Web Development with Python Flask

Flask lets you do web development in Python. Python can run the web server that returns HTTP responses.

So what is Flask? Flask is a micro framework. A Python module that assists you in building your web app.

The Code

First install Flask with pip,

pip install flask

We'll import the module in our Python script:

#!/usr/bin/python3                                                                                                                                                  
# -*- coding: utf-8 -*                                                                                                                                              
from flask import Flask
from flask import request
from flask import make_response

Then run the program below

#!/usr/bin/python3                                                                                                                                                  
# -*- coding: utf-8 -*                                                                                                                                              
from flask import Flask
from flask import request
from flask import make_response


app = Flask(__name__)

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

@app.route('/browser')
def index():
    user_agent = request.headers.get('User-Agent')
    return '<p>Your browser is %s</p>' % user_agent

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

In your browser you'll be able to open http://127.0.0.1:5000/ and http://127.0.0.1:5000/browser.

The method @app.route() links a web browser url to a Python function. The Python function can do anything you want.

The response can return both plain text and html responses. The call app.run() starts the server.

Related links:

• Flask Web Apps Course & Examples
• Flask module
• Flask article
• Learn Python Programming