link/peer_adj_sid.py
index ffa820f0..e18261fa 100644
--- a/yabgp/message/attribute/linkstate/link/peer_adj_sid.py
+++ b/yabgp/message/attribute/linkstate/link/peer_adj_sid.py
@@ -16,8 +16,8 @@
 import binascii
 
 from yabgp.tlv import TLV
-from ..linkstate import LinkState
 
+from ..linkstate import LinkState
 
 # 0                   1                   2                   3
 # 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
diff --git a/yabgp/message/attribute/linkstate/link/peer_node_sid.py b/yabgp/message/attribute/linkstate/link/peer_node_sid.py
index a1c34860..1e021855 100644
--- a/yabgp/message/attribute/linkstate/link/peer_node_sid.py
+++ b/yabgp/message/attribute/linkstate/link/peer_node_sid.py
@@ -16,8 +16,8 @@
 import binascii
 
 from yabgp.tlv import TLV
-from ..linkstate import LinkState
 
+from ..linkstate import LinkState
 
 # 0                   1                   2                   3
 # 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
diff --git a/yabgp/message/attribute/linkstate/link/peer_set_sid.py b/yabgp/message/attribute/linkstate/link/peer_set_sid.py
index 796d5a60..3680a91a 100644
--- a/yabgp/message/attribute/linkstate/link/peer_set_sid.py
+++ b/yabgp/message/attribute/linkstate/link/peer_set_sid.py
@@ -16,8 +16,8 @@
 import binascii
 
 from yabgp.tlv import TLV
-from ..linkstate import LinkState
 
+from ..linkstate import LinkState
 
 # 0                   1                   2                   3
 # 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
diff --git a/yabgp/message/attribute/linkstate/link/remote_router_id.py b/yabgp/message/attribute/linkstate/link/remote_router_id.py
index 4cf30340..50b210b5 100644
--- a/yabgp/message/attribute/linkstate/link/remote_router_id.py
+++ b/yabgp/message/attribute/linkstate/link/remote_router_id.py
@@ -13,8 +13,9 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from yabgp.tlv import TLV
 from yabgp.net import IPAddress
+from yabgp.tlv import TLV
+
 from ..linkstate import LinkState
 
 
diff --git a/yabgp/message/attribute/linkstate/link/srlg.py b/yabgp/message/attribute/linkstate/link/srlg.py
index bc677024..a56e4af1 100644
--- a/yabgp/message/attribute/linkstate/link/srlg.py
+++ b/yabgp/message/attribute/linkstate/link/srlg.py
@@ -14,6 +14,7 @@
 #    under the License.
 
 import struct
+
 from yabgp.message.attribute.linkstate.linkstate import LinkState
 from yabgp.tlv import TLV
 
diff --git a/yabgp/message/attribute/linkstate/link/srv6_end_x_sid.py b/yabgp/message/attribute/linkstate/link/srv6_end_x_sid.py
index c21c8664..f16f0e24 100644
--- a/yabgp/message/attribute/linkstate/link/srv6_end_x_sid.py
+++ b/yabgp/message/attribute/linkstate/link/srv6_end_x_sid.py
@@ -19,6 +19,7 @@
 import netaddr
 
 from yabgp.tlv import TLV
+
 from ..linkstate import LinkState
 
 
diff --git a/yabgp/message/attribute/linkstate/link/srv6_lan_end_x_sid.py b/yabgp/message/attribute/linkstate/link/srv6_lan_end_x_sid.py
index 758088c6..100979e3 100644
--- a/yabgp/message/attribute/linkstate/link/srv6_lan_end_x_sid.py
+++ b/yabgp/message/attribute/linkstate/link/srv6_lan_end_x_sid.py
@@ -13,13 +13,14 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+import binascii
 import struct
 
-import binascii
 import netaddr
 
 from yabgp.net import IPAddress
 from yabgp.tlv import TLV
+
 from ..linkstate import LinkState
 
 
@@ -63,7 +64,7 @@ def unpack(cls, data, bgpls_pro_id):
             n_id_unpack_end_position = 6 + 4
             neighbor_id = IPAddress.unpack(data[6:n_id_unpack_end_position])
         else:
-            raise Exception('Unknown bgpls_pro_id {0}'.format(bgpls_pro_id))
+            raise Exception(f'Unknown bgpls_pro_id {bgpls_pro_id}')
 
         sid = str(
             netaddr.IPAddress(int(binascii.b2a_hex(data[n_id_unpack_end_position:n_id_unpack_end_position + 16]), 16))
diff --git a/yabgp/message/attribute/linkstate/link/srv6_sid.py b/yabgp/message/attribute/linkstate/link/srv6_sid.py
index dd00b569..048fda6c 100644
--- a/yabgp/message/attribute/linkstate/link/srv6_sid.py
+++ b/yabgp/message/attribute/linkstate/link/srv6_sid.py
@@ -14,6 +14,7 @@
 #    under the License.
 
 from yabgp.tlv import TLV
+
 from ..linkstate import LinkState
 
 
diff --git a/yabgp/message/attribute/linkstate/link/te_metric.py b/yabgp/message/attribute/linkstate/link/te_metric.py
index fd0a7e14..266d9e88 100644
--- a/yabgp/message/attribute/linkstate/link/te_metric.py
+++ b/yabgp/message/attribute/linkstate/link/te_metric.py
@@ -16,6 +16,7 @@
 import struct
 
 from yabgp.tlv import TLV
+
 from ..linkstate import LinkState
 
 
diff --git a/yabgp/message/attribute/linkstate/link/unidirect_avail_bw.py b/yabgp/message/attribute/linkstate/link/unidirect_avail_bw.py
index 06ac94db..70d6df88 100644
--- a/yabgp/message/attribute/linkstate/link/unidirect_avail_bw.py
+++ b/yabgp/message/attribute/linkstate/link/unidirect_avail_bw.py
@@ -16,6 +16,7 @@
 import binascii
 
 from yabgp.tlv import TLV
+
 from ..linkstate import LinkState
 
 
diff --git a/yabgp/message/attribute/linkstate/link/unidirect_bw_util.py b/yabgp/message/attribute/linkstate/link/unidirect_bw_util.py
index d0d92714..8ce688a7 100644
--- a/yabgp/message/attribute/linkstate/link/unidirect_bw_util.py
+++ b/yabgp/message/attribute/linkstate/link/unidirect_bw_util.py
@@ -16,6 +16,7 @@
 import binascii
 
 from yabgp.tlv import TLV
+
 from ..linkstate import LinkState
 
 
diff --git a/yabgp/message/attribute/linkstate/link/unidirect_delay_var.py b/yabgp/message/attribute/linkstate/link/unidirect_delay_var.py
index d47d6208..c4f6dcba 100644
--- a/yabgp/message/attribute/linkstate/link/unidirect_delay_var.py
+++ b/yabgp/message/attribute/linkstate/link/unidirect_delay_var.py
@@ -16,6 +16,7 @@
 import binascii
 
 from yabgp.tlv import TLV
+
 from ..linkstate import LinkState
 
 
diff --git a/yabgp/message/attribute/linkstate/link/unidirect_link_delay.py b/yabgp/message/attribute/linkstate/link/unidirect_link_delay.py
index f6a83baa..a68189db 100644
--- a/yabgp/message/attribute/linkstate/link/unidirect_link_delay.py
+++ b/yabgp/message/attribute/linkstate/link/unidirect_link_delay.py
@@ -16,6 +16,7 @@
 import binascii
 
 from yabgp.tlv import TLV
+
 from ..linkstate import LinkState
 
 
diff --git a/yabgp/message/attribute/linkstate/link/unidirect_packet_loss.py b/yabgp/message/attribute/linkstate/link/unidirect_packet_loss.py
index 2a3b563b..8cf0fe20 100644
--- a/yabgp/message/attribute/linkstate/link/unidirect_packet_loss.py
+++ b/yabgp/message/attribute/linkstate/link/unidirect_packet_loss.py
@@ -16,6 +16,7 @@
 import binascii
 
 from yabgp.tlv import TLV
+
 from ..linkstate import LinkState
 
 
diff --git a/yabgp/message/attribute/linkstate/link/unidirect_residual_bw.py b/yabgp/message/attribute/linkstate/link/unidirect_residual_bw.py
index e5530789..22a2d5da 100644
--- a/yabgp/message/attribute/linkstate/link/unidirect_residual_bw.py
+++ b/yabgp/message/attribute/linkstate/link/unidirect_residual_bw.py
@@ -16,6 +16,7 @@
 import binascii
 
 from yabgp.tlv import TLV
+
 from ..linkstate import LinkState
 
 
diff --git a/yabgp/message/attribute/linkstate/link/unsrv_bw.py b/yabgp/message/attribute/linkstate/link/unsrv_bw.py
index c47df415..6a13b4c7 100644
--- a/yabgp/message/attribute/linkstate/link/unsrv_bw.py
+++ b/yabgp/message/attribute/linkstate/link/unsrv_bw.py
@@ -16,6 +16,7 @@
 import struct
 
 from yabgp.tlv import TLV
+
 from ..linkstate import LinkState
 
 
diff --git a/yabgp/message/attribute/linkstate/linkstate.py b/yabgp/message/attribute/linkstate/linkstate.py
index fb0cccd4..ffe4468d 100644
--- a/yabgp/message/attribute/linkstate/linkstate.py
+++ b/yabgp/message/attribute/linkstate/linkstate.py
@@ -12,11 +12,11 @@
 #    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 #    License for the specific language governing permissions and limitations
 #    under the License.
+import binascii
 import logging
 import struct
-
-import binascii
 import traceback
+
 from yabgp.common import constants as bgp_cons
 from yabgp.common import exception as excep
 from yabgp.message.attribute import Attribute, AttributeFlag, AttributeID
diff --git a/yabgp/message/attribute/linkstate/node/flex_algo_define.py b/yabgp/message/attribute/linkstate/node/flex_algo_define.py
index 17d24ea1..f86ce8d1 100644
--- a/yabgp/message/attribute/linkstate/node/flex_algo_define.py
+++ b/yabgp/message/attribute/linkstate/node/flex_algo_define.py
@@ -13,8 +13,8 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import struct
 import binascii
+import struct
 
 from yabgp.message.attribute.linkstate.linkstate import LinkState
 from yabgp.tlv import TLV
diff --git a/yabgp/message/attribute/linkstate/node/isisarea.py b/yabgp/message/attribute/linkstate/node/isisarea.py
index 91a1988a..cdfc710d 100644
--- a/yabgp/message/attribute/linkstate/node/isisarea.py
+++ b/yabgp/message/attribute/linkstate/node/isisarea.py
@@ -16,6 +16,7 @@
 import binascii
 
 from yabgp.tlv import TLV
+
 from ..linkstate import LinkState
 
 
diff --git a/yabgp/message/attribute/linkstate/node/local_router_id.py b/yabgp/message/attribute/linkstate/node/local_router_id.py
index 433ad583..b66f70d0 100644
--- a/yabgp/message/attribute/linkstate/node/local_router_id.py
+++ b/yabgp/message/attribute/linkstate/node/local_router_id.py
@@ -15,6 +15,7 @@
 
 from yabgp.net import IPAddress
 from yabgp.tlv import TLV
+
 from ..linkstate import LinkState
 
 
diff --git a/yabgp/message/attribute/linkstate/node/mt_id.py b/yabgp/message/attribute/linkstate/node/mt_id.py
index 10198c65..8c4e709c 100644
--- a/yabgp/message/attribute/linkstate/node/mt_id.py
+++ b/yabgp/message/attribute/linkstate/node/mt_id.py
@@ -14,7 +14,9 @@
 #    under the License.
 
 import struct
+
 from yabgp.tlv import TLV
+
 from ..linkstate import LinkState
 
 
diff --git a/yabgp/message/attribute/linkstate/node/name.py b/yabgp/message/attribute/linkstate/node/name.py
index c2ca0be6..80df7962 100644
--- a/yabgp/message/attribute/linkstate/node/name.py
+++ b/yabgp/message/attribute/linkstate/node/name.py
@@ -14,6 +14,7 @@
 #    under the License.
 
 from yabgp.tlv import TLV
+
 from ..linkstate import LinkState
 
 
diff --git a/yabgp/message/attribute/linkstate/node/node_msd.py b/yabgp/message/attribute/linkstate/node/node_msd.py
index 502e98b9..68b12de6 100644
--- a/yabgp/message/attribute/linkstate/node/node_msd.py
+++ b/yabgp/message/attribute/linkstate/node/node_msd.py
@@ -16,6 +16,7 @@
 import struct
 
 from yabgp.tlv import TLV
+
 from ..linkstate import LinkState
 
 
diff --git a/yabgp/message/attribute/linkstate/node/nodeflags.py b/yabgp/message/attribute/linkstate/node/nodeflags.py
index f6761fb7..4035b4f4 100644
--- a/yabgp/message/attribute/linkstate/node/nodeflags.py
+++ b/yabgp/message/attribute/linkstate/node/nodeflags.py
@@ -48,10 +48,10 @@ def unpack(cls, value):
         """
         """
         valueByte = ord(value[0:1])
-        O = valueByte >> 7
+        overload = valueByte >> 7
         T = (valueByte << 1) % 256 >> 7
         E = (valueByte << 2) % 256 >> 7
         B = (valueByte << 3) % 256 >> 7
         R = (valueByte << 4) % 256 >> 7
         V = (valueByte << 5) % 256 >> 7
-        return cls(value={"O": O, "T": T, "E": E, "B": B, "R": R, "V": V})
+        return cls(value={"O": overload, "T": T, "E": E, "B": B, "R": R, "V": V})
diff --git a/yabgp/message/attribute/linkstate/node/opa_node_attr.py b/yabgp/message/attribute/linkstate/node/opa_node_attr.py
index 2cbb320d..2de49421 100644
--- a/yabgp/message/attribute/linkstate/node/opa_node_attr.py
+++ b/yabgp/message/attribute/linkstate/node/opa_node_attr.py
@@ -14,6 +14,7 @@
 #    under the License.
 
