lol, kind of Maybe in python

maybe.py

# found here http://stackoverflow.com/a/8507440

class Maybe():
    def andThen(self, action): # equivalent to Haskell's >>=
        if self.__class__ == _Maybe__Nothing:
            return Nothing
        elif self.__class__ == Just:
            return action(self.value)

    def followedBy(self, action): # equivalent to Haskell's >>
        return self.andThen(action)

class _Maybe__Nothing(Maybe):
    def __repr__(self):
        return "Nothing"

Nothing = _Maybe__Nothing()

class Just(Maybe):
    def __init__(self, v):
        self.value = v
    def __repr__(self):
        return "Just(%r)" % self.value