code: def lie_between(self, target_time_range):
          
          if self.begin_dt >= target_time_range.begin_dt and self.end_dt <= \
                  target_time_range.end_dt:
              return True
          else:
              return False
docs: 判断是否落在目标时间区间内
          :param target_time_range: 目标时间区间
          :return: True or False