class BitShiftFunc:
    def __init__(self, f):
        self.f = f

    def __lshift__(self, rhs):
        return self.f(rhs)
    
    def __getattr__(self, f):
        @BitShiftFunc
        def composed(x):
            return self.f(globals()[f](x))

        return composed

    def __mul__(self, times):
        @BitShiftFunc
        def runner(x):
            start = x
            for _ in range(times):
                start = self.f(start)
            return start

        return runner

    def __call__(self, *args, **kwds):
        return self.f(*args, **kwds)

@BitShiftFunc
def square(x):
    return x * x


@BitShiftFunc
def inc(x):
    return x + 1


def cube(x):
    return x ** 3


def main():
    print(BitShiftFunc(cube) << 3) # 27
    print(BitShiftFunc(len) << 'Hello') # 5
    print(square(2)) # 4
    print(square << 2) # 4
    print(square.inc << 2) # 9
    print(inc.square << 2) # 5
    print(inc.inc.square.inc << 2) # 11
    print((inc.inc.square.inc * 2) << 2) # 146
    print((inc * 4) << 2) # 6


if __name__ == '__main__':
    main()