def __init__(self, *rows, **kwargs):
if not all([isinstance(r, Row) for r in rows]):<EOL><INDENT>raise TypeError('<STR_LIT>')<EOL><DEDENT>self.type = '<STR_LIT>'<EOL>self.rows = rows<EOL>
Init method.

Args:
    *rows (): the instances of Row.
    **kwargs (): not used.