[3.13] gh-158102: Add tests for the slice C API (GH-158120) - #158293
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serhiy-storchaka merged 1 commit intoSep 29, 2026
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Test PySlice_Check(), PySlice_New(), PySlice_GetIndices(), PySlice_Unpack(), PySlice_AdjustIndices() and PySlice_GetIndicesEx() -- both the macro and the deprecated function. Document the length and step precondition of PySlice_AdjustIndices() (cherry picked from commit 8c056c3) Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com> Co-authored-by: Victor Stinner <vstinner@python.org>
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Test
PySlice_Check(),PySlice_New(),PySlice_GetIndices(),PySlice_Unpack(),PySlice_AdjustIndices()andPySlice_GetIndicesEx().PySlice_GetIndicesEx()is tested both as a macro and as a deprecated function, including the case when__index__()resizes the sequence whose size is passed as the length: the macro evaluates it afterPySlice_Unpack(), the function before the call.(cherry picked from commit 8c056c3)
The conflicts were only in the registration lists, which have diverged from main:
Modules/Setup.stdlib.in,Modules/_testlimitedcapi.c,Modules/_testlimitedcapi/parts.hand the two PCbuild files.Modules/_testlimitedcapihas noslots.chere, soslice.cis registered betweenset.candsys.c, and the registration calls are inPyInit__testlimitedcapi(), which returnsPyObject *, so the new check returnsNULLinstead of-1.In
Modules/_testlimitedcapi/slice.c,Py_TARGET_ABI3Tdoes not exist in 3.13 -- there is noInclude/pyabi.h-- so the limited C API is simply not tested in a free-threading build, like in the other files ofModules/_testlimitedcapi.