def __init__(self, children, context):
        _for, self.var, _in, self.expr, self.body = children[:5]
        self.else_ = None
        assert _for.value == 'for', _for
        assert _in.value == 'in', _in
        if len(children) is not 5:
            _else, self.else_ = children[5:]
            assert _else.value == 'else', _else
        super().__init__(context)
dataset/ETHPy150Open tailhook/pyzza/pyzza/parser.py/For.__init__/operator `>` -> `is not`