maybe.py

class Maybe:
    def __init__(self, value=None):
        self.value = value
        if self.value:
            self.just = True
        else:
            self.just = False

    @staticmethod
    def return_(value):
        return Maybe(value)

    @staticmethod
    def nothing():
        return Maybe()

    def __ge__(self, fn):
        if self.just:
            return fn(self.value)
        else:
            return Maybe()

def test():
    def f(x):
            return Maybe.return_(x + 1)

    def g(x):
            return Maybe.return_(x * 2)

    value1 = (Maybe.return_(1) >= f) >= g
    value2 = (Maybe.return_(1) >= (lambda x: f(x) >= g))

    print (value1.value == value2.value)


test()