 import struct
+
 from yabgp.message.attribute.linkstate.linkstate import LinkState
 from yabgp.tlv import TLV
 
@@ -36,4 +37,4 @@ class OpaNodeAttr(TLV):
     def unpack(cls, value):
         """
         """
-        return cls(value=struct.unpack("!%ds" % len(value), value)[0])
+        return cls(value=struct.unpack(f"!{len(value)}s", value)[0])
diff --git a/yabgp/message/attribute/linkstate/node/sid_or_label.py b/yabgp/message/attribute/linkstate/node/sid_or_label.py
index 65b0702a..b082366c 100644
--- a/yabgp/message/attribute/linkstate/node/sid_or_label.py
+++ b/yabgp/message/attribute/linkstate/node/sid_or_label.py
@@ -14,6 +14,7 @@
 #    under the License.
 
 import struct
+
 from yabgp.message.attribute.linkstate.linkstate import LinkState
 from yabgp.tlv import TLV
 
diff --git a/yabgp/message/attribute/linkstate/node/sr_algorithm.py b/yabgp/message/attribute/linkstate/node/sr_algorithm.py
index f2fc9762..be52f46b 100644
--- a/yabgp/message/attribute/linkstate/node/sr_algorithm.py
+++ b/yabgp/message/attribute/linkstate/node/sr_algorithm.py
@@ -16,6 +16,7 @@
 import struct
 
 from yabgp.tlv import TLV
+
 from ..linkstate import LinkState
 
 #     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
diff --git a/yabgp/message/attribute/linkstate/node/sr_capabilities.py b/yabgp/message/attribute/linkstate/node/sr_capabilities.py
index 4038b3ca..9d8055d8 100644
--- a/yabgp/message/attribute/linkstate/node/sr_capabilities.py
+++ b/yabgp/message/attribute/linkstate/node/sr_capabilities.py
@@ -44,7 +44,7 @@ def unpack(cls, value):
         """
         """
         flags = ord(value[0:1])
-        I = flags >> 7
+        index_flag = flags >> 7
         V = (flags << 1) % 256 >> 7
         value = value[2:]
         results = []
@@ -65,4 +65,4 @@ def unpack(cls, value):
                     value = value[7 + length:]
                     tmp['sid'] = data
                 results.append(tmp)
-        return cls(value={"flag": {"I": I, "V": V}, "value": results})
+        return cls(value={"flag": {"I": index_flag, "V": V}, "value": results})
diff --git a/yabgp/message/attribute/linkstate/node/srv6_capabilities.py b/yabgp/message/attribute/linkstate/node/srv6_capabilities.py
index 53a294d9..fdcaec3f 100644
--- a/yabgp/message/attribute/linkstate/node/srv6_capabilities.py
+++ b/yabgp/message/attribute/linkstate/node/srv6_capabilities.py
@@ -16,6 +16,7 @@
 import struct
 
 from yabgp.tlv import TLV
+
 from ..linkstate import LinkState
 
 
diff --git a/yabgp/message/attribute/linkstate/prefix/ext_igp_route_tag_list.py b/yabgp/message/attribute/linkstate/prefix/ext_igp_route_tag_list.py
index 2e4cae26..fb23ba35 100644
--- a/yabgp/message/attribute/linkstate/prefix/ext_igp_route_tag_list.py
+++ b/yabgp/message/attribute/linkstate/prefix/ext_igp_route_tag_list.py
@@ -14,6 +14,7 @@
 #    under the License.
 
 import struct
+
 from yabgp.message.attribute.linkstate.linkstate import LinkState
 from yabgp.tlv import TLV
 
diff --git a/yabgp/message/attribute/linkstate/prefix/igp_route_tag_list.py b/yabgp/message/attribute/linkstate/prefix/igp_route_tag_list.py
index 1b67c0ef..0f2883c6 100644
--- a/yabgp/message/attribute/linkstate/prefix/igp_route_tag_list.py
+++ b/yabgp/message/attribute/linkstate/prefix/igp_route_tag_list.py
@@ -14,6 +14,7 @@
 #    under the License.
 
 import struct
+
 from yabgp.message.attribute.linkstate.linkstate import LinkState
 from yabgp.tlv import TLV
 
diff --git a/yabgp/message/attribute/linkstate/prefix/ospf_forward_addr.py b/yabgp/message/attribute/linkstate/prefix/ospf_forward_addr.py
index 24ed5562..debce486 100644
--- a/yabgp/message/attribute/linkstate/prefix/ospf_forward_addr.py
+++ b/yabgp/message/attribute/linkstate/prefix/ospf_forward_addr.py
@@ -15,11 +15,11 @@
 
 import binascii
 
-from yabgp.message.attribute.linkstate.linkstate import LinkState
-from yabgp.common.tlv import TLV
-
 import netaddr
 
+from yabgp.common.tlv import TLV
+from yabgp.message.attribute.linkstate.linkstate import LinkState
+
 
 @LinkState.register()
 class OspfForwardingAddr(TLV):
diff --git a/yabgp/message/attribute/linkstate/prefix/prefix_igp_attr.py b/yabgp/message/attribute/linkstate/prefix/prefix_igp_attr.py
index 6f15f2be..088c5f6f 100644
--- a/yabgp/message/attribute/linkstate/prefix/prefix_igp_attr.py
+++ b/yabgp/message/attribute/linkstate/prefix/prefix_igp_attr.py
@@ -16,6 +16,7 @@
 import binascii
 
 from yabgp.tlv import TLV
+
 from ..linkstate import LinkState
 
 #     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
diff --git a/yabgp/message/attribute/linkstate/prefix/prefix_metric.py b/yabgp/message/attribute/linkstate/prefix/prefix_metric.py
index cf02d645..fe826e79 100644
--- a/yabgp/message/attribute/linkstate/prefix/prefix_metric.py
+++ b/yabgp/message/attribute/linkstate/prefix/prefix_metric.py
@@ -16,6 +16,7 @@
 import struct
 
 from yabgp.tlv import TLV
+
 from ..linkstate import LinkState
 
 
diff --git a/yabgp/message/attribute/linkstate/prefix/prefix_sid.py b/yabgp/message/attribute/linkstate/prefix/prefix_sid.py
index 9cdab4bf..b25333c7 100644
--- a/yabgp/message/attribute/linkstate/prefix/prefix_sid.py
+++ b/yabgp/message/attribute/linkstate/prefix/prefix_sid.py
@@ -16,6 +16,7 @@
 import binascii
 
 from yabgp.tlv import TLV
+
 from ..linkstate import LinkState
 
 # https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-ls-segment-routing-ext/?include_text=1
diff --git a/yabgp/message/attribute/linkstate/prefix/src_router_id.py b/yabgp/message/attribute/linkstate/prefix/src_router_id.py
index eceb53d7..758f81e0 100644
--- a/yabgp/message/attribute/linkstate/prefix/src_router_id.py
+++ b/yabgp/message/attribute/linkstate/prefix/src_router_id.py
@@ -13,14 +13,14 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+import binascii
 import struct
 
-import binascii
 import netaddr
 
 from yabgp.tlv import TLV
-from ..linkstate import LinkState
 
+from ..linkstate import LinkState
 
 #     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
 #    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
diff --git a/yabgp/message/attribute/linkstate/prefix/srv6_locator.py b/yabgp/message/attribute/linkstate/prefix/srv6_locator.py
index 2fd7d165..341df6f1 100644
--- a/yabgp/message/attribute/linkstate/prefix/srv6_locator.py
+++ b/yabgp/message/attribute/linkstate/prefix/srv6_locator.py
@@ -13,11 +13,11 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import struct
-
 import binascii
+import struct
 
 from yabgp.tlv import TLV
+
 from ..linkstate import LinkState
 
 
diff --git a/yabgp/message/attribute/linkstate/srv6_sid/srv6_bgp_peer_node_sid.py b/yabgp/message/attribute/linkstate/srv6_sid/srv6_bgp_peer_node_sid.py
index 64d3f86e..eed7ebaa 100644
--- a/yabgp/message/attribute/linkstate/srv6_sid/srv6_bgp_peer_node_sid.py
+++ b/yabgp/message/attribute/linkstate/srv6_sid/srv6_bgp_peer_node_sid.py
@@ -16,6 +16,7 @@
 import struct
 
 from yabgp.tlv import TLV
+
 from ..linkstate import LinkState
 
 
diff --git a/yabgp/message/attribute/linkstate/srv6_sid/srv6_endpoint_behavior.py b/yabgp/message/attribute/linkstate/srv6_sid/srv6_endpoint_behavior.py
index b1ab8b35..6561f74a 100644
--- a/yabgp/message/attribute/linkstate/srv6_sid/srv6_endpoint_behavior.py
+++ b/yabgp/message/attribute/linkstate/srv6_sid/srv6_endpoint_behavior.py
@@ -16,6 +16,7 @@
 import struct
 
 from yabgp.tlv import TLV
+
 from ..linkstate import LinkState
 
 
diff --git a/yabgp/message/attribute/localpref.py b/yabgp/message/attribute/localpref.py
index 115c673a..5c46029f 100644
--- a/yabgp/message/attribute/localpref.py
+++ b/yabgp/message/attribute/localpref.py
@@ -15,11 +15,9 @@
 
 import struct
 
-from yabgp.message.attribute import Attribute
-from yabgp.message.attribute import AttributeID
-from yabgp.message.attribute import AttributeFlag
 from yabgp.common import constants as bgp_cons
 from yabgp.common import exception as excep
+from yabgp.message.attribute import Attribute, AttributeFlag, AttributeID
 
 
 class LocalPreference(Attribute):
@@ -35,14 +33,13 @@ class LocalPreference(Attribute):
 
     @classmethod
     def parse(cls, value):
-
         """
         parse bgp local preference attribute
         :param value: raw binary value
         """
         try:
             return struct.unpack('!I', value)[0]
-        except:
+        except struct.error:
             raise excep.UpdateMessageError(
                 sub_error=bgp_cons.ERR_MSG_UPDATE_ATTR_LEN,
                 data=value)
diff --git a/yabgp/message/attribute/med.py b/yabgp/message/attribute/med.py
index c3d36c77..1156f93e 100644
--- a/yabgp/message/attribute/med.py
+++ b/yabgp/message/attribute/med.py
@@ -15,11 +15,9 @@
 
 import struct
 
-from yabgp.message.attribute import Attribute
-from yabgp.message.attribute import AttributeID
-from yabgp.message.attribute import AttributeFlag
 from yabgp.common import constants as bgp_cons
 from yabgp.common import exception as excep
+from yabgp.message.attribute import Attribute, AttributeFlag, AttributeID
 
 
 class MED(Attribute):
@@ -43,7 +41,7 @@ def parse(cls, value):
         """
         try:
             return struct.unpack('!I', value)[0]
-        except:
+        except struct.error:
             raise excep.UpdateMessageError(
                 sub_error=bgp_cons.ERR_MSG_UPDATE_ATTR_LEN,
                 data=value)
diff --git a/yabgp/message/attribute/mpreachnlri.py b/yabgp/message/attribute/mpreachnlri.py
index 562ca5b4..35faaf3f 100644
--- a/yabgp/message/attribute/mpreachnlri.py
+++ b/yabgp/message/attribute/mpreachnlri.py
@@ -16,28 +16,25 @@
 """BGP Attribute MP_REACH_NLRI
 """
 
-import struct
 import binascii
+import struct
 
 import netaddr
 
-from yabgp.message.attribute import Attribute
-from yabgp.message.attribute import AttributeFlag
-from yabgp.message.attribute import AttributeID
-from yabgp.common import afn
-from yabgp.common import safn
-from yabgp.common import exception as excep
+from yabgp.common import afn, safn
 from yabgp.common import constants as bgp_cons
-from yabgp.message.attribute.nlri.ipv4_mpls_vpn import IPv4MPLSVPN
-from yabgp.message.attribute.nlri.ipv6_mpls_vpn import IPv6MPLSVPN
+from yabgp.common import exception as excep
+from yabgp.message.attribute import Attribute, AttributeFlag, AttributeID
+from yabgp.message.attribute.nlri.evpn import EVPN
 from yabgp.message.attribute.nlri.ipv4_flowspec import IPv4FlowSpec
-from yabgp.message.attribute.nlri.ipv6_flowspec import IPv6FlowSpec
+from yabgp.message.attribute.nlri.ipv4_mpls_vpn import IPv4MPLSVPN
 from yabgp.message.attribute.nlri.ipv4_srte import IPv4SRTE
+from yabgp.message.attribute.nlri.ipv4_unicast import IPv4Unicast
+from yabgp.message.attribute.nlri.ipv6_flowspec import IPv6FlowSpec
+from yabgp.message.attribute.nlri.ipv6_mpls_vpn import IPv6MPLSVPN
 from yabgp.message.attribute.nlri.ipv6_unicast import IPv6Unicast
 from yabgp.message.attribute.nlri.labeled_unicast.ipv4 import IPv4LabeledUnicast
 from yabgp.message.attribute.nlri.labeled_unicast.ipv6 import IPv6LabeledUnicast
-from yabgp.message.attribute.nlri.ipv4_unicast import IPv4Unicast
-from yabgp.message.attribute.nlri.evpn import EVPN
 from yabgp.message.attribute.nlri.linkstate import BGPLS
 
