利用python 寫一些網絡服務的時候，當網絡狀況不好，或者資源占用過多，任務擁塞的情況下，總會拋出一些異常，當前任務就被終止了，可以很好的利用@裝飾器，寫一個重試的裝飾器，這樣比較python！
執行結果：
代碼如下:
WARNING:root:timed out, Retrying in 3 seconds...
WARNING:root:timed out, Retrying in 6 seconds...
WARNING:root:timed out, Retrying in 12 seconds...

代碼如下:
#!/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__":