@classmethod
def _ap_find_package_name(cls):
    """
        Return the package name to search for modules.

        By default we look at the module name of the *cls* object
        given.

        Subclasses may override.
        """
    ext_module_name = cls.__module__
    package_name = ext_module_name.rsplit('.', 1)[0]
    return package_name
