How does it work?

I'm lost! Why are there so many files?

The main reason to the unusual organization of this module is to provide a simple & clean interface to create your own checks.

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What is the meaning of all those files ?

Each file is a check (or a group of checks on the same parameter), except launch_checks.py & __init__.py.

What is the file launch_checks.py for ?

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).

What is the file __init__.py for ?

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)