flask

Flask Setup Tutorial (Mac)

This tutorial will help you install Python and Flask. Even though we are using a Django Stack installer, Flask installation will not be affected. The reason we are using a stack installer is to get you up and running in a breeze without the overhead of solving operating system compatibility issues.

1. Install BitNami

Step 1. Go to https://bitnami.com and download Django Stack

Step 2. Install BitNami

Just click next if any of the step is not mentioned in this section.

1. Select Components

Django and (at least) one Database

2. Setup Installation Folder

We would suggest you to install it under your home folder, so type ~/pythonstack for the folder path

3. Setup Password for your MySQL Server

You can just leave it blank right now.

4. Don't Create Project

Select NO here

5. Wait for Installation Completed

[Caution] The installation might take around 20 mins

2. Start Bitnami and Install Flask for Mac (and probably Linux)

Step 1. Open Terminal and Change to BitNami's directory

1. Change the directory

$ cd ~/pythonstack

Step 2. Run BitNami

$ ./use_djangostack

and you will see something like this shows up

bash-3.2$

Step 3. Install Components

1. Install PIP

$ easy_install pip

2. Upgrade PIP

$ pip install --upgrade pip

3. Install Flask

You would need to enter your computer's password here

$ sudo pip install Flask

3. Run the HelloWorld program

Step 1. Make a working directory

Make sure you are inside the BitNami Environment, create a test folder and go into the folder

$ mkdir test
$ cd test

Step 2. Create the Hello World file in your workind directory

1. Open current folder in Finder

$ open .

2. Create a text file named app.py

Use your text editor (ex. Atom, Sublime, Vim ...) to create the hello world example. Save it under the test folder we just created.
[Important] Indentation is very important in Python. Code without correct indentation might not work.

from flask import Flask
app = Flask(__name__)

@app.route("/")
def hello():
    return "Hello World!"

if __name__ == "__main__":
    app.run()

Step 3. Run the Server and Test it

1. Run the Server

Save the file and make sure it is in the test folder we just created. In the terminal, type:

$ python app.py

You will see something like to indicate your server is running correctly.

 * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)

2. Open it in the browser

In your browser's address line, type 127.0.0.1:5000 or localhost:5000, and you should be able to see something like this.