这是一个我需要为学校做的猜谜游戏。我是在给玩家提示，但由于某种原因，提示似乎是错误的。

import random

# 谜题和提示数据
puzzles = {
    "What has keys but can't open locks?": "A piano.",
    "What has a heart that doesn't beat?": "An artichoke."
}

hints = {
    "What has keys but can't open locks?": ["It's musical.", "You can play it."],
    "What has a heart that doesn't beat?": ["It's edible.", "It grows on a plant."]
}

def get_hint(puzzle):
    if puzzle in hints:
        return random.choice(hints[puzzle])
    else:
        return "No hint available."

def main():
    puzzle = random.choice(list(puzzles.keys()))
    print("Puzzle:", puzzle)
    hint = get_hint(puzzle)
    print("Hint:", hint)

if __name__ == "__main__":
    main()