python 多线程

import threading
import time
def func(times,name):
    for i in range(times):
        print(name+'   run:  ' +str(i) +'\n')
        time.sleep(1)

if __name__=='__main__':
    thread_pool=[]

    ret={}
    th_1=threading.Thread(target=func,args=[5,'th_1'],name='th_1')
    th_2=threading.Thread(target=func,args=[5,'th_2'],name='th_2')

    thread_pool.append(th_1)
    thread_pool.append(th_2)

    print('主线程开始')
    for th in thread_pool:
        th.start()
    for th in thread_pool:
        th.join()
    print('主线程结束')

import threading

class ThreadChild(threading.Thread):
    def __init__(self,times,name):
        threading.Thread.__init__(self)
        self.times=times
        self.name=name
    def run(self):
        for i in range(self.times):
            print