2256 as ratio

[mutricyl]

• Closes Be able to use as_ratio option in PrettyFormatter #2256 (insert issue number)

• Executed pre-commit run --all-files or pixi run lint --all-files with no errors

• The change is fully covered by automated unit tests

• Documented in docs/ as appropriate

• Added an entry to the CHANGES file

• as_ratio option allowed in all formatters

• new unit modifier to go for negative exponents instead of ratio: §

• remove duplicated code from pint.formatting.format (delegates.formatter._format_helpers.format used instead)

• correct docstring of delegates.formatter._format_helpers.format

[codspeed-hq]

CodSpeed Performance Report

Merging this PR will not alter performance

_{Comparing mutricyl:2256_as_ratio (c5c589e) with master (6049a9c)}

Summary

✅ 448 untouched benchmarks

[andrewgsavage]

Could you use a symbol that's more commonly on keyboards, ie not §? ^ would be good since this affects exponents

[mutricyl]

No problem, i am far from my computer, i'll change when i come back. Le dim. 15 févr. 2026, 23:41, andrewgsavage ***@***.***> a écrit :

…

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