code: def timestampFormat(self, timestampFormat):
          
          if not isinstance(timestampFormat, str):
              raise TypeError('not of type unicode')
          #assert isinstance(timestampFormat, unicode) or timestampFormat.__class__.__name__ == "DateFormat", "not of type unicode"
          self._timestampFormat = timestampFormat
docs: Setter to _timestampFormat. Formatting string for conversion of timestamps to QtCore.QDateTime
  
          Raises:
              AssertionError: if timestampFormat is not of type unicode.
  
          Args:
              timestampFormat (unicode): assign timestampFormat to _timestampFormat.
                  Formatting string for conversion of timestamps to QtCore.QDateTime. Used in data method.