 
@@ -249,7 +246,7 @@ def construct(cls, value):
                             + struct.pack('!H', len(attr_value)) + attr_value
                 except Exception as e:
                     raise excep.ConstructAttributeFailed(
-                        reason='failed to construct attributes: %s' % e,
+                        reason=f'failed to construct attributes: {e}',
                         data=value
                     )
             elif safi == safn.SAFNUM_SRTE:  # BGP SR TE Policy
@@ -267,7 +264,7 @@ def construct(cls, value):
                             + struct.pack('!H', len(attr_value)) + attr_value
                 except Exception as e:
                     raise excep.ConstructAttributeFailed(
-                        reason='failed to construct attributes: %s' % e,
+                        reason=f'failed to construct attributes: {e}',
                         data=value
                     )
             elif safi == safn.SAFNUM_MPLS_LABEL:
@@ -285,7 +282,7 @@ def construct(cls, value):
                             + struct.pack('!H', len(attr_value)) + attr_value
                 except Exception as e:
                     raise excep.ConstructAttributeFailed(
-                        reason='failed to construct attributes: %s' % e,
+                        reason=f'failed to construct attributes: {e}',
                         data=value
                     )
             else:
@@ -318,7 +315,7 @@ def construct(cls, value):
                             + struct.pack('!H', len(attr_value)) + attr_value
                 except Exception as e:
                     raise excep.ConstructAttributeFailed(
-                        reason='failed to construct attributes: %s' % e,
+                        reason=f'failed to construct attributes: {e}',
                         data=value
                     )
             elif safi == safn.SAFNUM_UNICAST:
@@ -349,7 +346,7 @@ def construct(cls, value):
                             + struct.pack('!H', len(attr_value)) + attr_value
                 except Exception as e:
                     raise excep.ConstructAttributeFailed(
-                        reason='failed to construct attributes: %s' % e,
+                        reason=f'failed to construct attributes: {e}',
                         data=value
                     )
             else:
diff --git a/yabgp/message/attribute/mpunreachnlri.py b/yabgp/message/attribute/mpunreachnlri.py
index 056e10bb..1a0dc184 100644
--- a/yabgp/message/attribute/mpunreachnlri.py
+++ b/yabgp/message/attribute/mpunreachnlri.py
@@ -18,22 +18,19 @@
 
 import struct
 
-from yabgp.message.attribute import Attribute
-from yabgp.message.attribute import AttributeFlag
-from yabgp.message.attribute import AttributeID
+from yabgp.common import afn, safn
+from yabgp.common import constants as bgp_cons
+from yabgp.common import exception as excep
+from yabgp.message.attribute import Attribute, AttributeFlag, AttributeID
+from yabgp.message.attribute.nlri.evpn import EVPN
+from yabgp.message.attribute.nlri.ipv4_flowspec import IPv4FlowSpec
 from yabgp.message.attribute.nlri.ipv4_mpls_vpn import IPv4MPLSVPN
+from yabgp.message.attribute.nlri.ipv4_srte import IPv4SRTE
 from yabgp.message.attribute.nlri.ipv4_unicast import IPv4Unicast
 from yabgp.message.attribute.nlri.ipv6_mpls_vpn import IPv6MPLSVPN
-from yabgp.message.attribute.nlri.ipv4_flowspec import IPv4FlowSpec
 from yabgp.message.attribute.nlri.ipv6_unicast import IPv6Unicast
 from yabgp.message.attribute.nlri.labeled_unicast.ipv4 import IPv4LabeledUnicast
-from yabgp.message.attribute.nlri.evpn import EVPN
 from yabgp.message.attribute.nlri.linkstate import BGPLS
-from yabgp.message.attribute.nlri.ipv4_srte import IPv4SRTE
-from yabgp.common import afn
-from yabgp.common import safn
-from yabgp.common import exception as excep
-from yabgp.common import constants as bgp_cons
 
 
 class MpUnReachNLRI(Attribute):
diff --git a/yabgp/message/attribute/nexthop.py b/yabgp/message/attribute/nexthop.py
index 22d32e45..0703ec50 100644
--- a/yabgp/message/attribute/nexthop.py
+++ b/yabgp/message/attribute/nexthop.py
@@ -13,16 +13,14 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import struct
 import binascii
+import struct
 
 import netaddr
 
-from yabgp.message.attribute import Attribute
-from yabgp.message.attribute import AttributeID
-from yabgp.message.attribute import AttributeFlag
 from yabgp.common import constants as bgp_cons
 from yabgp.common import exception as excep
+from yabgp.message.attribute import Attribute, AttributeFlag, AttributeID
 
 
 class NextHop(Attribute):
diff --git a/yabgp/message/attribute/nlri/__init__.py b/yabgp/message/attribute/nlri/__init__.py
index 9d172e85..b6cd0b76 100644
--- a/yabgp/message/attribute/nlri/__init__.py
+++ b/yabgp/message/attribute/nlri/__init__.py
@@ -13,14 +13,13 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from __future__ import division
-import struct
 import binascii
+import struct
 
 import netaddr
 
 
-class NLRI(object):
+class NLRI:
 
     @classmethod
     def parse(cls, *args):
diff --git a/yabgp/message/attribute/nlri/evpn.py b/yabgp/message/attribute/nlri/evpn.py
index 5d23753b..0e3ae966 100644
--- a/yabgp/message/attribute/nlri/evpn.py
+++ b/yabgp/message/attribute/nlri/evpn.py
@@ -13,15 +13,15 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from __future__ import division
-import struct
 import binascii
+import struct
 
 import netaddr
-from yabgp.common import afn
-from yabgp.common import safn
+
+from yabgp.common import afn, safn
 from yabgp.common import constants as bgp_cons
 from yabgp.message.attribute.nlri import NLRI
+
 # from yabgp.message.attribute.nlri.mpls_vpn import MPLSVPN
 
 
@@ -93,7 +93,7 @@ def signal_evpn_overlay(attr_dict):
         try:
             afi_safi = tuple(attr_dict.get(bgp_cons.BGPTYPE_MP_REACH_NLRI).get('afi_safi'))
             community_ext = attr_dict.get(bgp_cons.BGPTYPE_EXTENDED_COMMUNITY)
-        except:
+        except Exception:
             return evpn_overlay
         if afi_safi == (afn.AFNUM_L2VPN, safn.SAFNUM_EVPN):
             evpn_overlay['evpn'] = True
@@ -116,14 +116,14 @@ def parse_rd(cls, data):
         rd_value = data[2:8]
         if rd_type == bgp_cons.BGP_ROUTE_DISTINGUISHER_TYPE_0:
             asn, an = struct.unpack('!HI', rd_value)
-            rd = '%s:%s' % (asn, an)
+            rd = f'{asn}:{an}'
         elif rd_type == bgp_cons.BGP_ROUTE_DISTINGUISHER_TYPE_1:
             ip = str(netaddr.IPAddress(struct.unpack('!I', rd_value[0:4])[0]))
             an = struct.unpack('!H', rd_value[4:6])[0]
-            rd = '%s:%s' % (ip, an)
+            rd = f'{ip}:{an}'
         elif rd_type == bgp_cons.BGP_ROUTE_DISTINGUISHER_TYPE_2:
             asn, an = struct.unpack('!IH', rd_value)
-            rd = '%s:%s' % (asn, an)
+            rd = f'{asn}:{an}'
         else:
             # fixme(by xiaopeng163) for other rd type process
             rd = str(rd_value)
@@ -492,7 +492,7 @@ def parse(cls, value, iswithdraw=False):
             # ipv6
             offset = 16
 
-        route['prefix'] = '%s/%s' % (str(netaddr.IPAddress(int(binascii.b2a_hex(value[0: offset]), 16))), ip_addr_len)
+        route['prefix'] = f'{str(netaddr.IPAddress(int(binascii.b2a_hex(value[0: offset]), 16)))}/{ip_addr_len}'
         value = value[offset:]
         route['gateway'] = str(netaddr.IPAddress(int(binascii.b2a_hex(value[0: offset]), 16)))
         value = value[offset:]
diff --git a/yabgp/message/attribute/nlri/ipv4_flowspec.py b/yabgp/message/attribute/nlri/ipv4_flowspec.py
index 23858d41..a08c1ec5 100644
--- a/yabgp/message/attribute/nlri/ipv4_flowspec.py
+++ b/yabgp/message/attribute/nlri/ipv4_flowspec.py
@@ -15,8 +15,6 @@
 
 """IPv4 Flowspec NLRI
 """
-from __future__ import division
-from builtins import range
 import binascii
 import math
 import struct
@@ -78,7 +76,7 @@ def construct(cls, value):
     def construct_nlri(cls, data):
         """ Construct NLRI """
         # there may have many filters in each nlri
-        data = dict([(int(l), r) for (l, r) in data.items()])
+        data = dict([(int(k), r) for (k, r) in data.items()])
         nlri_tmp = b''
         for type_tmp in [bgp_cons.BGPNLRI_FSPEC_DST_PFIX, bgp_cons.BGPNLRI_FSPEC_SRC_PFIX]:
             if data.get(type_tmp):
@@ -114,7 +112,7 @@ def parse_prefix(data):
         else:
             prefix_data = [ord(i) for i in tmp]
         prefix_data = prefix_data + list(str(0)) * 4
-        prefix = "%s.%s.%s.%s" % (tuple(prefix_data[0:4])) + '/' + str(prefix_len)
+        prefix = "{}.{}.{}.{}".format(*tuple(prefix_data[0:4])) + '/' + str(prefix_len)
         return prefix, octet_len + 1
 
     @classmethod
diff --git a/yabgp/message/attribute/nlri/ipv4_mpls_vpn.py b/yabgp/message/attribute/nlri/ipv4_mpls_vpn.py
index b4e94a76..1883a463 100644
--- a/yabgp/message/attribute/nlri/ipv4_mpls_vpn.py
+++ b/yabgp/message/attribute/nlri/ipv4_mpls_vpn.py
@@ -1,4 +1,3 @@
-# coding=utf-8
 # Copyright 2015 Cisco Systems, Inc.
 # All rights reserved.
 #
@@ -14,9 +13,9 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from yabgp.message.attribute.nlri.mpls_vpn import MPLSVPN
 from yabgp.common.afn import AFNUM_INET
 from yabgp.common.safn import SAFNUM_LAB_VPNUNICAST
+from yabgp.message.attribute.nlri.mpls_vpn import MPLSVPN
 
 
 class IPv4MPLSVPN(MPLSVPN):
@@ -29,8 +28,8 @@ class IPv4MPLSVPN(MPLSVPN):
 
     @classmethod
     def parse(cls, value, iswithdraw=False, addpath=False):
-        return super(IPv4MPLSVPN, cls).parse(value, iswithdraw=iswithdraw, addpath=addpath)
+        return super().parse(value, iswithdraw=iswithdraw, addpath=addpath)
 
     @classmethod
     def construct(cls, value, iswithdraw=False):
-        return super(IPv4MPLSVPN, cls).construct(value, iswithdraw=iswithdraw)
+        return super().construct(value, iswithdraw=iswithdraw)
diff --git a/yabgp/message/attribute/nlri/ipv4_srte.py b/yabgp/message/attribute/nlri/ipv4_srte.py
index 84763af4..0e08debb 100644
--- a/yabgp/message/attribute/nlri/ipv4_srte.py
+++ b/yabgp/message/attribute/nlri/ipv4_srte.py
@@ -16,6 +16,7 @@
 """IPv4 SR TE Policy NLRI
 """
 import struct
+
 import netaddr
 
 from yabgp.message.attribute.nlri import NLRI
diff --git a/yabgp/message/attribute/nlri/ipv4_unicast.py b/yabgp/message/attribute/nlri/ipv4_unicast.py
index 5227abc6..7334f3ee 100644
--- a/yabgp/message/attribute/nlri/ipv4_unicast.py
+++ b/yabgp/message/attribute/nlri/ipv4_unicast.py
@@ -1,5 +1,4 @@
 # !/usr/bin/env python
-# -*- coding:utf-8 -*-
 """
 dalian-stc-dev@cisco.com
 Copyright 2019 Cisco Systems, Inc.
@@ -20,15 +19,15 @@
 
 """ IPv4 Unicast """
 
-import struct
 import binascii
 import logging
+import struct
+
 import netaddr
 
-from yabgp.message.attribute.nlri import NLRI
-from yabgp.common import exception as excep
 from yabgp.common import constants as bgp_cons
-
+from yabgp.common import exception as excep
+from yabgp.message.attribute.nlri import NLRI
 
 LOG = logging.getLogger()
 
