python多线程编程怎么退出

import threading,time,random

class Sea:

    def __init__(self):

        self.__sea = 0

    def m(self,i):

# 随机时间进行打印

        time.sleep(random.random()*2)

        print(i)

        if i == 1:

            self.__sea = 1

    def main(self):

        Threads = []

        # 将会启动10个线程,线程id为 1 时全部线程终止！

        for i in range(10):

            t = threading.Thread(target=self.m,args=(i,))

            t.daemon = 1

            Threads.append(t)

        # 启动所有线程

        for i in Threads:

            i.start()

        # 当标志位【 sea 】时所有多线程结束

        while 1:

            if self.__sea:

                break

        print('线程已退出!')

Sea().main()

# 继续执行后续程序

for i in range(5):

    print('yeah!')