python 用Threading建立多線程

#-*-coding:utf-8-*-
'''python標準庫提供了兩個多線程模塊，分別爲thread和threading，
其中thread模塊是低級模塊，threading是高級模塊，對thread進行了封裝，
絕大多數狀況下，只須要使用threading這個高級模塊'''
#使用threading模塊建立多線程
#方式一：把一個函數傳入並穿件Thread實例，而後調用start方法開始執行
import random
import time,threading

#新線程執行的代碼
# 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：直接從threading.Thread集成並穿件線程類，而後從新__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爬蟲開發與項目實戰》