python重试装饰器示例
2019/7/13 21:56:23
本文主要是介绍python重试装饰器示例,对大家解决编程问题具有一定的参考价值,需要的程序猿们随着小编来一起学习吧!
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...
#!/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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