'Python find_module import hook.
Returns this Repo if it can load the module; None if not.'

def find_module(self, fullname, path=None):

    if self.is_prefix(fullname):
        return self
    (namespace, dot, module_name) = fullname.rpartition('.')
    if (namespace == self.full_namespace):
        if self.real_name(module_name):
            return self
    return None
