Python使用signal定时竣事AsyncIOScheduler任务的题目

<ol>
    <li>在调度器scheduler.start()后，程序直接退出（在Jupiter中任务可以正常启动）</li>
    <li>如何在指定时间调用scheduler.shutdown()? (因为程序直接退出了）
    </li>
</ol>
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from datetime import datetime, timedelta

import aiohttp
from apscheduler.schedulers.asyncio import AsyncIOScheduler
from apscheduler.jobstores.sqlalchemy import SQLAlchemyJobStore
async def get(session):
    url = 'https://httpbin.org/get?a=1'
    async with session.get(url) as res:
        print('get', res.status)
        return await res.text()

async def post(session):
    url = 'https://httpbin.org/post?b=2'
    async with session.post(url) as res:
        print('post', res.status)
        return await res.text()
async def main():
    async with aiohttp.ClientSession() as session:
        await get(session)
        await post(session)

if __name__ == '__main__':
    jobstores = {'default': SQLAlchemyJobStore(url='sqlite:///jobs.sqlite')}
    scheduler = AsyncIOScheduler(jobstores=jobstores)
    for i in range(10):  # 添加10个任务
        job = scheduler.add_job(main, 'date', run_date=datetime.now() + timedelta(seconds=10))
    scheduler.start()
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asyncio.get_event_loop().run_forever()
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# -*- coding: utf-8 -*-
"""
@Time ： 2021/7/23
@Auth ： hanzhichao
@Desc：
"""
from datetime import datetime, timedelta
import signal
import asyncio

import aiohttp
from apscheduler.schedulers.asyncio import AsyncIOScheduler
from apscheduler.jobstores.sqlalchemy import SQLAlchemyJobStore

async def get(session):
    url = 'https://httpbin.org/get?a=1'
    async with session.get(url) as res:
        print('get', res.status)
        return await res.text()

async def post(session):
    url = 'https://httpbin.org/post?b=2'
    async with session.post(url) as res:
        print('post', res.status)
        return await res.text()

async def main():
    async with aiohttp.ClientSession() as session:
        await get(session)
        await post(session)

if __name__ == '__main__':
    jobstores = {'default': SQLAlchemyJobStore(url='sqlite:///jobs.sqlite')}
    scheduler = AsyncIOScheduler(jobstores=jobstores)
    for i in range(10):  # 添加10个任务
        job = scheduler.add_job(main, 'date', run_date=datetime.now() + timedelta(seconds=10))
    scheduler.start()
    signal.alarm(20)  # 20秒后终止程序
    asyncio.get_event_loop().run_forever()  # 永远运行
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