RuntimeError: Cannot run the event loop while another loop is running

古城微笑少年丶 2023-07-03 12:19 24阅读 0赞

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][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\`

[https_github.com_erdewit_nest_asyncio]: https://github.com/erdewit/nest_asyncio