Question

我是Python的新手，无法弄清楚为什么While循环在以下代码中保持运行？

prompt = "Please enter the customer's age: "
age = input(prompt)
while age != 'quit':
    age = int(age)
    if age <= 3:
        print("Welcome little buddy, no charges for you!")
    elif age > 3 and age < 12:
        print("The ticket price is $10")
    elif age >= 12:
        print("The ticket price is 15")
    elif age == 'quit':
        print("rerun the code")

Answer 1

我认为你期望从你的代码...我做了一些改变。你的while循环没有停止因为它没有理由停止。它正在反复测试相同的值

def agetest():
age = input("Please enter the customer's age: ")
age = int(age)
if 0<age <= 3:
    print("Welcome little buddy, no charges for you!")
    agetest()
elif age > 3 and age < 12:
    print("The ticket price is $10")
    agetest()
elif age >= 12:
    print("The ticket price is 15")
    agetest()
elif age == -1:
    print("thnks")

agetest（）

这是while循环的答案

age=0
while(age!= -1):

print("Please enter the customer's age: ")
age = int(input())
if 0<age <= 3:
    print("Welcome little buddy, no charges for you!")

elif age > 3 and age < 12:
    print("The ticket price is $10")

elif age >= 12:
    print("The ticket price is 15")

elif age == -1:
    print("thanks")

Answer 2

我已经接受了你的代码并进行了一些修改。问题是：

你得到了循环的输入，所以它不是交互式的。
没有声明修改年龄来打破循环。

如果您希望输入字符串，则无法将输入转换为整数。

 while True:
        prompt = "Please enter the customer's age: "
        age = input(prompt)
        if age == 'quit':
          print("rerun the code")
          break
        elif age <= 3:
            print("Welcome little buddy, no charges for you!")
        elif age > 3 and age < 12:
            print("The ticket price is $10")
        elif age >= 12:
            print("The ticket price is 15")

为什么While循环继续在以下Python代码中运行？

2 个答案: