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GH-47550: [Python] Use SPDX convention for license metadata on PyPI #47551

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GH-47550: [Python] Use SPDX convention for license metadata on PyPI #47551

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3 changes: 1 addition & 2 deletions python/pyproject.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -32,9 +32,8 @@ dynamic = ["version"]
requires-python = ">=3.10"
description = "Python library for Apache Arrow"
readme = {file = "README.md", content-type = "text/markdown"}
license = {text = "Apache Software License"}
license = "Apache-2.0"
classifiers = [
'License :: OSI Approved :: Apache Software License',
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@pitrou pitrou Sep 15, 2025

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Is there a reason to remove the classifier?

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@martin-traverse martin-traverse Sep 17, 2025

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@pitrou - The Python packaging tools spit out repeated and fairly loud warnings about this:

/private/var/folders/cn/7nm4fws564l2dl8k7n2wfgjm0000gn/T/build-env-6gz668wo/lib/python3.12/site-packages/setuptools/dist.py:759: SetuptoolsDeprecationWarning: License classifiers are deprecated.
!!

        ********************************************************************************
        Please consider removing the following classifiers in favor of a SPDX license expression:

        License :: OSI Approved :: Apache Software License

        See https://packaging.python.org/en/latest/guides/writing-pyproject-toml/#license for details.
        ********************************************************************************

!!
  self._finalize_license_expression()

I have removed them in the packages I am responsible for because of this warning. However, it seems that a lot of packages are using SPDX license IDs in the "license" field but still keeping the classifiers.

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@pitrou pitrou Sep 17, 2025

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Ok, it seems that NumPy have removed their license classifier, so I'm fine with that as well.

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@paddyroddy paddyroddy Sep 30, 2025

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Yeah, as said above, it seems they're phasing them out

'Programming Language :: Python :: 3.10',
'Programming Language :: Python :: 3.11',
'Programming Language :: Python :: 3.12',
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