Python 3.x 如何使用aiohttp管理会话？

我正在使用aiohttp和asyncio来生成一批请求。我的第一种方法是在fetch（）函数（启动asyncio.gather作业）内创建一个会话，然后将会话对象传递给执行post请求的函数（get_info）

def批处理启动器（项目列表）
返回\值=循环。运行\直到\完成（获取（项目\列表））
返回值
异步def提取（项目列表）：
与aiohttp.ClientSession（）作为会话异步：#
def batch_starter(item_list)
    return_value = loop.run_until_complete(fetch(item_list))
    return return_value

async def fetch(item_list):
    async with aiohttp.ClientSession() as session:  # <- session started here
        results = await asyncio.gather(*[asyncio.ensure_future(get_info(session, item)) for item in item_list])

async def get_info(session, item):  # <- session passed to the function
    async with session.post("some_url", data={"id": item}) as resp:
        html = await resp.json()
        some_info = html.get('info')
        return some_info

import asyncio
import aiohttp
import json

loop = asyncio.new_event_loop()
asyncio.set_event_loop(loop)
session = aiohttp.ClientSession()  # <- session started at top of file

def batch_starter(item_list)
    return_value = loop.run_until_complete(fetch(item_list))
    return return_value

async def fetch(item_list):
    results = await asyncio.gather(*[asyncio.ensure_future(get_info(item)) for item in item_list])

async def get_info(item):
    async with session.post("some_url", data={"id": item}) as resp:  # <- session from outer scope is used
        html = await resp.json()
        some_info = html.get('info')
        return some_info