nest_asyncio出现错误

Sanic项目做测试，运行 `pytest` 时报了这个错：`RuntimeError: Cannot run the event loop while another loop is running`

代码如下：

import pytest
from models.nezha import get_room_name


@pytest.mark.asyncio
async def test_get_room_name():
name = await get_room_name('a', 'b')
assert name == 'b'
# models/nezha.py


async def data_from_cache_or_http(
data_key: str, etag_key: str, url: str, renew: bool
) -> dict:
...

async def rooms_from_cache_or_http(
community: str, renew: bool = False
) -> dict:
data_key, etag_key = ROOMS_CACHED_KEY, ROOMS_ETAG_CACHED_KEY
url = HOST + f'/room-names/?community={community}'
return await data_from_cache_or_http(data_key, etag_key, url, renew)


async def get_room_name(community: str, slug: str) -> str:
"""获取小区slug和房间slug对应的房号"""
if community and slug:
rooms = await rooms_from_cache_or_http(community)
return rooms.get(slug, {}).get('name')
return ''

　　

 

原因：。。。google一搜就知道了，或者看这个：https://github.com/erdewit/nest_asyncio

解决：`pip install nest_asyncio`, 然后添加`import nest_asyncio; nest_asyncio.apply()`

修改后的test文件内容如下：

import nest_asyncio
import pytest

from models.nezha import get_room_name

nest_asyncio.apply()


@pytest.mark.asyncio
async def test_get_room_name():
name = await get_room_name('a', 'b')
assert name == 'b'

　　

然后运行pytest时，却又报了这个错误：

ValueError: Can't patch loop of type <class 'uvloop.Loop'>

原因：nest_asyncio不支持uvloop

解决：`pip uninstall uvloop`