Python While Loop困擾

Question

我是一名全新的程序員，我一直在努力學習Python（2.7）。我在網上發現了一些練習嘗試，其中一個涉及創建一個簡單的猜謎遊戲。

嘗試盡我所能，我無法弄清楚我的代碼有什麼問題。如果第一次正確猜測數字，則其中的while循環會正確執行。此外，如果第一次嘗試猜測較小的數字，則正確的代碼塊將執行 - 但隨後所有後續的「猜測」都會生成「較高」數字的代碼塊，而不管輸入如何。我已經在整個代碼中打印出變量來試着看看發生了什麼 - 但它沒有幫助。任何有識之士將不勝感激。謝謝！這裏是我的代碼：

from random import randint 

answer = randint(1, 100) 
print answer 
i = 1 


def logic(guess, answer, i): 
    guess = int(guess) 
    answer = int(answer) 
    while guess != answer: 
     print "Top of Loop" 
     print guess 
     print answer 
     i = i + 1 
     if guess < answer: 
      print "Too low. Try again:" 
      guess = raw_input() 
      print guess 
      print answer 
      print i 

     elif guess > answer: 
      print "Too high. Try again:" 
      guess = raw_input() 
      print guess 
      print answer 
      print i 

     else: 
      print "else statement" 

    print "Congratulations! You got it in %r guesses." % i 


print "Time to play a guessing game!" 
print "Enter a number between 1 and 100:" 
guess = raw_input() 
guess = int(guess) 

logic(guess, answer, i) 

我敢肯定，這是顯而易見的事情，我apoloogize提前如果我只是愚蠢。

Answer 1

你已經注意到，raw_input()返回一個字符串（如我在你的代碼的底部已經注意到）。但是你忘了把輸入改成while循環內的一個整數。

因爲它是一個字符串，它將總是大於一個數字（「hi」> n），因此這就是爲什麼"Too high. Try again:"總是被調用。

因此，只要改變guess = raw_input()到guess = int(raw_input())

Answer 2

試試這個：

guess = int(raw_input()) 

由於raw_input.__doc__介紹，返回類型爲string（和你想要一個int）。這意味着您將int與string進行比較，這會導致您獲得的看似錯誤的結果。有關更多信息，請參見this answer。

Answer 3

好吧，我發現你的問題。問題是在這個代碼：

if guess < answer: 
     print "Too low. Try again:" 
     guess = raw_input() 
     print guess 
     print answer 
     print i 

    elif guess > answer: 
     print "Too high. Try again:" 
     guess = raw_input() 
     print guess 
     print answer 
     print i 

在上面你得到你的輸入字符串作爲代碼，但你嘗試將它與整數進行比較。所有你需要做的是將輸入爲整數，如：

猜測的raw_input =（）
猜測= INT（猜測）

這應該解決您的問題:)

Answer 4

我更新該程序。你是從while循環中出來的，因爲在elif組裏面輸入猜測後，你忘記把它轉換成int，所以它返回錯誤。現在，糾正了，但你也可以優化它。

import sys 

from random import randint 

answer = randint(1, 100) 
'''randint(1, 100)''' 
print (answer) 
i = 1 


def logic(guess, answer, i): 
    guess = int(guess) 
    answer = int(answer) 
    while guess != answer: 
     print ("Top of Loop") 
     print (guess) 
     print (answer) 
     i = i + 1 

     if guess < answer: 
      print ("Too low. Try again:") 
      guess = int(input()) 
      print (guess) 
      print (answer) 
      print (i) 

     elif guess > answer: 
      print ("Too high. Try again:") 
      guess = int(input()) 
      print (guess) 
      print (answer) 
      print (i) 

     else: 
      print ("else statement") 

    print ("Congratulations! You got it in %r guesses." % i) 


print ("Time to play a guessing game!") 
print ("Enter a number between 1 and 100:") 
guess = input() 
guess = int(guess) 

logic(guess, answer, i)