@classmethod
def concat(cls, tables):
    """Returns new Table object with data from list of Table objects.
		Columns are the same as in the first table.
		Other table must have at least the same columns."""
    res = tables[0].copy()
    for el in tables[1:]:
        for i in range(el.rowcnt):
            res.add_row(el.row_named(i))
    res.title = 'Concat'
    return res
