python基于queue和threading实现多线程下载实例
本文实例讲述了python基于queue和threading实现多线程下载的方法,分享给大家供大家参考。具体方法如下:
主代码如下:
#downloadworker queue_download=Queue.Queue(0) DOWNLOAD_WORKERS=20 foriinrange(DOWNLOAD_WORKERS): DownloadWorker(queue_download).start()#startadownloadworker formd5inMD5S: queue_download.put(md5) foriinrange(DOWNLOAD_WORKERS): queue_download.put(None)
其中downloadworkers.py
类继承threading.Thread,重载run方法..在__init__中调用threading.Thread.__init__(self),
在run方法中实现耗时的操作
importthreading importQueue importmd5query importDOM importos,sys classDownloadWorker(threading.Thread): """""" def__init__(self,queue): """Constructor""" self.__queue=queue threading.Thread.__init__(self) defrun(self): while1: md5=self.__queue.get() ifmd5isNone: break#reachedendofqueue #thisisatime-costproduce self._down(md5) print"task:",md5,"finished" def_down(self,md5): config={ 'input':sys.stdin, 'output':'./samples', 'location':'xxx', 'has-fn':False, 'options':{'connect.timeout':60,'timeout':3600}, 'log':file('logs.txt','w'), } print'download%s...'%(md5) try: data=downloadproc(config['location'],config['options'])#我的下载过程 ifdata: dom,fileData=md5query.splited(data) filename=md5 ifconfig['has-fn']: filename='%s_%s'%(md5,dom.nodeValue2('xxxxxxx','').encode('utf-8'))#这是我的下载的方法 f=file(os.path.join(config['output'],filename),'w') f.write(fileData) f.close() print'%s\tok'%(md5) else: print>>config['log'],'%s\t%s'%(md5,'failed') exceptException,e: print>>config['log'],'%s\t%s'%(md5,str(e))
希望本文所述对大家的Python程序设计有所帮助。