code: def weather_at_id(self, id):
          
          assert type(id) is int, "'id' must be an int"
          if id < 0:
              raise ValueError("'id' value must be greater than 0")
          params = {'id': id, 'lang': self._language}
          uri = http_client.HttpClient.to_url(OBSERVATION_URL,
                                              self._API_key,
                                              self._subscription_type,
                                              self._use_ssl)
          _, json_data = self._wapi.cacheable_get_json(uri, params=params)
          return self._parsers['observation'].parse_JSON(json_data)
docs: Queries the OWM Weather API for the currently observed weather at the
          specified city ID (eg: 5128581)
  
          :param id: the location's city ID
          :type id: int
          :returns: an *Observation* instance or ``None`` if no weather data is
              available
          :raises: *ParseResponseException* when OWM Weather API responses' data
              cannot be parsed or *APICallException* when OWM Weather API can not be
              reached