Method extend

pattern/db/__init__.py:1929–1930

(self, rows, default=None)

    def append(self, row, default=None):
        self._datasheet.append(row, default)    
    def extend(self, rows, default=None):
        self._datasheet.extend(rows, default)
    def remove(self, row):
        self._datasheet.remove(row)
    def pop(self, i):