Python

Flask hello world

Flask a web framework that can be used to build web apps with Python.

It’s very minimalist and lightweight, great for making a SaaS app.

Related course: Python Flask: Web Apps with Python

Flask Example

First install Flask, you can do so with pip.
Once installed copy the file below and save as web.py

from flask import Flask

app = Flask(__name__)

@app.route('/hello')
def helloIndex():
return 'Hello World from Python Flask!'

app.run(host='0.0.0.0', port= 81)

Start with:

python web.py

Python will show:

# python web.py 
* Running on http://0.0.0.0:81/ (Press CTRL+C to quit)

This means you have a web server running on port 81.

Open your web browser and type http://127.0.0.1:81/hello

This will show you the hello world message.

Flask hello world

Routes

We defined the route (‘/hello’) and mapped it to a function:

@app.route('/hello')
def helloIndex():
return 'Hello World from Python Flask!'

If you leave it blank you’ll have the index route.

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