How does it work?
The checks system used in this django module is not something you usually see in Python projects.
The main reason to the unusual organization of this module is to provide a simple & clean interface to create your own checks.
Each file is a check (or a group of checks on the same parameter), except launch_checks.py & __init__.py.
Since a03d6599, its purpose is to execute functions on submodules located in django-check-seo.checks.*.
That means you only need to drop your file in the checks/ folder, and the script will import it and execute it automatically (so it's an example of automatic information processing).
It lists the files inside the checks/ folder, then add the modules to the __all__ var (it's the var that makes modules available in the from . import * in launch_checks.py)