我的Pymyq脚本出现asyncio session is closed错误是什么原因？

• pymyq库近期的版本更新调整了会话复用逻辑：库内部会隐式缓存登录产生的API实例关联的aiohttp会话，不会随你代码中创建的ClientSession销毁而同步清除缓存。你代码中每个操作函数都用async with aiohttp.ClientSession()创建会话，操作结束后上下文管理器自动关闭该会话，但第二次执行时pymyq会优先调用已被关闭的缓存会话，直接抛出Session is closed错误。
• 你每次执行指令逻辑时都单独创建新的asyncio事件循环，旧循环关联的未完全销毁的异步资源会和新循环产生冲突，进一步放大了会话资源异常的问题。
• 重复登录逻辑也会加剧会话冲突：你每次执行开门、关门、查询操作都重新调用login()接口，没有复用已有有效会话，多余的登录请求也会触发服务端的会话管控逻辑，增加会话被提前关闭的概率，这也是脚本此前正常、近期突然报错的核心触发原因。

调整思路为统一管理会话和API实例，避免重复创建资源，核心修改后的代码参考如下：

import asyncio
import aiohttp
import pymyq
from pymyq.errors import MyQError

EMAIL = "替换为你的登录邮箱"
PASSWORD = "替换为你的登录密码"
DEVICE_ID = "替换为你的车库门设备ID"

# 全局缓存API实例和会话，避免重复创建
api = None
websession = None

async def init_device():
    global api, websession
    # 仅在会话关闭或未初始化时创建新会话
    if not websession or websession.closed:
        websession = aiohttp.ClientSession()
    # 仅在API未初始化时调用登录接口
    if not api:
        api = await pymyq.login(EMAIL, PASSWORD, websession)
    return api.devices[DEVICE_ID]

async def door_position():
    try:
        device = await init_device()
        return device.state
    except MyQError as err:
        return 'error'

async def door_open():
    try:
        device = await init_device()
        await device.open()
        return 'success'
    except MyQError as err:
        return 'error'

async def door_close():
    try:
        device = await init_device()
        await device.close()
        return 'success'
    except MyQError as err:
        return 'error'

# 复用同一个事件循环，不要重复新建
loop = asyncio.get_event_loop()

def handle_command(command):
    Input = command.lower()
    try:
        if 'garage door status' in Input:
            door_status = loop.run_until_complete(door_position())
            return f'The garage door is {door_status}'
        elif 'open the garage door' in Input:
            loop.run_until_complete(door_open())
            return 'The garage door is now opening'
        elif 'close the garage door' in Input:
            loop.run_until_complete(door_close())
            return 'The garage door is now closing'
        else:
            return 'command unknown.'
    except Exception as e:
        return f'*******ERROR*****{str(e)}'

内容的提问来源于stack exchange，提问作者Erik Caldwell