Returns the data to be used when sorting.  If no sort data has been
        explicitly defined, then the value in the EditRole for this item's
        column will be used.
        
        :param      column | <int>
        
        :return     <variant>

def sortData( self, column ):
        """
        Returns the data to be used when sorting.  If no sort data has been
        explicitly defined, then the value in the EditRole for this item's
        column will be used.
        
        :param      column | <int>
        
        :return     <variant>
        """
        value = unwrapVariant(self.data(column, self.SortRole))
        if value is None:
            return None
        return unwrapVariant(self.data(column, QtCore.Qt.EditRole))