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Title: Disagreement with CPython for str.islower/isupper/swapcase · Issue #7526 · RustPython/RustPython · GitHub

Open Graph Title: Disagreement with CPython for str.islower/isupper/swapcase · Issue #7526 · RustPython/RustPython

X Title: Disagreement with CPython for str.islower/isupper/swapcase · Issue #7526 · RustPython/RustPython

Description: Python Documentation or reference to CPython source code tested on current main: 1a9b10e There are many examples and I picked one. # the following is True in CPython and False in RustPython print( "\u0295".islower() == True, "\u1c89".isu...

Open Graph Description: Python Documentation or reference to CPython source code tested on current main: 1a9b10e There are many examples and I picked one. # the following is True in CPython and False in RustPython print( ...

X Description: Python Documentation or reference to CPython source code tested on current main: 1a9b10e There are many examples and I picked one. # the following is True in CPython and False in RustPython print( ...

Opengraph URL: https://github.com/RustPython/RustPython/issues/7526

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#7583https://github.com/RustPython/RustPython/pull/7583
Disagreement with CPython for str.islower/isupper/swapcasehttps://github.com/RustPython/RustPython/issues/7526#top
#7583https://github.com/RustPython/RustPython/pull/7583
C-compatA discrepancy between RustPython and CPythonhttps://github.com/RustPython/RustPython/issues?q=state%3Aopen%20label%3A%22C-compat%22
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on Mar 28, 2026https://github.com/RustPython/RustPython/issues/7526#issue-4160044264
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