*禁白嫖*python---抛出异常处理

异常处理中抛出异常

class Test(object):

    def __init__(self,switch):

        self.switch=switch

    def calc(self,a,b):

        try:

            return a/b

        except ZeroDivisionError as result:

            if self.switch:

                print('the exception already open , catch the info is',result)

            else:

                raise

a=Test(True)

a.calc(11,0)

a.switch=False

a.calc(11,0)

抛出自定义的异常 raise语句来引发自定义的异常

定义输出的长度 属性中有长度和至少输出的长度

class ShortInputException(Exception):

    def __init__(self,length,least):

        # super__init__()

        # 建议填写super这一项调用父类的方法 之后再添加自己的功能

        self.length=length

        self.least=least

# 主函数中输入信息 并且进行判断之后进行抛异常

def main():

    try:

        s=input('please input the num or word ----->')

        if len(s)<3:

            raise ShortInputException(len(s),3)

    except ShortInputExceptionas result:

        print('ShortInputException : input the length is  %s, the lenth of atleast is %s' %  (result.length,result.atleast))

    else:

        print('no exception happending ! ! !')

main()

嵌套函数抛出异常

def test1():

    print('***** test1 *****')

    print(num)

    print('***** test2 *****')

def test2():

    print(' ***** test3 ***** ')

    open('a.txt')

    print(' ***** test4 ***** ')

def test3():

    try:

        print(' ***** test5 - 1 *****')

        test1()

        test2()

        print('  ***** test5 -2 *****')

    except Exception as result:

        print('catch the exception ! ! !',result)

test3()