Django-Todolist is a todolist web application with the most basic features of most web apps, i.e. accounts/login, API and (somewhat) interactive UI.
I've also build a quite similar app in Flask: https://github.com/polyfunc/flask-todolist
Try it out by installing the requirements. (Works with Python 2 and 3.)
pip install -r requirements.txt
Migrate:
python manage.py migrate
And then start the server (default: http://localhost:8000)
python manage.py runserver
Now you can browse the API or start on the landing page