Python异常的使用

伪代码:

  try:

    出错部分的代码......

  except Exception as e:

    print '404网页'        #Exception是所有错误类型的父类,包括所有出错信息

  finally:

    操作(不管是否出错,finally都执行)

我的例子程序:

#import os
def func(a,b):
    return a/b

if __name__ == "__main__":
    try:
        func(3,0)
    except Exception as e:
        print('404ERROR,to the new index page.....')
    finally:
        print('Finally,no error!')
print('end')

 

 

def foo(s):
    return 10 / int(s)

def bar(s):
    return foo(s) * 2

def main():
    try:
        bar('0')
    except Exception as e:
        print('Error:', e)
    finally:
        print('finally...')

 

自定义抛出的异常:(较少使用)http://www.liaoxuefeng.com/wiki/0014316089557264a6b348958f449949df42a6d3a2e542c000/00143191375461417a222c54b7e4d65b258f491c093a515000

# err_raise.py
class FooError(ValueError):
    pass

def foo(s):
    n = int(s)
    if n==0:
        raise FooError('invalid value: %s' % s)
    return 10 / n

foo('0')

 

posted @ 2016-08-09 18:17  航飞冲天  阅读(148)  评论(0编辑  收藏  举报