Hangman蟒蛇遊戲索引錯誤在For循環與列表

Question

好吧，我正在做一個家庭作業，以在python中建立一個hang子手遊戲。到目前爲止，這是很順利，直到我得到這個惱人的錯誤：

Traceback (most recent call last): 
    File "/Users/Toly/Downloads/ps2 6/ps2_hangman.py", line 82, in <module> 
    if (remLetters[i] == userGuess): 
IndexError: string index out of range 

這裏是我的代碼：

# 6.00 Problem Set 3 
    # 
    # Hangman 
    # 


    # ----------------------------------- 
    # Helper code 
    # (you don't need to understand this helper code) 
    import random 
    import string 
    import time 

    WORDLIST_FILENAME = "words.txt" 

    def load_words(): 
     print "Loading word list from file..." 
     # inFile: file 
     inFile = open(WORDLIST_FILENAME, 'r', 0) 
     # line: string 
     line = inFile.readline() 
     # wordlist: list of strings 
     wordlist = string.split(line) 
     print " ", len(wordlist), "words loaded." 
     return wordlist 

    def choose_word(wordlist): 
     """ 
     wordlist (list): list of words (strings) 

     Returns a word from wordlist at random 
     """ 
     return random.choice(wordlist) 

    wordlist = load_words() 

    blankword="_ " 
    word=random.choice (wordlist)  
    remLetters = string.lowercase 
    remGuesses = 8 #starting number of guesses 
    remWord=len(word) 

    #makes a blank with the length of the word 
    print "Welcome to Hangman" 
    time.sleep(1) 
    print 
    print "Your word is", remWord,"letters long." 
    print 
    time.sleep (1) 

    while (remGuesses != 0 or blankword != word): 
     remBlankword=len(blankword) 


remWordDoubled=remWord*2 
    while (remWordDoubled!=len(blankword)): 
     blankword=blankword + "_ " 
    print blankword 
    print 
    print "You have",remGuesses," guesses left." 
    print 
    time.sleep(1) 
    userGuess= str(raw_input ("Guess a letter:")) 
    print 
    if (userGuess in word): 
     print "Excellent guess!" 

    else: 
     print "Bad Guess" 
     remGuesses=remGuesses-1 
    for i in range (1, len(remLetters)): 
     if (remLetters[i] == userGuess): 
      remLetters = remLetters[0:i] + remLetters[i+1:len(remLetters)] 

    print remLetters 


if (remGuesses == 0): 
    print 
    print "Sorry, you died! Ha, sucks!" 
    print 
    print 
    time.sleep (1) 
    print "End of Game" 


if (blankword == word): 
    print 
    print "Congradulations! You won!" 
    print 
    time.sleep(1) 
    print 
    print 
    print 
    print "End of Game" 

Answer 1

首先獲得指數的範圍remLetters，但是如果信== userGuess ，那麼你可以從remLetters中刪除一個字母。這意味着現在remLetters中最大的指數比以前減少了1個。當您嘗試索引範圍內返回的最高號碼時，您現在超出範圍，因此您可以獲得IndexError。

像這樣的東西可能是你在找什麼：

remLetters = ''.join(x for x in remLetters if x != userGuess) 

或者：

try: 
    idx = remLetters.index(userGuess) 
    remLetters = remLetters[:idx] + remLetters[idx+1:] 
except ValueError: 
    pass 

Answer 2

您正在改變串remLetters的循環，使它更短。所以，你最終與位於超出remLetters長度的指數：

for i in range (1, len(remLetters)): 
    if (remLetters[i] == userGuess): 
     remLetters = remLetters[0:i] + remLetters[i+1:len(remLetters)] 

使用.index()而不是找到匹配：

while userGuess in remLetters: 
    i = remLetters.index(userGuess) 
    remLetters = remLeters[:i] + remLetters[i+1:]