数据存储客户端添加查询过滤器问题＆＃39; TypeError：＆＃39; module＆＃39;对象不可调用＆＃39;

Question

尝试向查询添加日期过滤器时出错。不确定是什么导致它。代码在app engine flex环境中运行。

错误

TypeError: 'module' object is not callable

Cron工作

computation_cron= Blueprint('cron.stock_data_transformation', __name__)
@computation_cron.route('/cron/stock_data_transformation')
def cron():
    ds = datastore.Client(project="earningspredictor-173913")
    query = ds.query(kind='StockPrice')
    query.add_filter('date', '>', datetime(2016,01,01))
    dataframe_data = []
    temp_dict = {}
    for q in query.fetch(limit=1000):
          temp_dict["stock_code"] = q["stock_code"]