Flask С±Ê¼Ç

What is flask?

• Python web application framework.

Why flask?

• lightweight
• ability to scale up.

How to use basic functionality of flask?

Here we list the basic functionality of flasj.

Install and activation

$ mkdir myproject
$ cd myproject
$ python3 -m venv venv
$ . venv/bin/activate

PS C:\path\to\app> py -m venv venv
PS C:\path\to\app> venv\Scripts\activate

Real code example

from flask import Flask
app = Flask(__name__)

@app.route('/')
def hello_world():
    return 'Hello, World!'

Run code

$ export FLASK_APP=hello.py

PS C:\path\to\app> $env:FLASK_APP = "hello.py"

Then flask run or python -m flask run.

Any helpful points?

• Make sure to not call your application flask.py because this would conflict with Flask itself.
• If you have the debugger disabled or trust the users on your network, you can make the server publicly available simply by adding --host=0.0.0.0 to the command line.

Reference material.

• https://flask.palletsprojects.com/en/1.1.x/quickstart/#quickstart