@edgarrmondragon, thanks for your interest!

I think it's early to do this refactor. We don't have any warning and without it we will miss occurrences of asyncio.iscoroutinefunction in new PRs and merge them.

Do you think it's right time for this? I think we can wait till FastAPI supports Python 3.16 or other versions start to emit deprecation warnings

I think it's early to do this refactor. We don't have any warning and without it we will miss occurrences of asyncio.iscoroutinefunction in new PRs and merge them. Do you think it's right time for this?

That's a good point. Final release of Python 3.14.0 is scheduled for 2025-10-07, and the first RC is only a little over a week away at this point, so I think

• the short time frame
• the fact that more people will start testing their FastAPI apps with Python 3.14 in the coming weeks now that pydantic-core supports it (that's how I discovered this)
• there's no functional differences between the two methods

are good reasons to do this at this point.

I think we can wait till FastAPI supports Python 3.16 or other versions start to emit deprecation warnings

If you want to wait, the earliest I'd recommend is when final 3.14.0 comes out, but that's of course completely up to you.

See also: #14021

Closed in favor of #14022