Support 3.10

Hello,
Can you guys please add support for 3.10 it was released today.

For reference, it took 17 hours for Python 3.9 (#148) and 20 days for Python 3.8 (#30) :)

3.10 was released at 20:00 UTC yesterday, so 13:00 UTC today is your target!

Hello everyone!
Python 3.10.0 is already available via the setup-python action.
Unfortunately, it is not pre-installed on the images yet. New images with Python 3.10.0 will be deployed next week.

It wasn't two hours ago, but is now! (12 hours after release 👍 )

Thank you!

For anyone who comes across this, make sure to use quotes around 3.10, i.e. "3.10", as 3.10 as a float gets converted to 3.1

For anyone who comes across this, make sure to use quotes around 3.10, i.e. "3.10", as 3.10 as a float gets converted to 3.1

For a longer explanation see: https://dev.to/hugovk/the-python-3-1-problem-85g

Special casing 3.10

Fix running tests with Python 3.10

Revert to Ubuntu 18.04

fix: quote "3.10" in ci

Thanks, but I when I will be available for GitHub actions? It's still problem with error:

Error: Version 3.10 with arch x64 not found

Available versions:
2.7.18 (x64)
3.5.10 (x64)
3.6.15 (x64)
3.7.12 (x64)
3.8.12 (x64)
3.9.7 (x64)

@pbelskiy

@pbelskiy You need to use actions/setup-python@v2 not actions/setup-python@v1.

Ah, this explains why setup-nox can't find 3.10, it activates all (pre-)installed versions.

Personally, I'd be tempted to at least consider making the float 3.1 map to "3.10" - the number of people using 3.1 should in theory be zero, and the number of users wondering why 3.10 produces a failure due to lack of "3.1" for most architectures is quite high, judging from twitter. After all, the fact that floats map to string versions is just a shortcut anyway - and a shortcut that has an unfortunate consequence for 3.10. By the time 3.20 rolls around, 3.2 should be even safer to map to 3.20, etc. (For those considering this a YAML bug, it has nothing to do with YAML - no language I know of maps 3.10 to anything but the float 3.1, and yaml does differentiate unambiguously between 3.10 (float) and "3.10" (string). It's just a shortcut that setup-python also accepts floats for version numbers. "3.1" would still access 3.1, if it's supported (I think it is on some platforms?)

It's kind of weird, so I probably would just continue let people correct their usage to all strings, but, just a thought.

Is 3.10 going to be installed by default at some point? It would be nice for it to be picked up by setup-nox, and I assume it would be faster to use, too.