Python自动重试HTTP连接装饰器

#-*- coding: utf-8 -*-  
#all decorators in this tool file 
#author: orangleliu 
 
############################################################ 
#http连接有问题时候，自动重连 
def conn_try_again(function): 
  RETRIES = 0 
  #重试的次数 
  count = {"num": RETRIES} 
  def wrapped(*args,**kwargs): 
    try: 
      return function(*args,**kwargs) 
    except Exception,err: 
      if count['num'] < 2: 
        count['num'] += 1 
        return wrapped(*args,**kwargs)          
      else: 
        raise Exception(err) 
  return wrapped 

@conn_try_again 
def post_query_bandwidth_for_bandwidth(self,contract_no,data_month,product_code): 
  #根据webluker接口情况获取计费数据   
  try: 
    post_data = {'contract':contract_no,'month': data_month,'code':product_code} 
    params = urllib.urlencode(post_data) 
    response = urllib2.urlopen(WEBLUKER_BANDWITH_API + "?" +params) 
    billdata = {} 
    billdata = response.read() 
    if not billdata: 
      billdata = {} 
    return billdata 
  except Exception,err: 
    err = u'与webluker接口间通信异常' 
    raise Exception(err)