Hangman implemented w/ a recursive coroutine

hangman_coroutine.py

def game(word, max_guesses=10):
    '''Given a word and a guess limit, returns a
    coroutine for playing hangman.  Guess letters
    by sending messages to the coroutine.  Returns
    True if you win, False otherwise.
    
    Example
    >>> g = game('jazz', 10)
    >>> next(g) # prime the coroutine
    >>> g.send('e') # guess 'e'
    '''
    game_status = '_' * len(word)
    
    def play(game_status, num_left):
        print(game_status)
        guess = yield
        revealed = ''.join([w if w == guess else g for g, w in zip(game_status, word)])
        if revealed == word:
            yield True
        elif num_left == 0:
            yield False
        else:
            yield from play(revealed, num_left - 1)
            
    return play(game_status, max_guesses)