线程创建 线程数

# *_*coding:utf-8 *_* 
import time
import threading
def sing():
    for i in range(5):

        print("唱山歌咯"+ str(i));
        time.sleep(1)

def dance():
    for i in range(5):
        print(‘跳舞‘+str(i))
        time.sleep(1)


def main():
    t1 = threading.Thread(target=sing)
    t2 = threading.Thread(target=dance)

    t1.start() // 这个时候线程才创建
    t2.start()

    while True:
        time.sleep(1)
        length = len(threading.enumerate())
        print("当前线程数"+str(length))



if __name__ == "__main__":
    main()
    print("结束")