Python中while循环问题的实现

Question

我希望用户键入“right”或“left”，根据输入，一些操作将发生。你知道吗

如果用户在前两次输入“right”，笑脸就会变得悲伤，无法走出森林。如果用户再多次输入“right”，笑脸总是会变得沮丧，砍掉一些树，做一张桌子，然后翻转出来，因为它无法走出森林。你知道吗

一旦用户键入“left”，笑脸就会从林中消失。你知道吗

下面是我的Python代码：

n = input("You are in the Lost Forest\n****************\n****************\n :)\n****************\n****************\nGo left or right? ")
i = 1
while n == "right" or n == "Right" and i < 3:
    n = input("You are in the Lost Forest\n****************\n****************\n :(\n****************\n****************\nGo left or right? ")
    i = i + 1
while n == "right" or n == "Right" and i >= 3:
    n = input("You are in the Lost Forest\n****************\n******       ***\n  (╯°□°）╯︵ ┻━┻\n****************\n****************\nGo left or right? ")
print("\nYou got out of the Lost Forest!\n\o/")

问题是，即使用户第三次、第四次或第五次键入“right”等等，也不会发生“翻页”操作。笑脸只会变得悲伤，它不会从第一圈出来。你知道吗

我做错什么了？你知道吗

Answer 1

您的if条件没有按预期工作，因为条件是按顺序计算的。因此，如果n=="right"为真，i的值无关紧要。相反，您应该将其更改为：

n = input("You are in the Lost Forest\n****************\n****************\n :)\n****************\n****************\nGo left or right? ")
i = 1
while (n == "right" or n == "Right") and i < 3:
    n = input("You are in the Lost Forest\n****************\n****************\n :(\n****************\n****************\nGo left or right? ")
    i = i + 1
while (n == "right" or n == "Right") and i >= 3:
    n = input("You are in the Lost Forest\n****************\n******       ***\n  (╯°□°）╯︵ ┻━┻\n****************\n****************\nGo left or right? ")
print("\nYou got out of the Lost Forest!\n\o/")

Answer 2

while语句中缺少括号。以下内容将满足您的需求：

n = input("You are in the Lost Forest\n****************\n****************\n :)\n****************\n****************\nGo left or right? ")
i = 1
while (n == "right" or n == "Right") and i < 3:
    n = input("You are in the Lost Forest\n****************\n****************\n :(\n****************\n****************\nGo left or right? ")
    i = i + 1
while (n == "right" or n == "Right") and i >= 3:
    n = input("You are in the Lost Forest\n****************\n******       ***\n  (╯°□°）╯︵ ┻━┻\n****************\n****************\nGo left or right? ")
print("\nYou got out of the Lost Forest!\n\o/")

Answer 3

我建议你用(n.lower() == "right")代替n == "right" or n == "Right"

这样，用户也可以输入正确的，它不会影响您的程序。你知道吗

另外，代码不起作用的原因是缺少括号，您可能可以从其他答案中看到。你知道吗