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Web Development with Python Flask

petercour
・1 min read

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.

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