exception1.py

#!/usr/bin/env python3
# -*- coding:utf-8 -*-
# github:https://github.com/tangthis
# 错误处理

try:
	print('try...')
	r = 10/0
	print('result:',r)
except ZeroDivisionError as e:
	print('exception:',e)
finally:
	print('finally')
print('END')


#如果没有错误发生，可以在except语句块后面加一个else，当没有错误发生时，会自动执行else语句
try:
    print('try...')
    r = 10 / int('2')
    print('result:', r)
except ValueError as e:
    print('ValueError:', e)
except ZeroDivisionError as e:
    print('ZeroDivisionError:', e)
else:
    print('no error!')
finally:
    print('finally...')
print('END')


#记录错误

import logging

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

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

def main():
    try:
        bar('0')
    except Exception as e:
        logging.exception(e)

main()
print('END')

#抛出错误
class FooError(ValueError):
    pass

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

foo('0')

#raise语句如果不带参数，就会把当前错误原样抛出。此外，在except中raise一个Error，还可以把一种类型的错误转化成另一种类型