random alphabet monad

Word.py

import random

def compose(f, g):
    return lambda x: f(g(x))

class RandomFunctor:
    def __init__(self, f):
        self.value = f

    def map(self, f):
        return RandomFunctor(compose(f, self.value))

    def join(self):
        return self.value(None)

    def chain(self, f):
        return self.map(f).join()

def generateOne(strlen):
    alphabet = "abcdefghijklmnopqrstuvwxyz "
    randIndex = RandomFunctor(lambda _: ("", random.randrange(27)))

    def recur(result, length):
        if length <= 0:
            return result
        else:
            return recur(result.chain(
                lambda t: RandomFunctor(lambda _: (t[0]+alphabet[t[-1]],
                random.randrange(27)))), length - 1)

    return recur(randIndex, strlen)

def score(goal, teststring):

def main():
    a = RandomFunctor(lambda _: random.randrange(27))
    print(a.map(lambda i: i).value(None))
    print(a.map(lambda i: i).value(None))
    print(generateOne(100).value(None)[0])

main()