@@ -76,7 +75,7 @@ def parse(nlri_data, addpath=False):
             if remainder > 0:
                 prefix_data[-1] &= 255 << (8 - remainder)
             prefix_data = prefix_data + list(str(0)) * 4
-            prefix = "%s.%s.%s.%s" % (tuple(prefix_data[0:4])) + '/' + str(prefix_len)
+            prefix = "{}.{}.{}.{}".format(*tuple(prefix_data[0:4])) + '/' + str(prefix_len)
             if not addpath:
                 prefixes.append(prefix)
             else:
diff --git a/yabgp/message/attribute/nlri/ipv6_flowspec.py b/yabgp/message/attribute/nlri/ipv6_flowspec.py
index 3492c9d8..2a547e5b 100644
--- a/yabgp/message/attribute/nlri/ipv6_flowspec.py
+++ b/yabgp/message/attribute/nlri/ipv6_flowspec.py
@@ -15,8 +15,6 @@
 
 """IPv6 Flowspec NLRI
 """
-from __future__ import division
-from builtins import range
 import binascii
 import math
 import struct
@@ -78,7 +76,7 @@ def construct(cls, value):
     def construct_nlri(cls, data):
         """ Construct NLRI """
         # there may have many filters in each nlri
-        data = dict([(int(l), r) for (l, r) in data.items()])
+        data = dict([(int(k), r) for (k, r) in data.items()])
         nlri_tmp = b''
         for type_tmp in [bgp_cons.BGPNLRI_IPV6_FSPEC_DST_PFIX, bgp_cons.BGPNLRI_IPV6_FSPEC_SRC_PFIX]:
             if data.get(type_tmp):
@@ -116,7 +114,7 @@ def parse_prefix(data):
         else:
             prefix_data = [ord(i) for i in tmp]
         prefix_data = prefix_data + list(str(0)) * 4
-        prefix = "%s.%s.%s.%s" % (tuple(prefix_data[0:4])) + '/' + str(prefix_len)
+        prefix = "{}.{}.{}.{}".format(*tuple(prefix_data[0:4])) + '/' + str(prefix_len)
         return prefix, octet_len + 1
 
     @classmethod
diff --git a/yabgp/message/attribute/nlri/ipv6_mpls_vpn.py b/yabgp/message/attribute/nlri/ipv6_mpls_vpn.py
index 39962cf1..6c80ed4f 100644
--- a/yabgp/message/attribute/nlri/ipv6_mpls_vpn.py
+++ b/yabgp/message/attribute/nlri/ipv6_mpls_vpn.py
@@ -13,9 +13,9 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from yabgp.message.attribute.nlri.mpls_vpn import MPLSVPN
 from yabgp.common.afn import AFNUM_INET6
 from yabgp.common.safn import SAFNUM_LAB_VPNUNICAST
+from yabgp.message.attribute.nlri.mpls_vpn import MPLSVPN
 
 
 class IPv6MPLSVPN(MPLSVPN):
@@ -27,8 +27,8 @@ class IPv6MPLSVPN(MPLSVPN):
 
     @classmethod
     def parse(cls, value, iswithdraw=False, addpath=False):
-        return super(IPv6MPLSVPN, cls).parse(value, iswithdraw=iswithdraw, addpath=addpath)
+        return super().parse(value, iswithdraw=iswithdraw, addpath=addpath)
 
     @classmethod
     def construct(cls, value, iswithdraw=False):
-        return super(IPv6MPLSVPN, cls).construct(value, iswithdraw=iswithdraw)
+        return super().construct(value, iswithdraw=iswithdraw)
diff --git a/yabgp/message/attribute/nlri/ipv6_unicast.py b/yabgp/message/attribute/nlri/ipv6_unicast.py
index aba258ff..f1ef9577 100644
--- a/yabgp/message/attribute/nlri/ipv6_unicast.py
+++ b/yabgp/message/attribute/nlri/ipv6_unicast.py
@@ -15,8 +15,9 @@
 
 """ IPv6 Unicast """
 
-import struct
 import binascii
+import struct
+
 import netaddr
 
 from yabgp.message.attribute.nlri import NLRI
@@ -56,7 +57,7 @@ def parse(cls, nlri_data, addpath=False):
             for i in range(0, zero_len):
                 prefix_bit += b'\x00'
 
-            prefix_addr = str(netaddr.IPAddress(int(binascii.b2a_hex(prefix_bit), 16))) + '/%s' % prefix_bit_len
+            prefix_addr = str(netaddr.IPAddress(int(binascii.b2a_hex(prefix_bit), 16))) + f'/{prefix_bit_len}'
             if addpath:
                 nlri_list.append({'prefix': prefix_addr, 'path_id': path_id})
             else:
diff --git a/yabgp/message/attribute/nlri/labeled_unicast/__init__.py b/yabgp/message/attribute/nlri/labeled_unicast/__init__.py
index bea12a3d..ed480d91 100644
--- a/yabgp/message/attribute/nlri/labeled_unicast/__init__.py
+++ b/yabgp/message/attribute/nlri/labeled_unicast/__init__.py
@@ -13,16 +13,14 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from __future__ import division
-import struct
 import binascii
-
+import struct
 
 import netaddr
 
-from yabgp.message.attribute.nlri import NLRI
-from yabgp.common.afn import AFNUM_INET6, AFNUM_INET
+from yabgp.common.afn import AFNUM_INET, AFNUM_INET6
 from yabgp.common.safn import SAFNUM_MPLS_LABEL
+from yabgp.message.attribute.nlri import NLRI
 
 
 class LabeledUnicast(NLRI):
diff --git a/yabgp/message/attribute/nlri/labeled_unicast/ipv4.py b/yabgp/message/attribute/nlri/labeled_unicast/ipv4.py
index f74d3dcc..76f0f4d7 100644
--- a/yabgp/message/attribute/nlri/labeled_unicast/ipv4.py
+++ b/yabgp/message/attribute/nlri/labeled_unicast/ipv4.py
@@ -13,8 +13,8 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from yabgp.message.attribute.nlri.labeled_unicast import LabeledUnicast
 from yabgp.common.afn import AFNUM_INET
+from yabgp.message.attribute.nlri.labeled_unicast import LabeledUnicast
 
 
 class IPv4LabeledUnicast(LabeledUnicast):
diff --git a/yabgp/message/attribute/nlri/labeled_unicast/ipv6.py b/yabgp/message/attribute/nlri/labeled_unicast/ipv6.py
index 8530905b..bcffaa60 100644
--- a/yabgp/message/attribute/nlri/labeled_unicast/ipv6.py
+++ b/yabgp/message/attribute/nlri/labeled_unicast/ipv6.py
@@ -13,8 +13,8 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from yabgp.message.attribute.nlri.labeled_unicast import LabeledUnicast
 from yabgp.common.afn import AFNUM_INET6
+from yabgp.message.attribute.nlri.labeled_unicast import LabeledUnicast
 
 
 class IPv6LabeledUnicast(LabeledUnicast):
diff --git a/yabgp/message/attribute/nlri/linkstate.py b/yabgp/message/attribute/nlri/linkstate.py
index c394c701..f85d2dc3 100644
--- a/yabgp/message/attribute/nlri/linkstate.py
+++ b/yabgp/message/attribute/nlri/linkstate.py
@@ -15,9 +15,8 @@
 """linkstate
 """
 
-from __future__ import division
-import struct
 import binascii
+import struct
 
 import netaddr
 
@@ -161,7 +160,7 @@ def parse_nlri(cls, data, nlri_type):
                     for i in range(0, (128 - mask) // 8):
                         prefix_bit += b'\x00'
                     ip_str = str(netaddr.IPAddress(int(binascii.b2a_hex(prefix_bit), 16)))
-                descriptor['value'] = "%s/%s" % (ip_str, mask)
+                descriptor['value'] = f"{ip_str}/{mask}"
             elif _type == 518:  # SRv6 SID Information
                 # Refer: https://datatracker.ietf.org/doc/html/draft-ietf-idr-bgpls-srv6-ext-14#section-6.1
                 descriptor['type'] = 'srv6_sid_information'
diff --git a/yabgp/message/attribute/nlri/mpls_vpn.py b/yabgp/message/attribute/nlri/mpls_vpn.py
index b0f4233b..0b127e67 100644
--- a/yabgp/message/attribute/nlri/mpls_vpn.py
+++ b/yabgp/message/attribute/nlri/mpls_vpn.py
@@ -13,13 +13,12 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import struct
 import binascii
+import struct
 
 import netaddr
 
-from yabgp.common import afn
-from yabgp.common import safn
+from yabgp.common import afn, safn
 from yabgp.common import constants as bgp_cons
 from yabgp.message.attribute.nlri import NLRI
 
@@ -159,14 +158,14 @@ def parse_rd(cls, data):
         rd_value = data[2:8]
         if rd_type == bgp_cons.BGP_ROUTE_DISTINGUISHER_TYPE_0:
             asn, an = struct.unpack('!HI', rd_value)
-            rd = '%s:%s' % (asn, an)
+            rd = f'{asn}:{an}'
         elif rd_type == bgp_cons.BGP_ROUTE_DISTINGUISHER_TYPE_1:
             ip = str(netaddr.IPAddress(struct.unpack('!I', rd_value[0:4])[0]))
             an = struct.unpack('!H', rd_value[4:6])[0]
-            rd = '%s:%s' % (ip, an)
+            rd = f'{ip}:{an}'
         elif rd_type == bgp_cons.BGP_ROUTE_DISTINGUISHER_TYPE_2:
             asn, an = struct.unpack('!IH', rd_value)
-            rd = '%s:%s' % (asn, an)
+            rd = f'{asn}:{an}'
         else:
             # fixme(by xiaopeng163) for other rd type process
             rd = str(rd_value)
diff --git a/yabgp/message/attribute/origin.py b/yabgp/message/attribute/origin.py
index 9f71e0c6..70a4971e 100644
--- a/yabgp/message/attribute/origin.py
+++ b/yabgp/message/attribute/origin.py
@@ -15,11 +15,9 @@
 
 import struct
 
-from yabgp.message.attribute import Attribute
-from yabgp.message.attribute import AttributeFlag
-from yabgp.message.attribute import AttributeID
 from yabgp.common import constants as bgp_cons
 from yabgp.common import exception as excep
+from yabgp.message.attribute import Attribute, AttributeFlag, AttributeID
 
 
 class Origin(Attribute):
diff --git a/yabgp/message/attribute/originatorid.py b/yabgp/message/attribute/originatorid.py
index 45b3c131..505b5898 100644
--- a/yabgp/message/attribute/originatorid.py
+++ b/yabgp/message/attribute/originatorid.py
@@ -18,11 +18,9 @@
 
 import netaddr
 
-from yabgp.message.attribute import Attribute
-from yabgp.message.attribute import AttributeFlag
-from yabgp.message.attribute import AttributeID
-from yabgp.common import exception as excep
 from yabgp.common import constants as bgp_cons
+from yabgp.common import exception as excep
+from yabgp.message.attribute import Attribute, AttributeFlag, AttributeID
 
 
 class OriginatorID(Attribute):
diff --git a/yabgp/message/attribute/pmsitunnel.py b/yabgp/message/attribute/pmsitunnel.py
index 19a65c77..2c7e595c 100644
--- a/yabgp/message/attribute/pmsitunnel.py
+++ b/yabgp/message/attribute/pmsitunnel.py
@@ -13,14 +13,13 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import struct
 import binascii
+import struct
+
 import netaddr
 
-from yabgp.message.attribute import Attribute
-from yabgp.message.attribute import AttributeFlag
-from yabgp.message.attribute import AttributeID
 from yabgp.common import constants as bgp_cons
+from yabgp.message.attribute import Attribute, AttributeFlag, AttributeID
 
 
 class PMSITunnel(Attribute):
diff --git a/yabgp/message/attribute/sr/bgpprefixsid.py b/yabgp/message/attribute/sr/bgpprefixsid.py
index d3144705..720f9ee5 100644
--- a/yabgp/message/attribute/sr/bgpprefixsid.py
+++ b/yabgp/message/attribute/sr/bgpprefixsid.py
@@ -13,9 +13,8 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import struct
-
 import binascii
+import struct
 
 from yabgp.message.attribute import Attribute, AttributeFlag, AttributeID
 
diff --git a/yabgp/message/attribute/sr/srv6/l3service.py b/yabgp/message/attribute/sr/srv6/l3service.py
index c78227c3..19751843 100644
--- a/yabgp/message/attribute/sr/srv6/l3service.py
+++ b/yabgp/message/attribute/sr/srv6/l3service.py
@@ -13,13 +13,12 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import struct
-
 import binascii
+import struct
 
 from yabgp.tlv import TLV
-from ..bgpprefixsid import BGPPrefixSID
 
+from ..bgpprefixsid import BGPPrefixSID
 
 # 2.  SRv6 Services TLVs
 #
diff --git a/yabgp/message/attribute/sr/srv6/sidinformation.py b/yabgp/message/attribute/sr/srv6/sidinformation.py
index 4fee4579..e51d6ba1 100644
--- a/yabgp/message/attribute/sr/srv6/sidinformation.py
+++ b/yabgp/message/attribute/sr/srv6/sidinformation.py
@@ -13,14 +13,14 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+import binascii
 import struct
 
