如何使用Python中的遞歸計數器？

我想在Python中編寫一個簡單的「密碼」程序，允許3次嘗試在遞歸函數中「登錄」。我不明白爲什麼它不工作，但...（是的，侏羅紀公園的啓發）如何使用Python中的遞歸計數器？

def magicWord(count): 
    int(count) 
    answer = raw_input("What is the password? ") 
    if answer == 'lucas': 
     print 'ACESS GRANTED' 
    else: 
     count =+ 1 
     if count > 2: 
      while count > 2: 
       count+=1 
       print "na na na you didn\'t say the magic word. " 
     else: 
      magicWord(count) 

magicWord(0)

來源

2012-04-21 amorimluc

你的意思是'數+ = 1'後別的'：'？ – 2012-04-21 06:04:31

帶有int（count）的行不做任何事情：'int（..）'返回它的參數轉換爲一個整數，它不影響它的參數。 – huon 2012-04-21 06:15:14

你爲什麼要使用遞歸？在這裏似乎並不需要。這是作業嗎？ – Shep 2012-04-21 06:27:51

你非常接近。有隻是一對夫婦輕微修正起坐：

def magicWord(count): 
    answer = raw_input("What is the password? ") 
    if answer == 'lucas': 
     print 'ACESS GRANTED' 
    else: 
     count += 1 
     if count > 2: 
      print "na na na you didn\'t say the magic word. " 
      return 
     else: 
      magicWord(count)

這裏有一個樣本會話：

>>> magicWord(0) 
What is the password? alan 
What is the password? ellie 
What is the password? ian 
na na na you didn't say the magic word.

來源

2012-04-21 06:09:14

噢，你刪除了與侏羅紀公園登錄失敗有關的原始無限循環！ – Darthfett 2012-04-21 06:12:11

哦，語法錯誤+ =。謝謝！ – amorimluc 2012-04-21 16:32:14

你真的需要一個遞歸嗎？我的變種不使用它，它似乎更容易

def magic_word(attempts): 
    for attempt in range(attempts): 
     answer = raw_input("What is the password? ") 
     if answer == 'lucas': 
      return True 
    return False 

if magic_word(3): 
    print 'ACESS GRANTED' 
else: 
    print "na na na you didn\'t say the magic word. "

來源

2012-04-21 06:07:24 San4ez

是的問題確實說使用遞歸。 – jamylak 2012-04-21 06:08:26

在這裏你去！遞歸沒有硬編碼函數內的嘗試次數：

def magicword(attempts): 
    valid_pw = ['lucas'] 
    if attempts: 
     answer = raw_input('What is the password?') 
     if answer in valid_pw: 
      return True 
     else: 
      return magicword(attempts -1) 

if magicword(3): 
    print 'you got it right' 
else: 
    print "na na na you didn't say the magic word"

回報：

What is the password?ian 
What is the password?elli 
What is the password?bob 
na na na you didn't say the magic word 
>>> ================================ RESTART ================================ 
>>> 
What is the password?ian 
What is the password?lucas 
you got it right

來源

2012-04-21 06:39:39 hexparrot

+1優雅和封裝。 – gauden 2012-04-21 07:48:47

如何使用Python中的遞歸計數器？

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