如何编写程序以获取年龄作为输入？

Question

我想这样做，但我评论了 3 个问题：

age = input("How old are you ? ")
if type(age) != int: # this line does't work
    restart = input("invalid input. Do you want to restart ? [y/n]")
    if restart == "y" :
        #restart the program
    else :
        #exit the program

Answer 1

使用 try-except 块检查输入 (str) 到 int 的转换

age = input("How old are you ? ")
try:
    age = int(age)
except ValueError:
    restart = input("invalid input. Do you want to restart ? [y/n]")
    if restart == "y" :
        #restart the program
    else :
        #exit the program