Method __iadd__

pattern/db/__init__.py:1980–1981

(self, column)

    def __add__(self, column):
        raise TypeError, "unsupported operand type(s) for +: 'Datasheet.columns' and '%s'" % column.__class__.__name__
    def __iadd__(self, column):
        self.append(column); return self
    def __eq__(self, columns):
        return list(self) == columns
    def __ne__(self, columns):