pypi/warehouse

Include admonition about deprecated license classifiers on `/classifiers`

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#17,868 opened on Mar 29, 2025

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Description

What's the problem this feature will solve?

While upgrading the build package to 1.2.2.post1, I've stumbled upon a deprecation notice on Trove license classifiers in pyproject.toml, however there is no mention on this on the respective pypi.org documentation site. I missed the PEP-639 introduction, hence was briefly confused.

Describe the solution you'd like

I would suggest adding an admonition referencing PEP-639, or at least mentioning the changes as documented in https://packaging.python.org/en/latest/guides/writing-pyproject-toml/#classifiers

Additional context

I wasn't sure which issue tracker pypi.org is using, so opening a feature request here is just a guess. I hope this is ok.

Contributor guide

Research direction
Locate the template for the /classifiers page in the warehouse codebase, then add an admonition (e.g., a note or warning) referencing PEP 639 and linking to the packaging guide on writing pyproject.toml.
Tech stack
python
Domain
documentation
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Under 1 hour
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Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
Git
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
90