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  • Python__异常处理

    # aaaaaaaaa
    # print('===>')

    #语法错误
    # if :pass
    # def func:pass


    #逻辑错误
    # TypeError
    # for i in 3:
    # pass

    # NameError
    # aaaaa

    # ValueError
    # int('asdfsadf')

    #IndexError
    # l=[1,2]
    # l[1000]

    #KeyError
    # d={'a':1}
    # d['b']

    # AttributeError
    # class Foo:pass
    #
    # Foo.x

    # try:
    # f=open('a.txt')
    # next(f)
    # next(f)
    # next(f)
    # next(f)
    # next(f)
    # next(f)
    # next(f)
    # except StopIteration as e:
    # pass
    #
    #
    # print('====>')

    # try:
    # # aaaa
    # print('==-==>1')
    # l=[]
    # l[3]
    # print('==-==>2')
    # d={}
    # d['x']
    # print('==-==>3')
    # except NameError as e:
    # print(e)
    # except IndexError as e:
    # print(e)
    # except KeyError as e:
    # print(e)

    #
    # try:
    # # aaaa
    # print('==-==>1')
    # l=[]
    # l[3]
    # print('==-==>2')
    # d={}
    # d['x']
    # print('==-==>3')
    # except Exception as e:
    # print(e)

    # try:
    # aaaa
    # print('==-==>1')
    # # l=[]
    # # l[3]
    # # print('==-==>2')
    # # d={}
    # # d['x']
    # # print('==-==>3')
    # except NameError as e:
    # print(e)
    # except IndexError as e:
    # print(e)
    # except KeyError as e:
    # print(e)
    # except Exception as e:
    # print(e)
    # else:
    # print('在没有错误的时候执行')
    # finally:
    # print('无论有无错误,都会执行')

    # raise TypeError('----')


    # class EgonException(BaseException):
    # def __init__(self,msg):
    # self.msg=msg
    # def __str__(self):
    # return '<%s>' %self.msg
    #
    # raise EgonException('egon 的异常')

    # l=[1,2,3]
    # assert len(l) > 3


    #什么时候用try ...except
    #错误一定会发生,但是无法预知错误发生条件

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  • 原文地址:https://www.cnblogs.com/wangmengzhu/p/7404350.html
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