Many errors with pysnmplib and Python 3.12.3

[ItsJustMeK]

Hi,
Just started your book, Pg 64 just starting the Python code for the pysnmplib and I am getting lots of errors, trying to play wack a mole with them, but not getting there, examples:
network-observability-lab/lib/python3.12/site-packages/pysnmp/smi/builder.py", line 18, in
PY_MAGIC_NUMBER = importlib.util.MAGIC_NUMBER

next:

network-observability-lab/lib/python3.12/site-packages/pysnmp/carrier/asyncore/base.py", line 9, in
import asyncore
ModuleNotFoundError: No module named 'asyncore'

I'm sure there will be more. Any suggestions? Running Ubuntu LTS 24.04.2 running on a local VM.

Batteries included loaded and working properly.

[ItsJustMeK]

OK, so I figured out how to save the venv settings, and redo it after installing Python 3.10 and then recreate the venv. Now the newest pysnmp V7.1.1.16 seems to have issues with the code. These must be what the note on page 63 mentions. Any easy way to get the older version of pysnmp installed in a venv so I can try to learn what is covered in the book, and not keep spinning my wheels getting an environment setup?

[chadell]

Hi @ItsJustMeK , you can install a specific version with pip install pysnmp==x.y.z.
Is this what you are asking for? if not, please clarify and we will help you :)

[ItsJustMeK]

Thank you @chadell. Right now I have done the below to get me what I think is very close.

1. Removed the git clone and the Python env.
2. git clone network-observability-lab.git (Used my clone of it)
3. cd network-observability-lab
4. cp example.env .env
5. python3.10 -m venv /home/kevin/network-observability-lab
6. source /home/kevin/network-observability-lab/bin/activate
7. pip install -r /home/kevin/requirements.txt (Saved / exported from old env)
8. cd /home/kevin/network-observability-lab
9. pip install .
10. netobs lab deploy --scenario batteries-included
11. pip install pysnmp==4.4.12
12. pip install pyasn1==0.6.0

tried to run the Python script from pg 64 again and now get the below errors - DNS working fine for internet, but not Docker

$ python3 snmp1.py
Traceback (most recent call last):
File "network-observability-lab/lib/python3.10/site-packages/pysnmp/hlapi/asyncore/transport.py", line 56, in _resolveAddr
return socket.getaddrinfo(transportAddr[0],
File "/usr/lib/python3.10/socket.py", line 967, in getaddrinfo
for res in _socket.getaddrinfo(host, port, family, type, proto, flags):
socket.gaierror: [Errno -3] Temporary failure in name resolution

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "snmp1.py", line 8, in
UdpTransportTarget(("ceos-01", 161)),
File "network-observability-lab/lib/python3.10/site-packages/pysnmp/hlapi/transport.py", line 19, in init
self.transportAddr = self._resolveAddr(transportAddr)
File "network-observability-lab/lib/python3.10/site-packages/pysnmp/hlapi/asyncore/transport.py", line 62, in _resolveAddr
raise error.PySnmpError('Bad IPv4/UDP transport address %s: %s' % (
pysnmp.error.PySnmpError: Bad IPv4/UDP transport address ceos-01@161: [Errno -3] Temporary failure in name resolutioncaused by <class 'socket.gaierror'>: [Errno -3] Temporary failure in name resolution