本文实例讲述了python3实现并发检验代理池地址的方法。分享给大家供大家参考，具体如下：
#encoding=utf-8
#author: walker
#date: 2016-04-14
#summary: 用协程/线程池并发检验代理有效性
import os, sys, time
import requests
from concurrent import futures
cur_dir_fullpath = os.path.dirname(os.path.abspath(__file__))
headers = {
‘accept’: ‘*/*’,
‘user-agent’: ‘mozilla/4.0 (compatible; msie 8.0; windows nt 6.1; wow64; trident/4.0; slcc2; .net clr 2.0.50727; .net clr 3.5.30729; .net clr 3.0.30729; .net4.0c; .net4.0e)’,
}
#检验单个代理的有效性
#如果有效，返回该proxy；否则，返回空字符串
def check(desturl, proxy, feature):
proxies = {‘http’: ‘http://’ + proxy}
r = none #声明
exmsg = none
try:
r = requests.get(url=desturl, headers=headers, proxies=proxies, timeout=3)
except:
exmsg = ‘* ‘ + traceback.format_exc()
#print(exmsg)
finally:
if ‘r’ in locals() and r:
r.close()
if exmsg:
return ”
if r.status_code != 200:
return ”
if r.text.find(feature) < 0:
return ''
return proxy
#输入代理列表(set/list)，返回有效代理列表
def getvalidproxypool(rawproxypool, desturl, feature):
validproxylist = list() #有效代理列表
pool = futures.threadpoolexecutor(8)
futurelist = list()
for proxy in rawproxypool:
futurelist.append(pool.submit(check, desturl, proxy, feature))
print('\n submit done, waiting for responses\n')
for future in futures.as_completed(futurelist):
proxy = future.result()
print('proxy:' + proxy)
if proxy: #有效代理
validproxylist.append(proxy)
print('validproxylist size:' + str(len(validproxylist)))
return validproxylist
#获取原始代理池
def getrawproxypool():
rawproxypool = set()
#通过某种方式获取原始代理池......
return rawproxypool
if __name__ == "__main__":
rawproxypool = getrawproxypool()
desturl = 'http://...' #需要通过代理访问的目标地址
feature = 'xxx' #目标网页的特征码
validproxypool = getvalidproxypool(rawproxypool, desturl, feature)
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