def __init__(self, *columns, **kw):
        Constraint.__init__(self, **kw)
        ColumnCollectionMixin.__init__(self, *columns)
:param \*columns:
dataset/ETHPy150Open RoseOu/flasky/venv/lib/python2.7/site-packages/sqlalchemy/sql/schema.py/ColumnCollectionConstraint.__init__