我如何再次运行此脚本并避免无限循环？ [重复]

Question

此问题已经在这里有了答案：

Asking the user for input until they give a valid response （20个答案）

已关闭1分钟前。

这里是python noob。

当用户触发elif子句时，出现无限循环。如何使程序再次询问原始问题？

print('How many cats do you have?')

numCats = input()


def cats():

    try:

        while True:
            if int(numCats) >= 4:
                print("That's a lot of cats!")
                break

            elif int(numCats) < 0:
                print("Please a number enter that is 0 or greater")


            else:
                print("That's not a lot of cats")
                break      

    except ValueError:
        print("You did not enter a number")

cats()

Answer 1

在numCats = input()之后的elif处输入print("Please a number enter that is 0 or greater")

Answer 2

尝试如下更改省略号：

elif int(numCats) < 0:
    numCats = input("Please a number enter that is 0 or greater")

Answer 3

您需要在elif语句后添加break。那将使您的代码停止运行。或者，您可以再次提出输入问题。像这样的东西：

def cats():
    try:
        while True:
            if int(numCats) >= 4:
                print("That's a lot of cats!")
                break

            elif int(numCats) < 0:
                print("Please a number enter that is 0 or greater")
                print('How many cats do you have?')
                numCats = input()
                cats()

            else:
                print("That's not a lot of cats")
                break      
    except ValueError:
        print("You did not enter a number")

Answer 4

像这样编辑elif：

elif int(numCats) < 0:
    print("Please a number enter that is 0 or greater")
    numCats = input('How many cats do you have?')