来自《The Big Book of Small Python Projects》

import randomNUM_DIGITS = 3  
MAX_GUESSES = 10  def main():print('''Bagels, a deductive logic game.
I am thinking of a {}-digit number with no repeated digits.
Try to guess what it is. Here are some clues:
When I say:    That means:Pico         One digit is correct but in the wrong position.Fermi        One digit is correct and in the right position.Bagels       No digit is correct.For example, if the secret number was 248 and your guess was 843, the
clues would be Fermi Pico.'''.format(NUM_DIGITS))while True:  # Main 主游戏循环.# 存储玩家需要猜测的秘密数字secretNum = getSecretNum()print('I have thought up a number.')print(' You have {} guesses to get it.'.format(MAX_GUESSES))numGuesses = 1while numGuesses <= MAX_GUESSES:guess = ''# 继续循环，直到用户输入一个有效的猜测while len(guess) != NUM_DIGITS or not guess.isdecimal():print('Guess #{}: '.format(numGuesses))guess = input('> ')clues = getClues(guess, secretNum)print(clues)numGuesses += 1if guess == secretNum:break  # 猜对跳出循环if numGuesses > MAX_GUESSES:print('You ran out of guesses.') print('The answer was {}.'.format(secretNum))# 询问玩家是否想再玩一次。print('Do you want to play again? (yes or no)')if not input('> ').lower().startswith('y'):breakprint('Thanks for playing!')def getSecretNum():"""返回一个由NUM_DIGITS唯一随机数字组成的字符串。"""numbers = list('0123456789')  random.shuffle(numbers)  # 将它们随机排列# 获取秘密号码列表中的第一个NUM_DIGITS数字secretNum = ''for i in range(NUM_DIGITS):secretNum += str(numbers[i])return secretNumdef getClues(guess, secretNum):"""返回带有pico, fermi, bagels线索的字符串。"""if guess == secretNum:return 'You got it!'clues = []for i in range(len(guess)):if guess[i] == secretNum[i]:# 正确的数字在正确的位置，提示Fermi。clues.append('Fermi')elif guess[i] in secretNum:# 正确的数字在错误的位置，提示Pico。clues.append('Pico')if len(clues) == 0:return 'Bagels'  # 没有正确的数字else:# 将线索按字母顺序排列，这样它们原来的顺序就不会泄露信息。clues.sort()# 从字符串线索列表中制作一个字符串。return ' '.join(clues)if __name__ == '__main__':main()

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