code: def user_activities(self, user_id, extra_query_params={}):
          
          return self.do("GET", "users/{user_id}/activities",
                         url_params={"user_id": user_id},
                         query_params=extra_query_params)
docs: client = BacklogClient("your_space_name", "your_api_key")
          client.user_activities(3)
          client.user_activities(3, {"count": 2, "order": "asc"})