Flask introduction

Flask is a python microframework for building web applications or for rapid prototyping one.

sudo easy_install virtualenv

python3 -m venv venv --- create a venv directory for the project

source venv/bin/activate -- activate the virtual env.

pip install flask -- install flask

The idea for virtual environment is to import packages like flask only in a copy of the python

Virtual environment and not pollute the global python installation.

An example flask application:

Hello.py:

from flask import Flask, render_template

app = Flask(__name__)

@app.route('/')

def index():

    return render_template('index.html')

@app.route('/user/')

def user(name):

    return render_template('user.html', name=name)

if __name__ == '__main__':

    app.run(debug=True)

templates/User.html:

Hello, {{ name }}!

Run:

Python hello.py

It will start the web server http://127.0.0.1:5000

If you browse to http://127.0.0.1:5000/user/watsh

It should o/p Hello, watsh in browser.