1. def su_one():
    2.     flag = True
    3.     while flag:
    4.         a,b,c = input('输入你的数字并用空格隔开：').split())
    5.         if a.isdigit() and b.isdigit() and c.isdigit():
    6.             a = int(a)
    7.             b = int(b)
    8.             c = int(c)
    9.             print(sum((a,b,c)))
    10.             print(sum((a,b,c)) / 3)
    11.             break
    12.             flag = False
    13.         else:
    14.             print('您的输入有误请重新输入！')
    15. su_one()