-import binascii
 import netaddr
 
 from yabgp.tlv import TLV
-from .l3service import SRv6L3Service
 
+from .l3service import SRv6L3Service
 
 # 3.1.  SRv6 SID Information Sub-TLV
 #
diff --git a/yabgp/message/attribute/sr/srv6/sidstructure.py b/yabgp/message/attribute/sr/srv6/sidstructure.py
index b72bd826..30f6743f 100644
--- a/yabgp/message/attribute/sr/srv6/sidstructure.py
+++ b/yabgp/message/attribute/sr/srv6/sidstructure.py
@@ -14,8 +14,8 @@
 #    under the License.
 
 from yabgp.tlv import TLV
-from .sidinformation import SRv6SIDInformation
 
+from .sidinformation import SRv6SIDInformation
 
 # 3.2.1.  SRv6 SID Structure Sub-Sub-TLV
 #
diff --git a/yabgp/message/attribute/tunnelencaps.py b/yabgp/message/attribute/tunnelencaps.py
index eb76ace6..1e2fbbb2 100644
--- a/yabgp/message/attribute/tunnelencaps.py
+++ b/yabgp/message/attribute/tunnelencaps.py
@@ -20,11 +20,9 @@
 
 import netaddr
 
-from yabgp.message.attribute import Attribute
-from yabgp.message.attribute import AttributeFlag
-from yabgp.message.attribute import AttributeID
 from yabgp.common import constants as bgp_cons
 from yabgp.common import exception as excep
+from yabgp.message.attribute import Attribute, AttributeFlag, AttributeID
 
 
 class TunnelEncaps(Attribute):
@@ -86,20 +84,24 @@ def construct_weight_and_seg(cls, segment_list):
             if seg_type == bgp_cons.BGP_SRTE_SEGMENT_SUBTLV_MPLS:
                 value = seg[list(seg)[0]]
                 sum_value = cls.construct_optional_label_sid(value)
-                seg_hex += struct.pack('!B', bgp_cons.BGP_SRTE_SEGMENT_SUBTLV_MPLS) + struct.pack('!B', 6) + b'\x00\x00' +\
-                    struct.pack('!I', sum_value)
+                seg_hex += (struct.pack('!B', bgp_cons.BGP_SRTE_SEGMENT_SUBTLV_MPLS)
+                            + struct.pack('!B', 6) + b'\x00\x00'
+                            + struct.pack('!I', sum_value))
             # 3
             elif seg_type == bgp_cons.BGP_SRTE_SEGMENT_SUBTLV_IPV4_SID:
                 value = seg[list(seg)[0]]
                 ipv4_node = value['node']
                 if "SID" not in value.keys():
-                    seg_hex += struct.pack('!B', bgp_cons.BGP_SRTE_SEGMENT_SUBTLV_IPV4_SID) + struct.pack('!B', 6) + b'\x00\x00' +\
-                        netaddr.IPAddress(ipv4_node).packed
+                    seg_hex += (struct.pack('!B', bgp_cons.BGP_SRTE_SEGMENT_SUBTLV_IPV4_SID)
+                                + struct.pack('!B', 6) + b'\x00\x00'
+                                + netaddr.IPAddress(ipv4_node).packed)
                 else:
                     opt_sid = value['SID']
                     sum_value = cls.construct_optional_label_sid(opt_sid)
-                    seg_hex += struct.pack('!B', bgp_cons.BGP_SRTE_SEGMENT_SUBTLV_IPV4_SID) + struct.pack('!B', 10) + b'\x00\x00' +\
-                        netaddr.IPAddress(ipv4_node).packed + struct.pack('!I', sum_value)
+                    seg_hex += (struct.pack('!B', bgp_cons.BGP_SRTE_SEGMENT_SUBTLV_IPV4_SID)
+                                + struct.pack('!B', 10) + b'\x00\x00'
+                                + netaddr.IPAddress(ipv4_node).packed
+                                + struct.pack('!I', sum_value))
             # 5
             elif seg_type == bgp_cons.BGP_SRTE_SEGMENT_SUBTLV_IPV4_INDEX_SID:
                 value = seg[list(seg)[0]]
@@ -121,19 +123,22 @@ def construct_weight_and_seg(cls, segment_list):
                 local_ipv4 = value['local']
                 remote_ipv4 = value['remote']
                 if "SID" not in value.keys():
-                    seg_hex += struct.pack('!B', bgp_cons.BGP_SRTE_SEGMENT_SUBTLV_IPV4_ADDR_SID) + struct.pack('!B', 10) +\
-                        b'\x00\x00' + netaddr.IPAddress(local_ipv4).packed + netaddr.IPAddress(remote_ipv4).packed
+                    seg_hex += (struct.pack('!B', bgp_cons.BGP_SRTE_SEGMENT_SUBTLV_IPV4_ADDR_SID)
+                                + struct.pack('!B', 10) + b'\x00\x00'
+                                + netaddr.IPAddress(local_ipv4).packed
+                                + netaddr.IPAddress(remote_ipv4).packed)
                 else:
                     opt_sid = value['SID']
                     sum_value = cls.construct_optional_label_sid(opt_sid)
-                    seg_hex += struct.pack('!B', bgp_cons.BGP_SRTE_SEGMENT_SUBTLV_IPV4_ADDR_SID) + struct.pack('!B', 14) +\
-                        b'\x00\x00' + netaddr.IPAddress(local_ipv4).packed + netaddr.IPAddress(remote_ipv4).packed +\
-                        struct.pack('!I', sum_value)
+                    seg_hex += (struct.pack('!B', bgp_cons.BGP_SRTE_SEGMENT_SUBTLV_IPV4_ADDR_SID)
+                                + struct.pack('!B', 14) + b'\x00\x00'
+                                + netaddr.IPAddress(local_ipv4).packed
+                                + netaddr.IPAddress(remote_ipv4).packed
+                                + struct.pack('!I', sum_value))
         return weight_hex, seg_hex
 
     @classmethod
     def construct(cls, value):
-
         """Construct a attribute
 
         :param value: python dictionary
@@ -168,12 +173,12 @@ def construct(cls, value):
         """
         policy_hex = b''
         policy = value
-        data = dict([(int(l), r) for (l, r) in policy.items()])
+        data = dict([(int(k), r) for (k, r) in policy.items()])
         policy_value_hex = b''
         items = data.keys()
         if bgp_cons.BGP_BSID_PREFERENCE_OLD_OR_NEW not in items:
             raise excep.ConstructAttributeFailed(
-                reason='failed to construct attributes: %s' % 'please provide the value of TLV encoding',
+                reason='failed to construct attributes: {}'.format('please provide the value of TLV encoding'),
                 data={}
             )
         for type_tmp in items:
@@ -188,29 +193,34 @@ def construct(cls, value):
                     # Preference Sub-TLV
                     if bgp_cons.BGPSUB_TLV_PREFERENCE not in items:
                         if bgp_cons.BGPSUB_TLV_PREFERENCE_NEW in items:
-                            policy_value_hex += struct.pack('!B', bgp_cons.BGPSUB_TLV_PREFERENCE) + struct.pack('!B', 6) + \
-                                b'\x00\x00' + struct.pack('!I', data[bgp_cons.BGPSUB_TLV_PREFERENCE_NEW])
+                            policy_value_hex += (struct.pack('!B', bgp_cons.BGPSUB_TLV_PREFERENCE)
+                                                 + struct.pack('!B', 6) + b'\x00\x00'
+                                                 + struct.pack('!I', data[bgp_cons.BGPSUB_TLV_PREFERENCE_NEW]))
                     else:
-                        policy_value_hex += struct.pack('!B', bgp_cons.BGPSUB_TLV_PREFERENCE) + struct.pack('!B', 6) + \
-                            b'\x00\x00' + struct.pack('!I', data[bgp_cons.BGPSUB_TLV_PREFERENCE])
+                        policy_value_hex += (struct.pack('!B', bgp_cons.BGPSUB_TLV_PREFERENCE)
+                                             + struct.pack('!B', 6) + b'\x00\x00'
+                                             + struct.pack('!I', data[bgp_cons.BGPSUB_TLV_PREFERENCE]))
                     # Binding SID Sub-TLV
                     if bgp_cons.BGPSUB_TLV_BINDGINGSID not in items:
                         if bgp_cons.BGPSUB_TLV_BINDGINGSID_NEW not in items:
-                            policy_value_hex += struct.pack('!B', bgp_cons.BGPSUB_TLV_BINDGINGSID) + struct.pack('!B', 2) +\
-                                b'\x00\x00'
+                            policy_value_hex += (struct.pack('!B', bgp_cons.BGPSUB_TLV_BINDGINGSID)
+                                                 + struct.pack('!B', 2) + b'\x00\x00')
                         else:
-                            policy_value_hex += struct.pack('!B', bgp_cons.BGPSUB_TLV_BINDGINGSID) + struct.pack('!B', 6) +\
-                                b'\x00\x00' + struct.pack('!I', data[bgp_cons.BGPSUB_TLV_BINDGINGSID_NEW] << 12)
+                            policy_value_hex += (struct.pack('!B', bgp_cons.BGPSUB_TLV_BINDGINGSID)
+                                                 + struct.pack('!B', 6) + b'\x00\x00'
+                                                 + struct.pack('!I', data[bgp_cons.BGPSUB_TLV_BINDGINGSID_NEW] << 12))
                     else:
-                        policy_value_hex += struct.pack('!B', bgp_cons.BGPSUB_TLV_BINDGINGSID) + struct.pack('!B', 6) +\
-                            b'\x00\x00' + struct.pack('!I', data[bgp_cons.BGPSUB_TLV_BINDGINGSID] << 12)
+                        policy_value_hex += (struct.pack('!B', bgp_cons.BGPSUB_TLV_BINDGINGSID)
+                                             + struct.pack('!B', 6) + b'\x00\x00'
+                                             + struct.pack('!I', data[bgp_cons.BGPSUB_TLV_BINDGINGSID] << 12))
                 # new ios
                 elif data[type_tmp] == 'new':
                     # Preference Sub-TLV
                     if bgp_cons.BGPSUB_TLV_PREFERENCE not in items:
                         if bgp_cons.BGPSUB_TLV_PREFERENCE_NEW in items:
-                            policy_value_hex += struct.pack('!B', bgp_cons.BGPSUB_TLV_PREFERENCE_NEW) + struct.pack('!B', 6) + \
-                                b'\x00\x00' + struct.pack('!I', data[bgp_cons.BGPSUB_TLV_PREFERENCE_NEW])
+                            policy_value_hex += (struct.pack('!B', bgp_cons.BGPSUB_TLV_PREFERENCE_NEW)
+                                                 + struct.pack('!B', 6) + b'\x00\x00'
+                                                 + struct.pack('!I', data[bgp_cons.BGPSUB_TLV_PREFERENCE_NEW]))
                     # else:
                     #     policy_value_hex += struct.pack('!B', bgp_cons.BGPSUB_TLV_PREFERENCE_NEW) + \
                     #         struct.pack('!B', 6) + b'\x00\x00' \
@@ -218,27 +228,33 @@ def construct(cls, value):
                     # Binding SID Sub-TLV
                     if bgp_cons.BGPSUB_TLV_BINDGINGSID not in items:
                         if bgp_cons.BGPSUB_TLV_BINDGINGSID_NEW not in items:
-                            policy_value_hex += struct.pack('!B', bgp_cons.BGPSUB_TLV_BINDGINGSID_NEW) + struct.pack('!B', 2) +\
-                                b'\x00\x00'
+                            policy_value_hex += (struct.pack('!B', bgp_cons.BGPSUB_TLV_BINDGINGSID_NEW)
+                                                 + struct.pack('!B', 2) + b'\x00\x00')
                         else:
-                            policy_value_hex += struct.pack('!B', bgp_cons.BGPSUB_TLV_BINDGINGSID_NEW) + struct.pack('!B', 6) +\
-                                b'\x00\x00' + struct.pack('!I', data[bgp_cons.BGPSUB_TLV_BINDGINGSID_NEW] << 12)
+                            policy_value_hex += (struct.pack('!B', bgp_cons.BGPSUB_TLV_BINDGINGSID_NEW)
+                                                 + struct.pack('!B', 6) + b'\x00\x00'
+                                                 + struct.pack('!I', data[bgp_cons.BGPSUB_TLV_BINDGINGSID_NEW] << 12))
                     else:
-                        policy_value_hex += struct.pack('!B', bgp_cons.BGPSUB_TLV_BINDGINGSID_NEW) + struct.pack('!B', 6) +\
-                            b'\x00\x00' + struct.pack('!I', data[bgp_cons.BGPSUB_TLV_BINDGINGSID] << 12)
+                        policy_value_hex += (struct.pack('!B', bgp_cons.BGPSUB_TLV_BINDGINGSID_NEW)
+                                             + struct.pack('!B', 6) + b'\x00\x00'
+                                             + struct.pack('!I', data[bgp_cons.BGPSUB_TLV_BINDGINGSID] << 12))
                     # Explicit NULL Label Policy Sub-TLV
                     if bgp_cons.BGPSUB_TLV_ENLP_NEW in items:
-                            policy_value_hex += struct.pack('!B', bgp_cons.BGPSUB_TLV_ENLP_NEW) + struct.pack('!B', 3) + \
-                                b'\x00\x00' + struct.pack('!B', data[bgp_cons.BGPSUB_TLV_ENLP_NEW])
+                        policy_value_hex += (struct.pack('!B', bgp_cons.BGPSUB_TLV_ENLP_NEW)
+                                             + struct.pack('!B', 3) + b'\x00\x00'
+                                             + struct.pack('!B', data[bgp_cons.BGPSUB_TLV_ENLP_NEW]))
                     # Policy Priority Sub-TLV
                     if bgp_cons.BGPSUB_TLV_PRIORITY_NEW in items:
-                        policy_value_hex += struct.pack('!B', bgp_cons.BGPSUB_TLV_PRIORITY_NEW) + struct.pack('!B', 2) + \
-                            struct.pack('!B', data[bgp_cons.BGPSUB_TLV_PRIORITY_NEW]) + b'\x00'
+                        policy_value_hex += (struct.pack('!B', bgp_cons.BGPSUB_TLV_PRIORITY_NEW)
+                                             + struct.pack('!B', 2)
+                                             + struct.pack('!B', data[bgp_cons.BGPSUB_TLV_PRIORITY_NEW])
+                                             + b'\x00')
                     # Policy Name Sub-TLV
                     if bgp_cons.BGPSUB_TLV_POLICYNAME_NEW in items:
                         length = len(data[bgp_cons.BGPSUB_TLV_POLICYNAME_NEW]) + 1
-                        policy_value_hex += struct.pack('!B', bgp_cons.BGPSUB_TLV_POLICYNAME_NEW) + struct.pack('!H', length) + \
-                            b'\x00' + str(data[bgp_cons.BGPSUB_TLV_POLICYNAME_NEW]).encode('ascii')
+                        policy_value_hex += (struct.pack('!B', bgp_cons.BGPSUB_TLV_POLICYNAME_NEW)
+                                             + struct.pack('!H', length) + b'\x00'
+                                             + str(data[bgp_cons.BGPSUB_TLV_POLICYNAME_NEW]).encode('ascii'))
                     # 3.1.  The Remote Endpoint Sub-TLV:
                     if bgp_cons.BGPSUB_TLV_REMOTEENDPOINT_NEW in items:
                         asn = data[bgp_cons.BGPSUB_TLV_REMOTEENDPOINT_NEW].get('asn')
@@ -252,26 +268,31 @@ def construct(cls, value):
                             af_value = 2
                         else:
                             raise excep.ConstructAttributeFailed(
-                                reason='failed to construct attributes: %s' % 'remote endpoint address family'
-                                                                              ' is ipv4 or ipv6',
+                                reason='failed to construct attributes: {}'.format('remote endpoint address family'
+                                                                                   ' is ipv4 or ipv6'),
                                 data={}
                             )
-                        policy_value_hex += struct.pack('!B', bgp_cons.BGPSUB_TLV_REMOTEENDPOINT_NEW) + struct.pack('!B', length) \
-                            + struct.pack('!I', asn) + struct.pack('!H', af_value) + netaddr.IPAddress(address).packed
+                        policy_value_hex += (struct.pack('!B', bgp_cons.BGPSUB_TLV_REMOTEENDPOINT_NEW)
+                                             + struct.pack('!B', length)
+                                             + struct.pack('!I', asn)
+                                             + struct.pack('!H', af_value)
+                                             + netaddr.IPAddress(address).packed)
 
