async-context-manager-with-regular-with / E1145

Message emitted:

Context manager '%s' is async and should be used with 'async with'.

Description:

Used when an async context manager is used with a regular 'with' statement instead of 'async with'.

Problematic code:

from contextlib import asynccontextmanager


@asynccontextmanager
async def async_context():
    yield


with async_context():  # [async-context-manager-with-regular-with]
    print("This will cause an error at runtime")

Correct code:

import asyncio
from contextlib import asynccontextmanager


@asynccontextmanager
async def async_context():
    yield


async def main():
    async with async_context():
        print("This works correctly")

Related links:

• PEP 492 - Coroutines with async and await syntax

• contextlib.asynccontextmanager

Created by the typecheck checker.