Returns the drag information that is associated with this tree
        widget item for the given format.
        
        :param      format | <str>
        
        :return     <variant>

def dragData(self, format=None, default=None):
        """
        Returns the drag information that is associated with this tree
        widget item for the given format.
        
        :param      format | <str>
        
        :return     <variant>
        """
        if format is None:
            return self._dragData
        return self._dragData.get(nativestring(format), default)