BLD: Enable PEP 517

[fangchenli]

After #38852, we could enable PEP 517 by modifying PATH in setup.py or use non-vendored versioneer. See python-versioneer/python-versioneer#193 for details.

[andriyor]

I will recommend switching to setuptools_scm how it was done in matplotlib matplotlib/matplotlib#18971

[fangchenli]

I will recommend switching to setuptools_scm how it was done in matplotlib matplotlib/matplotlib#18971

We hope to get the complete git commit hash, but not sure how to do that using setuptools_scm. I opened an issue pypa/setuptools-scm#577 for this.

[jules-ch]

We can retrieve full commit hash, using setuptools-scm with the following config:

[tool.setuptools_scm]
git_describe_command = [
            "git",
            "describe",
            "--dirty",
            "--tags",
            "--abbrev=40",
            "--long",
            "--match",
            "*[0-9]*",
        ]

This will overide the default git describe command used by setuptools-scm to get the full (40 digits long hex hash).
Then writing a template to generate the same output as today in _version.py should work.

[fangchenli]

@jules-ch Thanks for this. I posted the link to your comment in the corresponding setuptools_scm issue. Hope they can incorporate this to setuptools_scm as a simple setting.

And in the meantime, a PR is welcome if you want to give this a try^^

[nathanjmcdougall]

It is worth noting that as of v0.24 versioneer can be non-vendored, closing this issue:
python-versioneer/python-versioneer#193
If the plan is to move away from versioneer altogether, it may be worth updating this comment accordingly:

pandas/pyproject.toml

Lines 10 to 12 in 75429df

	# uncomment to enable pep517 after versioneer problem is fixed.
	# https://github.com/python-versioneer/python-versioneer/issues/193
	# build-backend = "setuptools.build_meta"