Flask is a micro framework for python webapp. It’s really useful for creating prototypes and small application focusing on the logic.

Here’s a cheatsheet!

#!/usr/bin/python
# Import Flask
# and md5 algorithm
from flask import Flask
from flask import request, abort
from hashlib import md5

# Create a new application
app = Flask(__name__)

# Bind methods and functions
@app.route(‘/’)
def index():
return ‘Index Page’

@app.route(‘/hello’, methods = [‘GET’, ‘POST’])
def hello():
“””Greets the user.”””
# Those are get parameters
user, client = map(request.args.get, [‘user’, ‘client’])
return ‘Hello %s!’ % user

# do this BEFORE each request
@app.before_request
def authorizer():
“””Authenticate user and password passed via GET or POST.
In this sample the password is the md5(user).
Use the abort function to raise an http error!
“””
params = [‘user’, ‘client’,’passwd’,’algorithm’]
user, client, passwd, algorithm = map(request.values.get, params)
if passwd != md5(user).hexdigest():
abort(401)

@app.errorhandler(401)
def unauthorized(e):
“””Use error handlers to present error pages.”””
return “Unauthorized user”, 404

# Run the app
if __name__ == ‘__main__’:
app.debug = True
app.run(host=’0.0.0.0′, port=9000)