python重试装饰器示例

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：

warning:root:timed out, retrying in 3 seconds...
warning:root:timed out, retrying in 6 seconds...
warning:root:timed out, retrying in 12 seconds...

#!/usr/bin/env python
# -*- coding: utf-8 -*-
#  [e-mail]
#  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()