from multiprocessing import Process
from time import sleep


class MyProcess(Process):
    def run(self):
        sleep(3)


def main():
    processes = []
    for _ in range(5):
        new_proc = MyProcess()
        new_proc.start()
        processes.append(new_proc)
    print('started')
    while any(map(MyProcess.is_alive, processes)):
        sleep(0.01)
    print('stopped')


if __name__ == '__main__':
    main()