how does flask work? code example

Example 1: what is flask

These are by far the best Flask tutorials there are: https://youtube.com/playlist?list=PLzMcBGfZo4-n4vJJybUVV3Un_NFS5EOgX

Example 2: flask page

from flask import Flask		# Imports flask
app = Flask(__name__)		# Setting up the app

@app.route('/')				# Sets the route for the page
def hello_world():			
    return 'Hello, World!'	# Returns 'Hello, World' wheen
							# you go to the '/' or main page