实现指定时间段运行程序及关闭程序

场景：程序需要在每天某一时间段内运行，然后在某一时间段内停止该程序。

from datetime import datetime, time
import multiprocessing
from time import sleep

# 程序运行时间在白天8:30 到 15:30  晚上20:30 到 凌晨 2:30
DAY_START = time(8, 30)
DAY_END = time(15, 30)

NIGHT_START = time(20, 30)
NIGHT_END = time(2, 30)


def run_child():
    while 1:
        print("正在运行子进程")


def run_parent():
    print("启动父进程")

    child_process = None  # 是否存在子进程

    while True:
        current_time = datetime.now().time()
        running = False  # 子进程是否可运行

        if DAY_START <= current_time <= DAY_END or (current_time >= NIGHT_START) or (current_time <= NIGHT_END):
            # 判断时候在可运行时间内
            running = True

        # 在时间段内则开启子进程
        if running and child_process is None:
            print("启动子进程")
            child_process = multiprocessing.Process(target=run_child)
            child_process.start()
            print("子进程启动成功")

        # 非记录时间则退出子进程
        if not running and child_process is not None:
            print("关闭子进程")
            child_process.terminate()
            child_process.join()
            child_process = None
            print("子进程关闭成功")

        sleep(5)


if __name__ == '__main__':
    run_parent()