Question

我的代码如下：

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

我想填写哪些内容再次要求输入？

Answer 1

你应该直接在循环中执行raw_input。

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

Answer 2

这将循环打印wrong，直到用户输入yes，Yes，YEs，YES，yEs或{{1}在检查yeS之前输入被转换为全部大写，那么你的代码可以继续......

YES

输出：

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

print 'Correct'

#Carry on here

Answer 3

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

如何防止布尔while循环中的无限循环？

3 个答案: