python装饰器 python重试装饰器示例

时间:2021-03-19 人气:0

想了解python重试装饰器示例的相关内容吗，在本文为您仔细讲解python装饰器的相关知识和一些Code实例，欢迎阅读和指正，我们先划重点：装饰器，下面大家一起来学习吧。

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...

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()

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