Replace deprecated utcnow() with now(UTC)

[hugovk]

datetime.datetime.utcnow raises a deprecation warning in Python 3.12: python/cpython#103857.

datetime.UTC is new in 3.11, and is an alias of datetime.timezone.utc, but I think we're fine requiring 3.11+ here.

https://docs.python.org/3/library/datetime.html#datetime.UTC

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📚 Documentation preview 📚: https://cpython-devguide--1097.org.readthedocs.build/

[Mariatta]

Thanks

[Mariatta]

Should we mention on the readme that things should be run using Python 3.11?

[hugovk]

Good idea! I removed the bit about a Python needing venv, because venv was added in 3.3 :)

[CAM-Gerlach]

I was taking a break at the time due to PyCon, sorry, but I'm afraid I don't really understand the rationale for requiring the latest upstream Python version released only a few months ago to be able to render the devguide locally. Sure, many folks will have it one way or another, but it's far from a given as it targets contributors of all experience levels (especially newer ones) and those that make non-code contributions, and if they're using the make workflow they will likely need to figure out how to set the right version manually.

By contrast to how much this is likely to make life harder for many contributors, especially newer ones, it seems easy to avoid this minor issue (a mere warning) all in one line by, e.g., using a ternary conditional:

now_str = str(dt.datetime.now(dt.UTC) if sys.version_info > (3, 10) else dt.datetime.utcnow())

Is there something I'm missing here?

[hugovk]

Sure, please see PR #1107.

[CAM-Gerlach]

Thanks @hugovk , as always!