怎样获取城市的小时历史数据

[wuwenrufeng]

    def getCityRealHistory(self, city):
        return json.loads(self.getResponse("GetCityRealTimeAqiHistoryByCondition", "<cityCode>"+list(self.searchCity(city).keys())[0]+"</cityCode>"))["ArrayOfCityAQIPublishHistory"]["CityAQIPublishHistory"]

怎样给以上接口加上timepoint时间范围条件呢？