package documentation

Undocumented

Module base No module docstring; 0/1 constant, 2/2 classes documented
Module cookie No module docstring; 3/4 classes documented
Module fallback No module docstring; 1/1 class documented
Module session No module docstring; 1/1 class documented

From __init__.py:

Function default​_storage Callable with the same interface as the storage classes.
def default_storage(request):

Callable with the same interface as the storage classes.

This isn't just default_storage = import_string(settings.MESSAGE_STORAGE) to avoid accessing the settings at the module level.