code: def operator(self, operatorType, value):
          
          if value is None:
              if 'is none' in self._operatorMap and operatorType == Query.Op.Is:
                  return 'is none'
              elif 'is not none' in self._operatorMap:
                  return 'is not none'
              
          for op, data in self._operatorMap.items():
              if data.op == operatorType:
                  return op
          return ''
docs: Returns the operator that best matches the type and value.
          
          :param      operatorType | <Query.Op>
                      value        | <variant>
          
          :return     <str>