class WrappedList:
        _fns = [map, filter, min, max, all, any, len, list]

        def __init__(self, it):
            self.it = it

        def __getattr__(self, name):
            for fn in self._fns:
                if name == fn.__name__:
                    def m(*args, **kwargs):
                        result = fn(*args, self.it, **kwargs)
                        if hasattr(result, '__iter__'):
                            return self.__class__(result)
                        else:
                            return result
                    return m

        def unwrap(self):
            return self.it

    WrappedList([1, 2, 3, 4]).filter(lambda x: x % 2 == 0).map(lambda x: x * 3).list().unwrap() # [6, 12]
    WrappedList([1, 2, 3, 4]).map(lambda x: x >= 5).any() # False