Python While 循环问题

Question

我是一个全新的程序员，我一直在努力学习 Python (2.7)。我在网上找了一些练习来尝试，其中一个涉及创建一个简单的猜谜游戏。

尽我所能，我无法弄清楚我的代码有什么问题。如果第一次猜对了数字，则其中的 while 循环将正确执行。此外，如果在第一次尝试时猜到了较低的数字，则执行正确的代码块 - 但随后所有“猜测”都会产生“较高”数字的代码块，而不管输入如何。我已经在整个代码中打印出变量来尝试看看发生了什么 - 但它没有帮助。任何见解将不胜感激。谢谢！这是我的代码：

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)

我确定这是显而易见的，如果我只是愚蠢，我提前道歉。

Answer 1

您已经注意到 raw_input() 返回一个字符串（正如我在您的代码底部注意到的那样）。但是您忘记在 while 循环内将输入更改为整数。

因为它是一个字符串，它总是大于一个数字（“hi” > n），这就是为什么总是调用"Too high. Try again:"。

所以，只需将 guess = raw_input() 更改为 guess = int(raw_input())

Answer 2

试试这个：

guess = int(raw_input())

正如raw_input.__doc__ 所描述的，返回类型是string（你想要一个int）。这意味着您将int 与string 进行比较，这会导致您获得看似错误的结果。请参阅this answer 了解更多信息。

Answer 3

好的，我发现了你的问题。问题出在这段代码中：

    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

在上面的代码中，您将输入作为字符串，但您尝试将其与整数进行比较。您需要做的就是将输入转换为整数，如下所示：

猜测 = raw_input()
猜测 = int（猜测）

这应该可以解决你的问题:)

Answer 4

我更新了程序。您退出了 while 循环，因为在 elif 组中将猜测作为输入后，您忘记将其转换为 int，因此它抛出了错误。现在，已更正，但您也可以对其进行优化。

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)