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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：
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#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 responsesn')
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)
希望本文所述对大家Python程序设计有所帮助。