我需要输入是一个数字。如果不是，则显示 "please enter number" 并再次要求输入

Question

这就是我想要的，但对于一个整数。我不允许使用 break 或 continue 退出循环。

# basically I need this, but with an int(input('please enter a number'))

ask = input('Would you like to play Steal or Deal [y|n]? ')


while ask not in ('y', 'n'):

    print ("Please enter either 'y' or 'n'")
    print('')
    ask = input('Would you like to play Steal or Deal [y|n]? ')

Answer 1

您可以尝试将字符串转换为 int 并捕获异常：

def is_number(s):
    try:
        int(s)
        return True
    except ValueError:
        return False

ask = input('please enter a number: ')

while not is_number(ask):

    print ("no, a number!")
    print('')
    ask = input('please enter a number: ')