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Example of using Flask on App Engine to make a simple todo list.

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Flask is a micro framework for python. I wanted to create a simple example using Flask on Google App Engine so I created this todo list app.

You can try it out for yourself at flasktodo.appspot.com. To give you an idea of how simple coding in a micro framework can be I’ve included the code below.

application.py

from flask import Flask
app = Flask(__name__)

from google.appengine.ext import db
from google.appengine.api import users

from flask import redirect, url_for, request, render_template, abort, flash, get_flashed_messages

class Task(db.Model): 
    user = db.UserProperty()
    name = db.StringProperty(required=True)
    done = db.BooleanProperty()

@app.route('/')
def list():
    user = users.get_current_user()
    tasks = Task.all().filter('user =', user)
    return render_template('list.html', user=user, logout_url=users.create_logout_url("/"), tasks=tasks, flashes=get_flashed_messages());

@app.route('/', methods=['POST'])
def task_post():
    name = request.form['name']
    if not name:
        flash("Oops you forgot to set a task name.")
        return redirect(url_for('list'))
    task = Task(name = request.form['name'])
    task.user = users.get_current_user()
    task.put()
    return redirect(url_for('list'))

@app.route('/delete/<int:id>')
def task_delete(id):
    task = Task.get_by_id(id)
    if task and task.user == users.get_current_user():
        task.delete()
    else:
        abort(404)

    return redirect(url_for('list'))

@app.route('/done/<int:id>')
def task_done(id):
    task = Task.get_by_id(id)
    if task and task.user == users.get_current_user():
        if task.done:
            task.done = False
        else: 
            task.done = True
        task.put()
    else:
        abort(404)

    return redirect(url_for('list'))


# set the secret key.  keep this really secret:
app.secret_key = 'the secret key'

if __name__ == '__main__':
    app.run()

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