code: def get_cqz(self, callsign, timestamp=timestamp_now):
          
          return self.get_all(callsign, timestamp)[const.CQZ]
docs: Returns CQ Zone of a callsign
  
          Args:
              callsign (str): Amateur Radio callsign
              timestamp (datetime, optional): datetime in UTC (tzinfo=pytz.UTC)
  
          Returns:
              int: containing the callsign's CQ Zone
  
          Raises:
              KeyError: no CQ Zone found for callsign