Bug report

Bug description:

(This is not an asyncio bug! I am just using asyncio.TaskGroup() as an example.)

import asyncio
def foo():
    with asyncio.TaskGroup() as g:  # BUG: should be `async with`
        pass

This currently gives an error ending in

TypeError: 'TaskGroup' object does not support the context manager protocol (missed __exit__ method)

That's not very clear about what's wrong. Maybe when issuing this TypeError we could check if the object supports __aexit__ and __aenter__, and if so, suggest something like "maybe try async with ?".

CPython versions tested on:

3.12, 3.13, 3.14

Operating systems tested on:

No response

Linked PRs

• gh-128398: improve error message when incorrectly with and async with #132218