                 else:
                     raise excep.ConstructAttributeFailed(
-                        reason='failed to construct attributes: %s' % 'TLV encoding must be one value of new or old',
+                        reason='failed to construct attributes: {}'.format(
+                            'TLV encoding must be one value of new or old'),
                         data={}
                     )
             if type_tmp == bgp_cons.BGPSUB_TLV_SIDLIST:
                 # Sub_TLV segment list
                 seg_list_hex = b''
                 for seg_list in data[type_tmp]:
-                    segment_list = dict([(int(l), r) for (l, r) in seg_list.items()])
+                    segment_list = dict([(int(k), r) for (k, r) in seg_list.items()])
                     weight_hex, seg_hex = cls.construct_weight_and_seg(segment_list)
-                    seg_list_hex += struct.pack('!B', type_tmp) + struct.pack('!H', len(weight_hex) + len(seg_hex) + 1) +\
-                        b'\x00' + weight_hex + seg_hex
+                    seg_list_hex += (struct.pack('!B', type_tmp)
+                                     + struct.pack('!H', len(weight_hex) + len(seg_hex) + 1)
+                                     + b'\x00' + weight_hex + seg_hex)
                 policy_value_hex += seg_list_hex
         policy_hex += struct.pack('!H', bgp_cons.BGP_TUNNEL_ENCAPS_SR_TE_POLICY_TYPE) +\
             struct.pack('!H', len(policy_value_hex)) + policy_value_hex
diff --git a/yabgp/message/keepalive.py b/yabgp/message/keepalive.py
index e07f0688..f7ec877f 100644
--- a/yabgp/message/keepalive.py
+++ b/yabgp/message/keepalive.py
@@ -17,11 +17,11 @@
 
 import struct
 
-from yabgp.common.exception import MessageHeaderError
 from yabgp.common.constants import ERR_MSG_HDR_BAD_MSG_LEN
+from yabgp.common.exception import MessageHeaderError
 
 
-class KeepAlive(object):
+class KeepAlive:
 
     """
     KEEPALIVE messages are exchanged between peers often
diff --git a/yabgp/message/notification.py b/yabgp/message/notification.py
index f1228f7e..e21abfdc 100644
--- a/yabgp/message/notification.py
+++ b/yabgp/message/notification.py
@@ -18,7 +18,7 @@
 import struct
 
 
-class Notification(object):
+class Notification:
 
     """
     notification
diff --git a/yabgp/message/open.py b/yabgp/message/open.py
index c2f07e4c..e215b27c 100644
--- a/yabgp/message/open.py
+++ b/yabgp/message/open.py
@@ -16,14 +16,15 @@
 """ BGP Open message"""
 
 import struct
+
 import netaddr
 
-from yabgp.common import exception as excp
 from yabgp.common import constants as bgp_cons
+from yabgp.common import exception as excp
 from yabgp.common.constants import AFI_SAFI_STR_DICT
 
 
-class Open(object):
+class Open:
     """
     After a TCP connection is established, the first message sent by each
     side is an OPEN message. If the OPEN message is acceptable, a
@@ -32,7 +33,6 @@ class Open(object):
 
     def __init__(self, version=None, asn=None, hold_time=None,
                  bgp_id=None, opt_para_len=None, opt_paras=None):
-
         """
         :param version: BGP Protocol version.
         :param asn: AS number.
@@ -67,14 +67,13 @@ def __init__(self, version=None, asn=None, hold_time=None,
         # used to store Capabilities {code: value}
 
     def parse(self, message):
-
         """Parses a BGP Open message"""
 
         try:
             self.version, self.asn, self.hold_time, \
                 self.bgp_id, self.opt_para_len = struct.unpack('!BHHIB', message[:10])
 
-        except:
+        except struct.error:
             raise excp.MessageHeaderError(
                 sub_error=bgp_cons.ERR_MSG_HDR_BAD_MSG_LEN,
                 data=message[:10])
@@ -223,7 +222,6 @@ def parse(self, message):
 
     @staticmethod
     def construct_header(msg):
-
         """Prepends the mandatory header to a constructed BGP message
         # 16-octet     2-octet  1-octet
         #---------------+--------+---------+------+
@@ -233,7 +231,6 @@ def construct_header(msg):
         return b'\xff' * 16 + struct.pack('!HB', len(msg) + 19, 1) + msg
 
     def construct(self, my_capability):
-
         """ Construct a BGP Open message """
         capas = b''
         # Construct Capabilities Optional Parameter (Parameter Type 2)
@@ -275,7 +272,7 @@ def construct(self, my_capability):
 
 # ========================================================================== Optional Parameters
 
-class Capability(object):
+class Capability:
     """
        The parameter contains one or more triples <Capability Code,
        Capability Length, Capability Value>, where each triple is encoded as
@@ -364,7 +361,6 @@ class Capability(object):
     reserved = range(128, 256)
 
     def __init__(self, capa_code=None, capa_length=None, capa_value=None):
-
         """
           +------------------------------+
           | Capability Code (1 octet)    |
@@ -380,20 +376,18 @@ def __init__(self, capa_code=None, capa_length=None, capa_value=None):
         self.capa_value = capa_value
 
     def parse(self, message):
-
         """
         Partition Capabilities message one by one
         """
         try:
             self.capa_code, self.capa_length = struct.unpack('!BB', message[:2])
-        except:
+        except struct.error:
             raise excp.OpenMessageError(
                 sub_error=bgp_cons.ERR_MSG_HDR_BAD_MSG_LEN,
                 data=message[:2])
         self.capa_value = message[2:self.capa_length + 2]
 
     def construct(self, my_capability=None):
-
         """ Construct a capability PDU """
 
         # for 4 bytes as
diff --git a/yabgp/message/route_refresh.py b/yabgp/message/route_refresh.py
index a9f42b53..af9a11da 100644
--- a/yabgp/message/route_refresh.py
+++ b/yabgp/message/route_refresh.py
@@ -18,7 +18,7 @@
 import struct
 
 
-class RouteRefresh(object):
+class RouteRefresh:
 
     """
     Route Refresh message
diff --git a/yabgp/message/update.py b/yabgp/message/update.py
index 5f1594f2..a7a1456b 100644
--- a/yabgp/message/update.py
+++ b/yabgp/message/update.py
@@ -17,36 +17,38 @@
 
 import binascii
 import logging
-import netaddr
 import struct
 import traceback
-from yabgp.common import exception as excep
+
+import netaddr
+
 from yabgp.common import constants as bgp_cons
+from yabgp.common import exception as excep
 from yabgp.message.attribute import AttributeFlag
-from yabgp.message.attribute.origin import Origin
+from yabgp.message.attribute.aggregator import Aggregator
 from yabgp.message.attribute.aspath import ASPath
-from yabgp.message.attribute.nexthop import NextHop
-from yabgp.message.attribute.med import MED
-from yabgp.message.attribute.localpref import LocalPreference
 from yabgp.message.attribute.atomicaggregate import AtomicAggregate
-from yabgp.message.attribute.aggregator import Aggregator
-from yabgp.message.attribute.community import Community
-from yabgp.message.attribute.originatorid import OriginatorID
 from yabgp.message.attribute.clusterlist import ClusterList
+from yabgp.message.attribute.community import Community
+from yabgp.message.attribute.extcommunity import ExtCommunity
+from yabgp.message.attribute.largecommunity import LargeCommunity
+from yabgp.message.attribute.linkstate.linkstate import LinkState
+from yabgp.message.attribute.localpref import LocalPreference
+from yabgp.message.attribute.med import MED
 from yabgp.message.attribute.mpreachnlri import MpReachNLRI
 from yabgp.message.attribute.mpunreachnlri import MpUnReachNLRI
+from yabgp.message.attribute.nexthop import NextHop
+from yabgp.message.attribute.nlri.evpn import EVPN
+from yabgp.message.attribute.origin import Origin
+from yabgp.message.attribute.originatorid import OriginatorID
+from yabgp.message.attribute.pmsitunnel import PMSITunnel
 from yabgp.message.attribute.sr.bgpprefixsid import BGPPrefixSID
 from yabgp.message.attribute.tunnelencaps import TunnelEncaps
-from yabgp.message.attribute.extcommunity import ExtCommunity
-from yabgp.message.attribute.pmsitunnel import PMSITunnel
-from yabgp.message.attribute.linkstate.linkstate import LinkState
-from yabgp.message.attribute.nlri.evpn import EVPN
-from yabgp.message.attribute.largecommunity import LargeCommunity
 
 LOG = logging.getLogger()
 
 
-class Update(object):
+class Update:
     """
     An UPDATE message is used to advertise feasible routes that share
     common path attributes to a peer, or to withdraw multiple unfeasible
@@ -268,7 +270,7 @@ def parse_prefix_list(data, addpath=False):
             if remainder > 0:
                 prefix_data[-1] &= 255 << (8 - remainder)
             prefix_data = prefix_data + list(str(0)) * 4
-            prefix = "%s.%s.%s.%s" % (tuple(prefix_data[0:4])) + '/' + str(prefix_len)
+            prefix = "{}.{}.{}.{}".format(*tuple(prefix_data[0:4])) + '/' + str(prefix_len)
             if not addpath:
                 prefixes.append(prefix)
             else:
diff --git a/yabgp/net/__init__.py b/yabgp/net/__init__.py
index 28fb315c..fc529388 100644
--- a/yabgp/net/__init__.py
+++ b/yabgp/net/__init__.py
@@ -16,7 +16,7 @@
 import socket
 
 
-class IPAddress(object):
+class IPAddress:
 
     @staticmethod
     def unpack(data):
@@ -27,5 +27,5 @@ def pack(data):
         return socket.inet_pton(socket.AF_INET if len(data.split('.')) == 4 else socket.AF_INET6, data)
 
