MNT: Prefer capitalized logging levels #30339
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matplotlib#30302 just introduced literals for the log levels. Previously, the situation was a bit vague: While the docstring described the levels as all lowercase, in fact any casing is accepted. This PR changes the preferred casing to be all-capitalized in analogy to the logging standard library, which only supports this casing. Lowercase remains supported because it's not worth an API breakage. We might later consider to also accept logging levels directly, i.e. `logging.DEBUG` to be more congruent with the logging library. But this can be done any time. It's important to get this PR in soon to not release the typing Literal in lowercase form.
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Documentation: devdocs
QuLogic
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Jul 21, 2025
tacaswell
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Jul 22, 2025
Co-authored-by: Thomas A Caswell <tcaswell@gmail.com>
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#30302 just introduced literals for the log levels. Previously, the situation was a bit vague: While the docstring described the levels as all lowercase, in fact any casing is accepted. This PR changes the preferred casing to be all-capitalized in analogy to the logging standard library, which only supports this casing. Lowercase remains supported because it's not worth an API breakage.
We might later consider to also accept logging levels directly, i.e.
logging.DEBUGto be more congruent with the logging library. But this can be done any time. It's important to get this PR in soon to not release the typing Literal in lowercase form.