#coding=utf-8
import threading
from time import sleep,ctime

def sing():
    for i in range(3):
        print("正在唱歌...%d"%i)
        sleep(1)

def dance():
    for i in range(3):
        print("正在跳舞...%d"%i)
        sleep(1)

if __name__ == '__main__':
    print('---开始---:%s'%ctime())

    t1 = threading.Thread(target=sing)
    t2 = threading.Thread(target=dance)

    t1.start()
    t2.start()

    while True:
        length = len(threading.enumerate())
        print('当前运行的线程数为：%d'%length)
        if length<=1:
            break

        sleep(0.5)