如何创建单个aiohttp.ClientSession？

Question

aiohttp推荐一个app使用一个clientsession，但是clientsession无法在协程外声明，那我怎么在不同的协程使用同一个clientsession呢？

Answer 1

import aiohttp
import asyncio

class MySession:
    _session = None

    @classmethod
    def session(cls):
        if not cls._session:
            cls._session = aiohttp.ClientSession()
        return cls._session

    @classmethod
    def close(cls):
        return cls._session.close()


async def get_sth():
    resp = await MySession.session().get('http://httpbin.org/get')
    print(await resp.text())

async def close_session():
    await MySession.close()

# before start your app
loop = asyncio.get_event_loop()

loop.run_until_complete(get_sth())
# ...

# after stop your app
loop.run_until_complete(close_session())