Classifiers are one bit of Python project metadata that predates PyPI. Classifiers are weird. They were around in setuptools days, and are still here with pyproject.toml.

• What are they?
• Why do we need them?
• Do we need them?
• Which classifiers should I include?
• Why are they called "trove classifiers" in the Python docs

Brett Cannon joins the show to discuss these wacky bits of metadata.

Here's an example, from pytest-crayons:

[project]
...
classifiers = [
    "License :: OSI Approved :: MIT License",
    "Framework :: Pytest"
    ]

Special Guest: Brett Cannon.

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Links:

• Classifiers · PyPI
• pyproject.toml | peps.python.org">PEP 621 – Storing project metadata in pyproject.toml | peps.python.org
• Packaging Python Projects — Python Packaging User Guide — Configuring metadata
• peps.python.org">PEP 639 – Improving License Clarity with Better Package Metadata | peps.python.org
• SPDX