python - 如何通过 Python 中的 input() 函数为无法转换为整数的字符串提供无效消息？

Question

我正在尝试编写一个程序，根据用户对“你的高度是多少？”这个问题的回答向用户发出响应。

我在第 4-7 行遇到问题，我试图要求用户输入有效提示(即防止接收无法转换为整数的字符串)。

我的代码在这里:

#ask for user's height, and convert reply into an integer
height = int(input("What is your height?"))

#check if user's input can be converted to an integer
if type(height) != int:
    print("Please enter a valid number")
    height = int(input("What is your height?")

#give user a response, based on user's height
if height > 180: 
    print("Your height, " + str(height) + ", is above average")
elif height > 155: 
    print("Your height, " + str(height) + ", is average")
else:
    print("Your height, " + str(height) + ", is below average")

非常感谢任何帮助/建议!

Answer 1

处理异常并重复直到你得到一个有效的数字:

while True:
    try:
        height = int(input("What is your height? "))
        break
    except ValueError:
        print("Please enter a valid number")

if height > 180: 
    print("Your height, " + str(height) + ", is above average")
elif height > 155: 
    print("Your height, " + str(height) + ", is average")
else:
    print("Your height, " + str(height) + ", is below average")

示例 session :

What is your height?: abc
Please enter a valid number
What is your height?: xyz
Please enter a valid number
What is your height?: 180
Your height, 180, is average