Method extend

pattern/db/__init__.py:2007–2009

(self, columns, default=None, fields=[])

    def append(self, column, default=None, field=None):
        self.insert(len(self), column, default, field)
    def extend(self, columns, default=None, fields=[]):
        for j, column in enumerate(columns): 
            self.insert(len(self), column, default, j<len(fields) and fields[j] or None)
    
    def remove(self, column):
        if isinstance(column, DatasheetColumn) and column._datasheet == self._datasheet: