在使用aiohttp结合apscheduler的AsyncIOScheduler模拟定点并发的时候遇到两个问题

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

原调试代码如下：

from datetime import datetime, timedeltaimport aiohttpfrom apscheduler.schedulers.asyncio import AsyncIOSchedulerfrom apscheduler.jobstores.sqlalchemy import SQLAlchemyJobStoreasync 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()

Google后发现AsyncIOScheduler的使用需要在scheduler启动后，需要自己调用asyncio.get_event_loop().run_forever()来启动协程任务。
但是一旦run_forever()则就会阻塞至死。除非有KeyboardInterrupt, SystemExit等异常或者强杀来停止其运行。
此时想到使用Python的signal来定时发送信号，修改后程序如下，可以正常延迟停止（感觉有点像模拟Go的defer)。

# -*- coding: utf-8 -*-"""@Time ： 2021/7/23@Auth ： hanzhichao@Desc："""from datetime import datetime, timedeltaimport signalimport asyncioimport aiohttpfrom apscheduler.schedulers.asyncio import AsyncIOSchedulerfrom apscheduler.jobstores.sqlalchemy import SQLAlchemyJobStoreasync 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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