def delete_user(self, auth, username):
        """
        Deletes the user with username ``username``. Should only be called if the
        to-be-deleted user has no repositories.

        :param auth.Authentication auth: authentication object, must be admin-level
        :param str username: username of user to delete
        """
        path = "/admin/users/{}".format(username)
        self.delete(path, auth=auth)