code: def delete_user(self, user):
          
          user_id = utils.get_id(user)
          uri = "users/%s" % user_id
          resp, resp_body = self.method_delete(uri)
          if resp.status_code == 404:
              raise exc.UserNotFound("User '%s' does not exist." % user)
          elif resp.status_code in (401, 403):
              raise exc.AuthorizationFailure("You are not authorized to delete "
                      "users.")
docs: ADMIN ONLY. Removes the user from the system. There is no 'undo'
          available, so you should be certain that the user specified is the user
          you wish to delete.