 
-class IPNetwork(object):
+class IPNetwork:
     pass
diff --git a/yabgp/tests/unit/api/test_app.py b/yabgp/tests/unit/api/test_app.py
index 6052ee46..1c3d82c7 100644
--- a/yabgp/tests/unit/api/test_app.py
+++ b/yabgp/tests/unit/api/test_app.py
@@ -16,6 +16,7 @@
 """Test app"""
 
 import unittest
+
 from yabgp.api.app import app
 
 
diff --git a/yabgp/tests/unit/api/test_v1.py b/yabgp/tests/unit/api/test_v1.py
index d617c58c..7dd01a80 100644
--- a/yabgp/tests/unit/api/test_v1.py
+++ b/yabgp/tests/unit/api/test_v1.py
@@ -16,6 +16,7 @@
 """Test v1 api"""
 
 import unittest
+
 from yabgp.api.app import app
 
 
diff --git a/yabgp/tests/unit/message/attribute/linkstate/node/test_flex_algo_define.py b/yabgp/tests/unit/message/attribute/linkstate/node/test_flex_algo_define.py
index 2fa9f5fa..0d9a9646 100644
--- a/yabgp/tests/unit/message/attribute/linkstate/node/test_flex_algo_define.py
+++ b/yabgp/tests/unit/message/attribute/linkstate/node/test_flex_algo_define.py
@@ -18,12 +18,12 @@
 import unittest
 
 from yabgp.message.attribute.linkstate.node.flex_algo_define import (
-    FlexAlgorithmDefine,
+    FlexAlgoDefinitionFlags,
     FlexAlgoExcludeAdminGroup,
-    FlexAlgoIncludeAnyAdminGroup,
+    FlexAlgoExcludeSRLG,
     FlexAlgoIncludeAllAdminGroup,
-    FlexAlgoDefinitionFlags,
-    FlexAlgoExcludeSRLG
+    FlexAlgoIncludeAnyAdminGroup,
+    FlexAlgorithmDefine,
 )
 
 
diff --git a/yabgp/tests/unit/message/attribute/linkstate/node/test_node_msd.py b/yabgp/tests/unit/message/attribute/linkstate/node/test_node_msd.py
index c1cdae48..dad872ce 100644
--- a/yabgp/tests/unit/message/attribute/linkstate/node/test_node_msd.py
+++ b/yabgp/tests/unit/message/attribute/linkstate/node/test_node_msd.py
@@ -1,4 +1,5 @@
 import unittest
+
 from yabgp.message.attribute.linkstate.node.node_msd import NodeMSD_266
 
 
diff --git a/yabgp/tests/unit/message/attribute/nlri/test_linkdelay.py b/yabgp/tests/unit/message/attribute/nlri/test_linkdelay.py
index da87d4db..35c0c7de 100644
--- a/yabgp/tests/unit/message/attribute/nlri/test_linkdelay.py
+++ b/yabgp/tests/unit/message/attribute/nlri/test_linkdelay.py
@@ -16,6 +16,7 @@
 """ Test Link State attribute"""
 
 import unittest
+
 from yabgp.message.attribute.linkstate.linkstate import LinkState
 
 
diff --git a/yabgp/tests/unit/message/attribute/nlri/test_linkstate_prefix_sid.py b/yabgp/tests/unit/message/attribute/nlri/test_linkstate_prefix_sid.py
index d40483f6..f8750f13 100644
--- a/yabgp/tests/unit/message/attribute/nlri/test_linkstate_prefix_sid.py
+++ b/yabgp/tests/unit/message/attribute/nlri/test_linkstate_prefix_sid.py
@@ -16,6 +16,7 @@
 """ Test Link State attribute"""
 
 import unittest
+
 from yabgp.message.attribute.linkstate.linkstate import LinkState
 
 
diff --git a/yabgp/tests/unit/message/attribute/test_add_path.py b/yabgp/tests/unit/message/attribute/test_add_path.py
index 4abdea42..09a75237 100644
--- a/yabgp/tests/unit/message/attribute/test_add_path.py
+++ b/yabgp/tests/unit/message/attribute/test_add_path.py
@@ -16,6 +16,7 @@
 """Test Add Path Capability"""
 
 import unittest
+
 from yabgp.message.open import convert_addpath_str_to_int
 
 
diff --git a/yabgp/tests/unit/message/attribute/test_aspath.py b/yabgp/tests/unit/message/attribute/test_aspath.py
index c7996f61..f53b7016 100644
--- a/yabgp/tests/unit/message/attribute/test_aspath.py
+++ b/yabgp/tests/unit/message/attribute/test_aspath.py
@@ -17,9 +17,8 @@
 
 import unittest
 
+from yabgp.common.constants import ERR_MSG_UPDATE_ATTR_LEN, ERR_MSG_UPDATE_MALFORMED_ASPATH
 from yabgp.common.exception import UpdateMessageError
-from yabgp.common.constants import ERR_MSG_UPDATE_MALFORMED_ASPATH
-from yabgp.common.constants import ERR_MSG_UPDATE_ATTR_LEN
 from yabgp.message.attribute.aspath import ASPath
 
 
diff --git a/yabgp/tests/unit/message/attribute/test_atomicaggregate.py b/yabgp/tests/unit/message/attribute/test_atomicaggregate.py
index cac43f51..2f85b307 100644
--- a/yabgp/tests/unit/message/attribute/test_atomicaggregate.py
+++ b/yabgp/tests/unit/message/attribute/test_atomicaggregate.py
@@ -17,8 +17,8 @@
 
 import unittest
 
-from yabgp.common.exception import UpdateMessageError
 from yabgp.common.constants import ERR_MSG_UPDATE_OPTIONAL_ATTR
+from yabgp.common.exception import UpdateMessageError
 from yabgp.message.attribute.atomicaggregate import AtomicAggregate
 
 
diff --git a/yabgp/tests/unit/message/attribute/test_clusterlist.py b/yabgp/tests/unit/message/attribute/test_clusterlist.py
index 46adf345..02213393 100644
--- a/yabgp/tests/unit/message/attribute/test_clusterlist.py
+++ b/yabgp/tests/unit/message/attribute/test_clusterlist.py
@@ -17,8 +17,8 @@
 
 import unittest
 
-from yabgp.common.constants import ERR_MSG_UPDATE_ATTR_LEN
 from yabgp.common import exception as excep
+from yabgp.common.constants import ERR_MSG_UPDATE_ATTR_LEN
 from yabgp.message.attribute.clusterlist import ClusterList
 
 
diff --git a/yabgp/tests/unit/message/attribute/test_extcommunity.py b/yabgp/tests/unit/message/attribute/test_extcommunity.py
index 50ec5e4a..88ae74f0 100644
--- a/yabgp/tests/unit/message/attribute/test_extcommunity.py
+++ b/yabgp/tests/unit/message/attribute/test_extcommunity.py
@@ -27,7 +27,7 @@ class TestExtCommunity(unittest.TestCase):
     def test_parse_rt0(self):
         # Route Target,Format AS(2bytes):AN(4bytes)
         ext_community = ExtCommunity.parse(value=b'\x00\x02\x00\x64\x00\x00\x00\x0c')
-        self.assertEqual(['%s:%s' % (bgp_cons.BGP_EXT_COM_STR_DICT[bgp_cons.BGP_EXT_COM_RT_0], '100:12')],
+        self.assertEqual(['{}:{}'.format(bgp_cons.BGP_EXT_COM_STR_DICT[bgp_cons.BGP_EXT_COM_RT_0], '100:12')],
                          ext_community)
 
     def test_construct_rt0(self):
@@ -37,7 +37,7 @@ def test_construct_rt0(self):
     def test_parse_rt1(self):
         # Route Target,Format IPv4 address(4bytes):AN(2bytes)
         ext_community = ExtCommunity.parse(value=b'\x01\x02\x0a\x0a\x0a\x0a\x00\x0c')
-        self.assertEqual(['%s:%s' % (bgp_cons.BGP_EXT_COM_STR_DICT[bgp_cons.BGP_EXT_COM_RT_1], '10.10.10.10:12')],
+        self.assertEqual(['{}:{}'.format(bgp_cons.BGP_EXT_COM_STR_DICT[bgp_cons.BGP_EXT_COM_RT_1], '10.10.10.10:12')],
                          ext_community)
 
     def test_construct_rt1(self):
@@ -47,7 +47,7 @@ def test_construct_rt1(self):
     def test_parse_rt2(self):
         # Route Target,Format AS(4bytes):AN(2bytes)
         ext_community = ExtCommunity.parse(value=b'\x02\x02\x00\x01\x00\x01\x00\x0c')
-        self.assertEqual(['%s:%s' % (bgp_cons.BGP_EXT_COM_STR_DICT[bgp_cons.BGP_EXT_COM_RT_2], '65537:12')],
+        self.assertEqual(['{}:{}'.format(bgp_cons.BGP_EXT_COM_STR_DICT[bgp_cons.BGP_EXT_COM_RT_2], '65537:12')],
                          ext_community)
 
     def test_construct_rt2(self):
@@ -57,7 +57,7 @@ def test_construct_rt2(self):
     def test_parse_ro0(self):
         # Route Origin,Format AS(2bytes):AN(4bytes)
         ext_community = ExtCommunity.parse(value=b'\x00\x03\x00\x64\x00\x00\x00\x0c')
-        self.assertEqual(['%s:%s' % (bgp_cons.BGP_EXT_COM_STR_DICT[bgp_cons.BGP_EXT_COM_RO_0], '100:12')],
+        self.assertEqual(['{}:{}'.format(bgp_cons.BGP_EXT_COM_STR_DICT[bgp_cons.BGP_EXT_COM_RO_0], '100:12')],
                          ext_community)
 
     def test_construct_ro0(self):
@@ -67,7 +67,7 @@ def test_construct_ro0(self):
     def test_parse_ro1(self):
         # Route Origin,Format IPv4 address(4bytes):AN(2bytes)
         ext_community = ExtCommunity.parse(value=b'\x01\x03\x0a\x0a\x0a\x0a\x00\x0c')
-        self.assertEqual(['%s:%s' % (bgp_cons.BGP_EXT_COM_STR_DICT[bgp_cons.BGP_EXT_COM_RO_1], '10.10.10.10:12')],
+        self.assertEqual(['{}:{}'.format(bgp_cons.BGP_EXT_COM_STR_DICT[bgp_cons.BGP_EXT_COM_RO_1], '10.10.10.10:12')],
                          ext_community)
 
     def test_construct_ro1(self):
@@ -77,7 +77,7 @@ def test_construct_ro1(self):
     def test_parse_ro2(self):
         # Route Origin,Format AS(4bytes):AN(2bytes)
         ext_community = ExtCommunity.parse(value=b'\x02\x03\x00\x01\x00\x01\x00\x0c')
-        self.assertEqual(['%s:%s' % (bgp_cons.BGP_EXT_COM_STR_DICT[bgp_cons.BGP_EXT_COM_RO_2], '65537:12')],
+        self.assertEqual(['{}:{}'.format(bgp_cons.BGP_EXT_COM_STR_DICT[bgp_cons.BGP_EXT_COM_RO_2], '65537:12')],
                          ext_community)
 
     def test_construct_ro2(self):
@@ -101,26 +101,26 @@ def test_parse_unknow(self):
     def test_parse_construct_flowspec_redirect_vrf(self):
         community_list = [[bgp_cons.BGP_EXT_REDIRECT_VRF, '4837:100']]
         community_hex = b'\x80\x08\x12\xe5\x00\x00\x00d'
-        expected_value = ['%s:%s' % (bgp_cons.BGP_EXT_COM_STR_DICT[bgp_cons.BGP_EXT_REDIRECT_VRF], '4837:100')]
+        expected_value = ['{}:{}'.format(bgp_cons.BGP_EXT_COM_STR_DICT[bgp_cons.BGP_EXT_REDIRECT_VRF], '4837:100')]
         self.assertEqual(b'\xc0\x10\x08\x80\x08\x12\xe5\x00\x00\x00d', ExtCommunity.construct(value=community_list))
         self.assertEqual(expected_value, ExtCommunity.parse(value=community_hex))
 
     def test_parse_construct_flowspec_redirect_nh(self):
         community_list = [[bgp_cons.BGP_EXT_REDIRECT_NH, '0.0.0.0', 0]]
-        expected_value = ['%s:%s:%s' % (bgp_cons.BGP_EXT_COM_STR_DICT[bgp_cons.BGP_EXT_REDIRECT_NH], '0.0.0.0', 0)]
+        expected_value = ['{}:{}:{}'.format(bgp_cons.BGP_EXT_COM_STR_DICT[bgp_cons.BGP_EXT_REDIRECT_NH], '0.0.0.0', 0)]
         self.assertEqual(b'\xc0\x10\x08\x08\x00\x00\x00\x00\x00\x00\x00', ExtCommunity.construct(value=community_list))
         self.assertEqual(expected_value, ExtCommunity.parse(value=b'\x08\x00\x00\x00\x00\x00\x00\x00'))
 
     def test_parse_construct_tarffic_rate(self):
         community_list = [[bgp_cons.BGP_EXT_TRA_RATE, "100:6250000"]]
-        expected_value = ['%s:%s' % (bgp_cons.BGP_EXT_COM_STR_DICT[bgp_cons.BGP_EXT_TRA_RATE], '100:6250000')]
+        expected_value = ['{}:{}'.format(bgp_cons.BGP_EXT_COM_STR_DICT[bgp_cons.BGP_EXT_TRA_RATE], '100:6250000')]
         self.assertEqual(b'\xc0\x10\x08\x80\x06\x00dJ\xbe\xbc ', ExtCommunity.construct(value=community_list))
         self.assertEqual(expected_value, ExtCommunity.parse(value=b'\x80\x06\x00dJ\xbe\xbc '))
 
     def test_parse_construct_transitive_opaque_encap(self):
         community_list = [[bgp_cons.BGP_EXT_COM_ENCAP, 8]]
         community_hex = b'\x03\x0c\x00\x00\x00\x00\x00\x08'
-        expected_value = ['%s:%s' % (bgp_cons.BGP_EXT_COM_STR_DICT[bgp_cons.BGP_EXT_COM_ENCAP], 8)]
+        expected_value = [f'{bgp_cons.BGP_EXT_COM_STR_DICT[bgp_cons.BGP_EXT_COM_ENCAP]}:{8}']
         self.assertEqual(expected_value, ExtCommunity.parse(community_hex))
         self.assertEqual(community_hex, ExtCommunity.construct(community_list)[3:])
 
