线程的join方法

code

from threading import Thread
import time
 
def sayhi(name):
    time.sleep(2)
    print('%s say hello' % name)
 
if __name__ == '__main__':
    t = Thread(target=sayhi, args=('nick',))
    t.start()
    t.join() #主线程等待子线程结束
    print('主线程')
    print(t.is_alive())
 
 

outputs

macname@MacdeMacBook-Pro py % python3 cccccc.py
nick say hello
主线程
False
macname@MacdeMacBook-Pro py %