#-*-coding:utf-8-*-'''python标准库提供了两个多线程模块，分别为thread和threading，其中thread模块是低级模块，threading是高级模块，对thread进行了封装，绝大多数情况下，只需要使用threading这个高级模块'''#使用threading模块创建多线程#方式一：把一个函数传入并穿件Thread实例，然后调用start方法开始执行import randomimport time,threading#新线程执行的代码# def thread_run(urls):#     print("Current %s is running...."% threading.current_thread().name)#     for url in urls:#         print('%s--->>>%s'%(threading.current_thread().name,url))#         time.sleep(random.random())#     print("%s ended." % threading.current_thread().name)# print("%s is runing..."%threading.current_thread().name)# t1=threading.Thread(target=thread_run,name='Thread_1',args=(['url_1','url_2','url_3']))# t2=threading.Thread(target=thread_run,name='Thread_1',args=(['url_4','url_5','url_6']))# t1.start()# t2.start()# t1.join()# t2.join()# print("%s ended."% threading.current_thread().name)#方式二：直接从threading.Thread集成并穿件线程类，然后重新__init__方法和run方法class myThread(threading.Thread):    def __init__(self,name,urls):        threading.Thread.__init__(self,name=name)        self.urls=urls    def run(self):        print("Current %s is running..."%threading.current_thread().name)        for url in self.urls:            print("%s--->>>%s"%(threading.current_thread().name,url))            time.sleep(random.random())print("%s is running..."%threading.current_thread().name)t1=myThread(name='Thread 1',urls=['url_1','url_2','url_3'])t2=myThread(name='Thread 2',urls=['url_4','url_5','url_6'])t1.start()t2.start()t1.join()t2.join()print("%s ended "% threading.current_thread().name)

 摘自《Python爬虫开发与项目实战》