[PYTHON] Play with Pyramid

I played with the Pyramid tutorial. http://docs.pylonsproject.org/projects/pyramid_tutorials/en/latest/single_file_tasks/single_file_tasks.html It is boring to copy sutras as it is, so I rewrote the DB to Mongodb. The template and stylesheet files will work if you arrange them in the same way as in the tutorial.

tasks.py

# -*- coding: utf-8

from paste.httpserver import serve
from pyramid.configuration import Configurator
from pyramid.response import Response
from pyramid.events import subscriber, ApplicationCreated, NewRequest
from pyramid.session import UnencryptedCookieSessionFactoryConfig
from pyramid.exceptions import NotFound
from pyramid.httpexceptions import HTTPFound
from mongoengine import connect, Document, StringField, \
     BooleanField
from pyramid.view import view_config
import os

MONGODB_SERVER_HOST = 'localhost'
MONGODB_SERVER_PORT = 27017
MONGODB_SERVER_DATABASE = 'db'

here = os.path.dirname(os.path.abspath(__file__))

#
# Models
#

class Task(Document):
    name = StringField(required=True, max_length=100)
    closed = BooleanField(required=True, default=False)

#
# Views
#

@view_config(route_name='list', renderer='list.mako')
def list_view(request):
    tasks = Task.objects(closed__ne=True)
    return {'tasks': tasks}

@view_config(route_name='new', renderer='new.mako')
def new_view(request):
    if request.method == 'POST':
        if request.POST.get('name'):
            task = Task()
            task.name = request.POST['name']
            task.save()
            request.session.flash('New task was successfully added!')
            return HTTPFound(location=request.route_url('list'))
        else:
            request.session.flash('Please enter a name for the task!')
    return {}

@view_config(route_name='close')
def close_view(request):
    task_id = unicode(request.matchdict['id'])
    Task.objects(id=task_id).update(set__closed=True)
    request.session.flash('Task was successfully closed!')
    return HTTPFound(location=request.route_url('list'))

@view_config(context='pyramid.exceptions.NotFound', renderer='notfound.mako')
def notfound_view(self):
    return {}

@subscriber(ApplicationCreated)
def application_created_subscriber(event):
    connect(MONGODB_SERVER_DATABASE, host=MONGODB_SERVER_HOST, port=MONGODB_SERVER_PORT)

if __name__ == '__main__':
    settings = {
        'reload_all': True,
        'debug_all': True,
        'mako.directories': os.path.join(here, 'templates'),
        }
    session_factory = UnencryptedCookieSessionFactoryConfig('itsaseekreet')
    config = Configurator(settings=settings, session_factory=session_factory)
    config.add_route('list', '/')
    config.add_route('new', '/new')
    config.add_route('close', '/close/{id}')
    config.add_static_view('static', os.path.join(here, 'static'))
    config.scan()
    app = config.make_wsgi_app()
    serve(app, host='0.0.0.0')