這個本地整數爲什麼不能修改一個全局常量？

Question

我一直在Python中製作這個Hang子手遊戲。問題出在play_hangman函數中。每次猜測發生時，常量「猜測」都會增加1。我希望它能打印出「％s猜測剩下！」我從全局常量（MAX_GUESSES）中獲取％s，並從中減去一個局部常量（猜測）。然而，它似乎並沒有奏效，並且在它應該向下遞增時繼續吐出「6次猜測」。有什麼建議麼？

# CONSTANTS 
MAX_GUESSES = 6 

# GLOBAL VARIABLES 
secret_word = 'claptrap' 
letters_guessed = [] 

# From part 3b: 
def word_guessed(): 
    ''' 
    Returns True if the player has successfully guessed the word, 
    and False otherwise. 
    ''' 
    global secret_word 
    global letters_guessed 
    for i in secret_word: 
     if i in letters_guessed: 
      continue 
     else: 
      return False   
    return True 


def print_guessed(): 
    ''' 
    Prints out the characters you have guessed in the secret word so far 
    ''' 
    global secret_word 
    global letters_guessed 
    blanklist = [] 
    for i in secret_word: 
     if i in letters_guessed: 
      blanklist.append(i) 
     else: 
      blanklist.append("-") 
    blanklist_string = "".join(blanklist) 
    return blanklist_string 

def play_hangman(): 
    # Actually play the hangman game 
    global secret_word 
    global letters_guessed 
    global MAX_GUESSES 
    # Put the mistakes_made variable here, since you'll only use it in this function 
    mistakes_made = 0 
    guesses = 0 
    guesses_left = MAX_GUESSES - guesses 

    while word_guessed() is False: 
     print print_guessed() 
     print "%s guesses left!" % guesses_left 
     letter_choice = raw_input("Choose a letter:") 
     if letter_choice not in secret_word: 
      mistakes_made += 1 
      print "you have made %s mistakes" %mistakes_made 
      print "sorry, that is not in the word" 
     letters_guessed.append(letter_choice) 
     guesses +=1 
     print "you have made %s guesses" %guesses 
     word_guessed() 

    while word_guessed() is True: 
     print "Congratulations! You win :)" 
     break 

Answer 1

您不重新計算guesses_left。在每次迭代開始時，您必須做guesses_left = MAX_GUESSES - guesses

Answer 2

您需要將放入while word_guessed() is False:循環中。現在，您在設置guesses_left = MAX_GUESSES - guesses時guesses == 0，然後只在循環內更改guesses。這將使guesses_left不變。