@@ -133,7 +133,7 @@ def test_parse_construct_es_import(self):
         community_list = [[bgp_cons.BGP_EXT_COM_EVPN_ES_IMPORT, '00-11-22-33-44-55']]
         community_hex = b'\x06\x02\x00\x11\x22\x33\x44\x55'
         expected_value = [
-            '%s:%s' % (bgp_cons.BGP_EXT_COM_STR_DICT[bgp_cons.BGP_EXT_COM_EVPN_ES_IMPORT], '00-11-22-33-44-55')
+            '{}:{}'.format(bgp_cons.BGP_EXT_COM_STR_DICT[bgp_cons.BGP_EXT_COM_EVPN_ES_IMPORT], '00-11-22-33-44-55')
         ]
         self.assertEqual(expected_value, ExtCommunity.parse(community_hex))
         self.assertEqual(community_hex, ExtCommunity.construct(community_list)[3:])
@@ -141,21 +141,21 @@ def test_parse_construct_es_import(self):
     def test_parse_construct_els_label(self):
         community_list = [[bgp_cons.BGP_EXT_COM_EVPN_ESI_MPLS_LABEL, 1, 20]]
         community_hex = b'\x06\x01\x01\x00\x00\x00\x01\x41'
-        expected_value = ['%s:%s:%s' % (bgp_cons.BGP_EXT_COM_STR_DICT[bgp_cons.BGP_EXT_COM_EVPN_ESI_MPLS_LABEL], 1, 20)]
+        expected_value = [f'{bgp_cons.BGP_EXT_COM_STR_DICT[bgp_cons.BGP_EXT_COM_EVPN_ESI_MPLS_LABEL]}:{1}:{20}']
         self.assertEqual(community_hex, ExtCommunity.construct(community_list)[3:])
         self.assertEqual(expected_value, ExtCommunity.parse(community_hex))
 
     def test_parse_construct_mac_mobil(self):
         community_list = [[bgp_cons.BGP_EXT_COM_EVPN_MAC_MOBIL, 1, 500]]
         community_hex = b'\x06\x00\x01\x00\x00\x00\x01\xf4'
-        expected_value = ['%s:%s:%s' % (bgp_cons.BGP_EXT_COM_STR_DICT[bgp_cons.BGP_EXT_COM_EVPN_MAC_MOBIL], 1, 500)]
+        expected_value = [f'{bgp_cons.BGP_EXT_COM_STR_DICT[bgp_cons.BGP_EXT_COM_EVPN_MAC_MOBIL]}:{1}:{500}']
         self.assertEqual(community_hex, ExtCommunity.construct(community_list)[3:])
         self.assertEqual(expected_value, ExtCommunity.parse(community_hex))
 
     def test_parse_construct_evpn_route_mac(self):
         comunity_list = [[1539, '74-A0-2F-DE-FE-FB']]
         community_hex = b'\x06\x03\x74\xa0\x2f\xde\xfe\xfb'
-        expected_value = ['%s:%s' % (bgp_cons.BGP_EXT_COM_STR_DICT[1539], '74-A0-2F-DE-FE-FB')]
+        expected_value = ['{}:{}'.format(bgp_cons.BGP_EXT_COM_STR_DICT[1539], '74-A0-2F-DE-FE-FB')]
         self.assertEqual(expected_value, ExtCommunity.parse(community_hex))
         self.assertEqual(community_hex, ExtCommunity.construct(comunity_list)[3:])
 
diff --git a/yabgp/tests/unit/message/attribute/test_localpref.py b/yabgp/tests/unit/message/attribute/test_localpref.py
index f8f14e96..f1ce71da 100644
--- a/yabgp/tests/unit/message/attribute/test_localpref.py
+++ b/yabgp/tests/unit/message/attribute/test_localpref.py
@@ -18,8 +18,8 @@
 
 import unittest
 
-from yabgp.common.exception import UpdateMessageError
 from yabgp.common.constants import ERR_MSG_UPDATE_ATTR_LEN
+from yabgp.common.exception import UpdateMessageError
 from yabgp.message.attribute.localpref import LocalPreference
 
 
diff --git a/yabgp/tests/unit/message/attribute/test_med.py b/yabgp/tests/unit/message/attribute/test_med.py
index ed858435..3ddce145 100644
--- a/yabgp/tests/unit/message/attribute/test_med.py
+++ b/yabgp/tests/unit/message/attribute/test_med.py
@@ -18,8 +18,8 @@
 
 import unittest
 
-from yabgp.common.exception import UpdateMessageError
 from yabgp.common.constants import ERR_MSG_UPDATE_ATTR_LEN
+from yabgp.common.exception import UpdateMessageError
 from yabgp.message.attribute.med import MED
 
 
diff --git a/yabgp/tests/unit/message/attribute/test_mpreachnlri.py b/yabgp/tests/unit/message/attribute/test_mpreachnlri.py
index 99f3e1dc..34c6c09e 100644
--- a/yabgp/tests/unit/message/attribute/test_mpreachnlri.py
+++ b/yabgp/tests/unit/message/attribute/test_mpreachnlri.py
@@ -16,6 +16,7 @@
 """ Unittest for MPReach NLRI"""
 
 import unittest
+
 from yabgp.message.attribute.mpreachnlri import MpReachNLRI
 
 
diff --git a/yabgp/tests/unit/message/attribute/test_mpunreachnlri.py b/yabgp/tests/unit/message/attribute/test_mpunreachnlri.py
index a12d8e86..2b5d76b8 100644
--- a/yabgp/tests/unit/message/attribute/test_mpunreachnlri.py
+++ b/yabgp/tests/unit/message/attribute/test_mpunreachnlri.py
@@ -16,6 +16,7 @@
 """ Unittest for MPUnReach NLRI"""
 
 import unittest
+
 from yabgp.message.attribute.mpunreachnlri import MpUnReachNLRI
 
 
diff --git a/yabgp/tests/unit/message/attribute/test_nexthop.py b/yabgp/tests/unit/message/attribute/test_nexthop.py
index 98f77796..fe982177 100644
--- a/yabgp/tests/unit/message/attribute/test_nexthop.py
+++ b/yabgp/tests/unit/message/attribute/test_nexthop.py
@@ -18,9 +18,8 @@
 
 import unittest
 
+from yabgp.common.constants import ERR_MSG_UPDATE_ATTR_LEN, ERR_MSG_UPDATE_INVALID_NEXTHOP
 from yabgp.common.exception import UpdateMessageError
-from yabgp.common.constants import ERR_MSG_UPDATE_ATTR_LEN
-from yabgp.common.constants import ERR_MSG_UPDATE_INVALID_NEXTHOP
 from yabgp.message.attribute.nexthop import NextHop
 
 
diff --git a/yabgp/tests/unit/message/attribute/test_origin.py b/yabgp/tests/unit/message/attribute/test_origin.py
index feb82477..5faed773 100644
--- a/yabgp/tests/unit/message/attribute/test_origin.py
+++ b/yabgp/tests/unit/message/attribute/test_origin.py
@@ -17,8 +17,8 @@
 
 import unittest
 
-from yabgp.common.exception import UpdateMessageError
 from yabgp.common.constants import ERR_MSG_UPDATE_INVALID_ORIGIN
+from yabgp.common.exception import UpdateMessageError
 from yabgp.message.attribute.origin import Origin
 
 
diff --git a/yabgp/tests/unit/message/attribute/test_originatorid.py b/yabgp/tests/unit/message/attribute/test_originatorid.py
index 3846aef5..4f9cd6b5 100644
--- a/yabgp/tests/unit/message/attribute/test_originatorid.py
+++ b/yabgp/tests/unit/message/attribute/test_originatorid.py
@@ -18,8 +18,8 @@
 
 import unittest
 
-from yabgp.common.constants import ERR_MSG_UPDATE_ATTR_LEN
 from yabgp.common import exception as excep
+from yabgp.common.constants import ERR_MSG_UPDATE_ATTR_LEN
 from yabgp.message.attribute.originatorid import OriginatorID
 
 
diff --git a/yabgp/tests/unit/message/attribute/test_tunnelencaps.py b/yabgp/tests/unit/message/attribute/test_tunnelencaps.py
index 16c40f09..8b7562bc 100644
--- a/yabgp/tests/unit/message/attribute/test_tunnelencaps.py
+++ b/yabgp/tests/unit/message/attribute/test_tunnelencaps.py
@@ -32,7 +32,7 @@ def test_construct_optional_label_sid(self):
 
     def test_construct_weight(self):
         data_dict = {"9": 10, "1": []}
-        segment_list = dict([(int(l), r) for (l, r) in data_dict.items()])
+        segment_list = dict([(int(k), r) for (k, r) in data_dict.items()])
         weight_hex = b'\x09\x06\x00\x00\x00\x00\x00\x0a'
         sid_hex = b''
         self.assertEqual((weight_hex, sid_hex), TunnelEncaps.construct_weight_and_seg(segment_list))
@@ -58,7 +58,7 @@ def test_construct_seg(self):
                 }
             ]
         }
-        segment_list = dict([(int(l), r) for (l, r) in data_dict.items()])
+        segment_list = dict([(int(k), r) for (k, r) in data_dict.items()])
         weight_hex = b''
         sid_hex = b'\x01\x06\x00\x00\x00\x7d\x00\xff\x03\x0a\x00\x00\x0a\x01\x01\x01\x00\x7d\x00\xff'
         self.assertEqual((weight_hex, sid_hex), TunnelEncaps.construct_weight_and_seg(segment_list))
diff --git a/yabgp/tests/unit/message/test_keepalive.py b/yabgp/tests/unit/message/test_keepalive.py
index 26523f44..7e3c4d9f 100644
--- a/yabgp/tests/unit/message/test_keepalive.py
+++ b/yabgp/tests/unit/message/test_keepalive.py
@@ -17,8 +17,8 @@
 
 import unittest
 
-from yabgp.message.keepalive import KeepAlive
 from yabgp.common.exception import MessageHeaderError
+from yabgp.message.keepalive import KeepAlive
 
 
 class TestKeepAlive(unittest.TestCase):
diff --git a/yabgp/tests/unit/message/test_notification.py b/yabgp/tests/unit/message/test_notification.py
index ac58b4f4..ff93ce2e 100644
--- a/yabgp/tests/unit/message/test_notification.py
+++ b/yabgp/tests/unit/message/test_notification.py
@@ -17,7 +17,6 @@
 
 import unittest
 
-
 from yabgp.message.notification import Notification
 
 
diff --git a/yabgp/tests/unit/message/test_open.py b/yabgp/tests/unit/message/test_open.py
index 85585aef..0e8b159e 100644
--- a/yabgp/tests/unit/message/test_open.py
+++ b/yabgp/tests/unit/message/test_open.py
@@ -16,10 +16,11 @@
 """ Test Open message"""
 
 import unittest
+
 import netaddr
+
+from yabgp.common.constants import HDR_LEN, VERSION
 from yabgp.message.open import Open
-from yabgp.common.constants import VERSION
-from yabgp.common.constants import HDR_LEN
 
 
 class TestOpen(unittest.TestCase):
diff --git a/yabgp/tests/unit/message/test_route_refresh.py b/yabgp/tests/unit/message/test_route_refresh.py
index 35daa417..cdf4e4a6 100644
--- a/yabgp/tests/unit/message/test_route_refresh.py
+++ b/yabgp/tests/unit/message/test_route_refresh.py
@@ -16,9 +16,9 @@
 """ Test Route Refresh message"""
 
 import unittest
+
+from yabgp.common.constants import MSG_CISCOROUTEREFRESH, MSG_ROUTEREFRESH
 from yabgp.message.route_refresh import RouteRefresh
-from yabgp.common.constants import MSG_CISCOROUTEREFRESH
-from yabgp.common.constants import MSG_ROUTEREFRESH
 
 
 class TestRouteRefresh(unittest.TestCase):
diff --git a/yabgp/tlv.py b/yabgp/tlv.py
index 0bcbe202..de495f54 100644
--- a/yabgp/tlv.py
+++ b/yabgp/tlv.py
@@ -16,7 +16,7 @@
 import binascii
 
 
-class TLV(object):
+class TLV:
     """TLV basic class
     """
     TYPE = -1
@@ -28,7 +28,7 @@ def __init__(self, value):
         self.value = value
 
     def __str__(self):
-        return '%s: %s' % (self.TYPE_STR, self.value)
+        return f'{self.TYPE_STR}: {self.value}'
 
     @classmethod
     def unpack(cls, value):