利用python 写一些网络服务的时候，当网络状况不好，或者资源占用过多，任务拥塞的情况下，总会抛出一些异常，当前任务就被终止了，可以很好的利用@装饰器，写一个重试的装饰器，这样比较python！

执行结果：

复制代码 代码如下:

WARNING:root:timed out, Retrying in 3 seconds...

WARNING:root:timed out, Retrying in 6 seconds...

WARNING:root:timed out, Retrying in 12 seconds...

复制代码 代码如下:

#!/usr/bin/env python

# -*- coding: utf-8 -*-

# tanyewei@gmail.com

# 2014/01/27 10:36

import time

import logging

import socket

from functools import wraps

logging.basicConfig(level=logging.DEBUG)

def retry(MyException, tries=4, delay=3, backoff=2, logger=None):

def deco_retry(f):

@wraps(f)

def f_retry(*args, **kwargs):

mtries, mdelay = tries, delay

while mtries > 1:

try:

return f(*args, **kwargs)

except MyException as ex:

msg = "%s, Retrying in %d seconds..." % (str(ex), mdelay)

if logger:

logger.warning(msg)

else:

print msg

time.sleep(mdelay)

mtries -= 1

mdelay *= backoff

return str(ex)

return f_retry

return deco_retry

@retry(Exception, logger=logging)

def check():

sk = socket.socket()

sk.settimeout(5)

sk.connect(('6.6.6.6', 80))

if __name__ == "__main__":

check()