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Reverse dict iterators don't detect keys changing during iteration
interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or errorStatus: Open.#158254 In python/cpython;C implementation for strptime
extension-modulesC modules in the Modules dirC modules in the Modules dirtype-featureA feature request or enhancementA feature request or enhancementStatus: Open.#158252 In python/cpython;3.14: Windows on Arm build fails since windows-11-arm migrated to windows-11-vs2026-arm
3.14bugs and security fixesbugs and security fixesbuildThe build process and cross-buildThe build process and cross-buildinfraCI, GitHub Actions, buildbots, Dependabot, etc.CI, GitHub Actions, buildbots, Dependabot, etc.Status: Open.#158244 In python/cpython;Double release of
PyBytesWriterinassemble_init()error path corrupts the bytes writer freelistinterpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)type-crashA hard crash of the interpreter, possibly with a core dumpA hard crash of the interpreter, possibly with a core dumpStatus: Open.#158241 In python/cpython;Performance regression:
asyncio.gather()is slower and uses more memory since gh-157213performancePerformance or resource usagePerformance or resource usagestdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directorytype-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or errorStatus: Open.#158239 In python/cpython;Remove unnecessary loads "critical_section" from
_PyCriticalSection_SuspendAllinterpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)performancePerformance or resource usagePerformance or resource usageStatus: Open.#158235 In python/cpython;tracemalloc: _compare_grouped_stats mutates old_group, and a typo in _group_by
pendingThe issue will be closed if no feedback is providedThe issue will be closed if no feedback is providedstdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directorytype-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or errorStatus: Open.#158234 In python/cpython;wsgiref.headers.Headers.__setitem__ deletes the old header before validating the new value
stdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directorytype-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or errorStatus: Open.#158225 In python/cpython;bytearray.take_bytes() bytes object may have incorrect hash
3.15pre-release feature fixes, bugs and security fixespre-release feature fixes, bugs and security fixes3.16new features, bugs and security fixesnew features, bugs and security fixesinterpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or errorStatus: Open.#158219 In python/cpython;dbm.dumb: bytearray keys raise TypeError instead of being converted to bytes
stdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directorytype-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or errorStatus: Open.#158217 In python/cpython;io.StringIOcorrupts its contents after writing astrsubclassinterpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or errorStatus: Open.#158213 In python/cpython;xml.dom.minidomwrites a duplicatexmlnsattributestdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directorytype-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or errorStatus: Open.#158208 In python/cpython;