While loop 如何防止布尔while循环中的无限循环？

我有这样的代码：

maybeYes = raw_input("Please enter Yes to continue.")
    if maybeYes != "Yes":
        print "Try again."
        # ask for input again
    else:
        pass

---

我应该在我想让它再次请求输入的地方填写什么？

您应该直接在循环中进行原始输入

while True:
    result = raw_input("...")
    if result != "Yes":
        print "Try again."
        continue
    else:
        break

---

在我看来，你想要一个无限循环

maybeYes = raw_input("Please enter Yes to continue.")
while maybeYes != "Yes":
    maybeYes = raw_input("Please try again.")

但是，您始终可以添加计数器/转义符

maybeYes = raw_input("Please enter Yes to continue.")
attempts = 0
while maybeYes != "Yes" and attempts < 10:
    maybeYes = raw_input("Please try again.")
    attempts += 1

这将循环打印错误，直到用户键入yes、yes、yes、yes或yes，因为在检查yes之前，输入将转换为全大写，然后您的代码可以继续

while raw_input("Please enter Yes to start: ").upper() != 'YES':
       print 'Wrong'

print 'Correct'

#Carry on here 

输出：

Please enter Yes to start: nowg
Wrong
Please enter Yes to start: wggwe
Wrong
Please enter Yes to start: Yes
Correct

---

不知道为什么这被否决了，它不仅是正确的，而且比目前的其他两个答案更干净、更有力？可能是因为人们开始喜欢否决我猜通过这句话-会给你声誉，你试图说…会增加你作为一个提问者的声誉，而不是分数