Validate classifiers

[FFY00]

No description provided.

[henryiii]

I'd much rather just have some docs on how to validate with trove_classifiers. I'd prefer not to have a mandatory dependency, and don't want to vendor and have to keep updating, and if the build backend, etc. want to do this, they can decide how they want to include trove_classifiers.

[henryiii]

Classifier validation

You can validate the classifiers using the PyPI package trove_classifiers, which is the canonical source of trove classifier info.

import trove_classifiers

invalid_classifiers = set(metadata.classifiers) - trove_classifiers.classifiers

# Also the deprecated dict if you want it
dep_names = set(metadata.classifiers) & set(trove_classifiers.deprecated_classifiers)
deprecated_classifiers = {k: trove_classifiers.deprecated_classifiers[k] for k in dep_names)