#coding=utf-8
import threading  
  
def thread_fun(num):  
    for n in range(0, int(num)):  
        print " I come from %s, num: %s" %( threading.currentThread().getName(), n)  
  
def main(thread_num):  
    thread_list = list();  
    # 先创建线程对象  
    for i in range(0, thread_num):  
        thread_name = "thread_%s" %i  
        thread_list.append(threading.Thread(target = thread_fun, name = thread_name, args = (20,)))  
      
    # 启动所有线程     
    for thread in thread_list:  
        thread.start()  
      
    # 主线程中等待所有子线程退出  
    for thread in thread_list:  
        thread.join()  
  
if __name__ == "__main__":  
    main(3)