Question

我在此代码中使用python 3.8

async def main():
    pass

async def build():
    pass

asyncio.create_task(build())
loop = asyncio.get_event_loop()
asyncio.create_task(main())
pending = asyncio.all_tasks()
loop.run_until_complete(asyncio.gather(*pending))

并出现以下错误

sys：1：RuntimeWarning：从未等待协程'build'

我在这里想念什么？不应该等到所有任务完成才运行？

Answer 1

由于创建任务时循环未运行，因此pytest -s test.py =============================== test session starts ============================ platform linux -- Python 3.7.3, pytest-5.2.4, py-1.8.0, pluggy-0.13.1 rootdir: /home/user collected 2 items test.py .. =============================== warnings summary =============================== anaconda3/lib/python3.7/site-packages/_pytest/mark/structures.py:325 ~/anaconda3/lib/python3.7/site-packages/_pytest/mark/structures.py:325: PytestUnknownMarkWarning: Unknown pytest.mark.webtest - is this a typo? You can register custom marks to avoid this warning - for details, see https://docs.pytest.org/en/latest/mark.html PytestUnknownMarkWarning, -- Docs: https://docs.pytest.org/en/latest/warnings.html =============================== 2 passed, 1 warnings in 0.03s ===================无法将任务附加到任务上。

可以通过将asyncio替换为asyncio.create_task()来解决此问题。

可以使用loop.create_task()检索全部错误，因此asyncio.gather(..., return_exceptions=True)将引发gather()。

从未等待过python asyncio协程

1 个答案: