python多线程完成多个任务

# 线程: 线程可以理解成执行代码的分支， 线程是执行对应的代码的， cpu调度线程去执行对应代码
import time
import threading


# 跳舞的任务
def dance():
    # 获取当前执行代码的线程
    current_thread = threading.current_thread()
    print("dance:", current_thread)
    for i in range(5):
        print("跳舞中....")
        time.sleep(0.2)


# 唱歌
def sing():
    # 获取当前执行代码的线程
    current_thread = threading.current_thread()
    print("sing:", current_thread)
    for i in range(5):
        print("唱歌中....")
        time.sleep(0.2)

if __name__ == '__main__':

    # 获取当前执行代码的线程
    current_thread = threading.current_thread()
    print("main:", current_thread)
    # 获取程序活动线程的列表
    thread_list = threading.enumerate()
    #print("111:", thread_list)
    # 创建跳舞的线程
    dance_thread = threading.Thread(target=dance)
    #print("dance_thread:", dance_thread)
    # 创建唱歌的线程
    sing_thread = threading.Thread(target=sing)
    #print("sing_thread:", sing_thread)
    thread_list = threading.enumerate()
    #print("222:", thread_list)
    # 启动线程执行对应的任务
    dance_thread.start()
    sing_thread.start()
    # 提示:线程执行完成任务以后该线程就会销毁
    thread_list = threading.enumerate()
    #print("333:", thread_list, len(thread_list))
    # 扩展-获取活动线程的个数
    active_count = threading.active_count()
   # print("333:", active_count)
    # # 主线程执行唱歌
    # sing()

    # 注意点： 线程之间执行是无序的，由cpu调度决定的