初学者写python之被除数连续被除四次

class Div(Exception):
    def __init__(self, x, y):
        self.x = x
        self.y = y


count = 0
try:
    a = int(input('请输入被除数'))
    for i in range(1, 5):  # 循环四次
        b = int(input('请输入除数'))
        count += 1
        if b == 0:
            raise Div(a, b)
        else:
            c = a / b
            print('第%d次结果:%.2f除以%.2f等于%.2f' % (count, a, b, c))
            a = c
except Div as error:
    print('程序第%d次出现异常:除数%.2f不能为0' % (count, error.y))

运行结果：