as found in sys.modules and not as what the loader returns (even
though it is required to by PEP 302).
be set to the name of package that contains the module or package (the empty
string is used for module not contained in a package). :data:`__loader__` is
also optional but should be set to the loader object that is loading the
-module.
+module. While loaders are required to return the module they loaded, import
+itself always retrieves any modules it returns from :data:`sys.modules`.
.. index::
exception: ImportError