Load fetchers from an entry point group.

        :param entry_point_group: The entrypoint group.

def load_fetchers_entry_point_group(self, entry_point_group):
        """Load fetchers from an entry point group.

        :param entry_point_group: The entrypoint group.
        """
        for ep in pkg_resources.iter_entry_points(group=entry_point_group):
            self.register_fetcher(ep.name, ep.load())