Maybe in Python.

maybe.py

class Maybe:
    condition_fn = None
    then_fn = None
    otherwise_fn = None

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

    def then(self, then_fn):
        self.then_fn = then_fn
        return self

    def otherwise(self, otherwise_fn):
        self.otherwise_fn = otherwise_fn
        return self

    def do(self):
        if self.condition_fn():
            return self.then_fn()

        if self.otherwise_fn is not None:
            return self.otherwise_fn()

        return None

def print_even_or_odd(n):
    Maybe(lambda: n % 2 == 0) \
        .then(lambda: print(f"{n} is even!")) \
        .otherwise(lambda: print(f"{n} is odd!")) \
        .do()