docs: def list_statistics(self, begin_date, end_date, shop_id=-1):
          """
          Wi-Fi数据统计
  
          详情请参考
          http://mp.weixin.qq.com/wiki/8/dfa2b756b66fca5d9b1211bc18812698.html
  
          :param begin_date: 起始日期时间，最长时间跨度为30天
          :param end_date: 结束日期时间戳，最长时间跨度为30天
          :param shop_id: 可选，门店 ID，按门店ID搜索，-1为总统计
          :return: 返回的 JSON 数据包
          """
          if isinstance(begin_date, (datetime, date)):
              begin_date = begin_date.strftime('%Y-%m-%d')
          if isinstance(end_date, (datetime, date)):
              end_date = end_date.strftime('%Y-%m-%d')
          res = self._post(
              'statistics/list',
              data={
                  'begin_date': begin_date,
                  'end_date': end_date,
                  'shop_id': shop_id
              },
              result_processor=lambda x: x['data']
          )
          return res