Python 刚学, 纠结于多线程 concurrent.futures 的错乱的问题,请教下各位?

按照手册实例结合自己想写的一个多访问的脚本,有了以下的代码.有 2 种写法的: 第 1 种速度快很多,但是出现多个 print 输出,实在想不出怎么冒出来的.是线程出错还是线程多余的.我开的 5 个线程,print(future_to_url) 对象也是 5 个.但是跑起来就多了出 3 个,而且文字还错乱了.

第 2 种暂时没有发现问题,求指教第一种为何会出现这种问题?

URLS = {'baidu':'http://www.baidu.com', 'sogou':'http://www.sogou.com', 'so':'http://www.so.com', 'youku':'http://www.youku.com', 'qq':'http://www.qq.com' } def load_url(s,args): weburl = args['url'] if args['mark'] == 'baidu': print(s + "百度访问:" + weburl) rs = requests.get(weburl) if args['mark'] == 'so': print(s + "so:" + weburl) rs = requests.get(weburl) if args['mark'] == 'sogou': print(s + "搜狗访问:" + weburl) rs = requests.get(weburl) if args['mark'] == 'qq': print(s + "腾讯访问:" + weburl) rs = requests.get(weburl) if args['mark'] == 'youku': print(s + "优酷访问:" + weburl) rs = requests.get(weburl) return str(rs.status_code) title = '速度与激情' cOnData={'year':'2015','actor':'范迪塞尔,保罗沃克,杰森斯坦森,米歇尔罗德里格兹','subname':'狂野时速 7'} aa = [] start = datetime.datetime.now() with concurrent.futures.ThreadPoolExecutor(max_workers=5) as executor: # --------------------------------第 1 种.写法----------------------------------------------# future_to_url = {executor.submit(load_url,title,conData): (conData['mark'] ,conData['url']) for conData['mark'],conData['url'] in URLS.items()} print(future_to_url) for future in concurrent.futures.as_completed(future_to_url): url = future_to_url[future] #调用对应的 URL try: data = future.result() #获得函数返回的值 except Exception as exc: print('%r generated an exception: %s' % (conData['url'], exc))#调试异常错误 else: aa.append(data) #--------------------------------第 2 种.写法----------------------------------------------# # for conData['mark'],conData['url'] in URLS.items(): # future = executor.submit(load_url, title, conData) # print(future) # try: # data = future.result() #获得函数返回的值 # except Exception as exc: # print('%r generated an exception: %s' % (conData['url'], exc))#调试异常错误 # else: # aa.append(data) executor.shutdown(wait=True) end = datetime.datetime.now() print (end-start)