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Title: Fix title() and capitalize() by joshuamegnauth54 · Pull Request #7717 · RustPython/RustPython · GitHub

Open Graph Title: Fix title() and capitalize() by joshuamegnauth54 · Pull Request #7717 · RustPython/RustPython

X Title: Fix title() and capitalize() by joshuamegnauth54 · Pull Request #7717 · RustPython/RustPython

Description: I fixed title() and capitalize() as well as enabled their respective tests. I fixed both by following CPython's logic closely, including implementing a workaround for sigma. Besides that, I removed an unneeded dependency (unicode-casing) by using icu4x instead. This helps with consistency and removes outdated Unicode tables from the final RustPython binary. Summary by CodeRabbit Bug Fixes Improved Unicode string case behavior (capitalize, title, istitle), including correct handling of Greek sigma, Turkish dotted I, German ß, combining marks, emoji-leading text, and preservation of invalid bytes. Chores Switched to ICU-based Unicode libraries and added a formatting/helper dependency. Refactor Reworked titlecasing and ASCII-bytes logic for clarity and reuse. Tests Enabled and expanded Unicode title/capitalize tests covering multiple edge cases.

Open Graph Description: I fixed title() and capitalize() as well as enabled their respective tests. I fixed both by following CPython's logic closely, including implementing a workaround for sigma. Besides that, I rem...

X Description: I fixed title() and capitalize() as well as enabled their respective tests. I fixed both by following CPython's logic closely, including implementing a workaround for sigma. Besides that, I...

Opengraph URL: https://github.com/RustPython/RustPython/pull/7717

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9d8d34e PyBytes.title should be ASCII-only. joshuamegnauth54 Apr 26, 2026 https://github.com/RustPython/RustPython/pull/7717/commits/9d8d34e5e77602dec556832f090809e83ca8a354
edc87f2 Use icu_casemap over unicode-casing for titles joshuamegnauth54 Apr 28, 2026 https://github.com/RustPython/RustPython/pull/7717/commits/edc87f24d5584611c3bfd9c72ca2f9e6e917de66
58d8b7c Use icu_casemap for capitalize() joshuamegnauth54 Apr 30, 2026 https://github.com/RustPython/RustPython/pull/7717/commits/58d8b7cbae74de426faf9ba218514aee71bb228d
ce75f32 Match CPython's title() exactly joshuamegnauth54 May 2, 2026 https://github.com/RustPython/RustPython/pull/7717/commits/ce75f328cec83c3ec715abeced2d66fa401fd666
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