`UP035`: Rewrite `typing.Callable` to `collections.abc.Callable` for Python 3.9.2+

[ngnpope]

There was a bug in Python 3.9.0 and 3.9.1 which resulted in pyupgrade only making this rewrite on 3.10+.

The issue was resolved in Python 3.9.2 and we're now on Python 3.9.16. It seems a shame to not support this.

See asottile/pyupgrade#677 for context.

[charliermarsh]

We probably need to support minor version-based minimums in order to do this, right? Like, we can't enable this for all Python 3.9.X versions, can we?

[ngnpope]

That's right, it can't be enabled for 3.9.0 or 3.9.1.

[ericbn]

flake8-pep585 makes no distinction between any of the 3.9.x versions, and supports this for py39 as a whole.

[charliermarsh]

I think those suggestions are technically incorrect for Python 3.9.0 and Python 3.9.1 though. If you make those changes, your imports will fail on those specific minor versions.

[ericbn]

Sorry, I see how pyupgrade went on the safer side. Ruff inherited that and it makes sense.

[ericbn]

A solution for users with Python >=3.9.2,<3.10 could be manually configuring the TID251 rule with:

[tool.ruff.flake8-tidy-imports]
[tool.ruff.flake8-tidy-imports.banned-api]
"typing.Callable".msg = "Use collections.abc.Callable instead."

[ngnpope]

That's a neat workaround. I'm using 3.9+ everywhere so it's viable.

I would hope that people aren't using .0 or .1 by now, but reality is never the ideal. I guess you can close this @charliermarsh if you're not wanting to special case this to check the patch version.