初学者提问，如何用函数编写

def cube(a,b,c):
    s=2*(a*b+b*c+a*c)
    v=a*b*c
    return [s,v]
a=b=c=-1
while a<=0 or b<=0 or c<=0:
    a,b,c=map(float,input('请输入长方体的长，宽，高（逗号分隔）：').split(','))
s,v=cube(a,b,c)
print('边长为{},{},{}的长方体的表面积为：{}，体积为：{}.'.format(a,b,c,s,v))

 觉得有用的话采纳一下哈

def cube(a, b, c):
    return 2 * (a * b + a * c + b * c), a * b * c


while 1:

    x = input("长宽高:")
    if x.count(",") > 2:
        continue

    try:
        length, width, height = x.split(",")[0], x.split(",")[1], x.split(",")[2]
    except IndexError:
        continue
    try:
        if float(length) <= 0 or float(width) <= 0 or float(height) <= 0:
            continue
    except ValueError:
        continue

    print("边长:{0},{1},{2},表面积：{3},体积:{4}.".format(length, width, height,
                                                  cube(float(length), float(width), float(height))[0],
                                                  cube(float(length), float(width), float(height))[1]))
    break