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Disagreement with CPython for str.islower/isupper/swapcase #7526

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#7583
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Disagreement with CPython for str.islower/isupper/swapcase#7526
#7583
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C-compatA discrepancy between RustPython and CPython

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@sunmy2019
sunmy2019
opened on Mar 28, 2026

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".isupper() == False,
    "Σίσυφος".swapcase() == "σΊΣΥΦΟΣ",
)

Activity

  1. sunmy2019
    added
    C-compatA discrepancy between RustPython and CPython
    on Mar 28, 2026
  2. joshuamegnauth54
    added 3 commits that reference this issue on Apr 4, 2026

    fix: Swapcase must handle multibyte expansions

    d749d6f

    fix: Swapcase must handle multibyte expansions

    0fc94a8

    fix: Swapcase must handle multibyte expansions

    2e1a0f4
  3. youknowone
    added a commit that references this issue on Apr 6, 2026

    fix: Swapcase must handle multibyte expansions (#7559)

    e009cc0
  4. joshuamegnauth54
    added 2 commits that reference this issue on Apr 12, 2026

    fix: Handle char expansion in islower, isupper

    113ba92

    fix: Handle char expansion in islower, isupper

    44ef516
  5. youknowone
    added a commit that references this issue on Apr 14, 2026

    fix: Handle char expansion in islower, isupper (#7583)

    4bbabe5
  6. youknowone
    closed this as completedin #7583on Apr 14, 2026
  7. youknowone
    added 2 commits that reference this issue on Sep 16, 2026

    fix: Swapcase must handle multibyte expansions (#7559)

    6493f9a

    fix: Handle char expansion in islower, isupper (#7583)

    1584276
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