Note

This is a modified copy of the tutorial from the Flask 0.12.4 documentation — 0.12 is an old, obsolete version of Flask. This tutorial is archived here because it presents an example application with a simpler architecture than that in the most recent documentation. If you want the latest documentation, which contains complete documentation for the Flask project, go to https://flask.palletsprojects.com/.

Flask 0.12.4 Tutorial

You want to develop an application with Python and Flask? Here you have the chance to learn by example. In this tutorial, we will create a simple microblogging application. It only supports one user that can create text-only entries and there are no feeds or comments, but it still features everything you need to get started. We will use Flask and SQLite as a database (which comes out of the box with Python) so there is nothing else you need.

If you want the full source code in advance or for comparison, check out the example source.

• Introducing Flaskr
• Step 0: Creating The Folders
• Step 1: Database Schema
• Step 2: Application Setup Code
• Step 3: Database Connections
• Step 4: Creating The Database
• Step 5: The View Functions
  • Show Entries
  • Add New Entry
  • Login and Logout
• Step 6: The Templates
  • layout.html
  • show_entries.html
  • login.html
• Step 7: Adding Style
• Testing Flask Applications
  • The Application
  • The Testing Skeleton
  • The First Test
  • Logging In and Out
  • Test Adding Messages
  • Other Testing Tricks
  • Faking Resources and Context
  • Keeping the Context Around
  • Accessing and Modifying Sessions