复制代码不能运行相同（hangman）

Question

我正在为一个学校项目的hang子手脚本工作。我卡住了，因为一行不能正常工作，即使一个副本在不同的脚本中工作（也包括在下面）。这里的主要代码：

def random_word(word_list): 
    global the_word 
    the_word = random.choice(word_list) 
    print (the_word) 
    print (".") 

def setup(): 
    global output_word 
    size = 0 
    for c in the_word: 
     size = size+1 
    output_word = size*"_ " 
    print (output_word, "("+str(size)+")") 

def alter(output_word, guessed_letter, the_word): 
    checkword = the_word 
    print ("outputword:",output_word) 
    previous = 0 
    fully_checked = False 
    while fully_checked == False: 
     checkword = checkword[previous:] 
     print ("..",checkword) 
     if guessed_letter in checkword: 
      the_index = (checkword.index(guessed_letter)) 
      print (output_word) 
      print (the_index) 
      print (guessed_letter) 
    # Line below just won't work 
      output_word= output_word.replace(output_word[the_index], guessed_letter) 
      print (output_word) 
      previous = the_index 
      fully_checked = True 

def guessing(): 
    global guessed_letter 
    guessed_letter = input("Enter a letter > ")  
    if guessed_letter in the_word: 
     alter(output_word, guessed_letter, the_word) 

所以行

output_word= output_word.replace(output_word[the_index], guessed_letter) 

应该打印出类似这样_ _ _ _ g^_ _ _（这个词摆动） 但它打印

_g_g_g_g_g_g_g

这是一个完整的输出：

costumed    #the_word 
. 
_ _ _ _ _ _ _ _ (8) #output_word + size 
Enter a letter > t 
outputword: _ _ _ _ _ _ _ _ 
.. costumed # 
_ _ _ _ _ _ _ _ 
3      # the_index 
t      #guessed_letter 
_t_t_t_t_t_t_t_t  #the new output_word 

然而，在这不同的测试代码，一切正常：

output_word = "thisworkstoo" 
the_index = output_word.find("w") 
guessed_letter = "X" 
output_word= output_word.replace(output_word[the_index], guessed_letter) 
print (output_word) 

输出： thisXorkstoo

Answer 1

替换替换所有它与第二个参数第一个参数。所以说

output_word= output_word.replace(output_word[the_index], guessed_letter) 

当output_word = _ _ _ _ _ _ _ _将guessed_letter取代每一个下划线。

所以我会以这样的事：

output_word = list(output_word) 
output_word[the_index] = guessed_letter 
output_word = ''.join(i for i in output_word) 

Shell实例：

>>> output_word = '_ _ _ _ _ _ _ _' 
>>> the_index = 3 
>>> guessed_letter = "t" 
>>> output_word = list(output_word) 
>>> output_word[the_index] = guessed_letter 
>>> output_word = ''.join(i for i in output_word) 
>>> output_word 
'_ _t_ _ _ _ _ _' 

一个更好的方法来做到这一点是：

output_word = output_word[:the_index] + guessed_letter + output_word[the_index+1]