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1. Commits on Sep 7, 2026

   • [3.13] gh-157048: check for buffer errors before mutating in BytesIO.__init__ (GH-157049) (#157070)

     ngoldbaum

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2. Commits on Aug 30, 2026

   • [3.13] gh-72353: Continue reading from the console after ignored Ctrl+C (GH-155434) (GH-156591)

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     4 peopleauthored
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3. Commits on Aug 21, 2026

   • [3.13] gh-153539: Fix use-after-free in TextIOWrapper.tell() with a reentrant decoder (GH-153540) (GH-156195)

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     serhiy-storchaka

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     tonghuaroot

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4. Commits on Aug 18, 2026

   • [3.13] gh-113318: Fix @getter and @setter in Argument Clinic (GH-155778) (GH-156012)

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     serhiy-storchaka

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5. Commits on Jun 24, 2026

   • [3.13] gh-151814: Fix unbounded memory growth from repeated empty writes to `io.TextIOWrapper` (GH-151817) (#152073)

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     miss-islington

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     StanFromIreland

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     36fd455View commit details

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6. Commits on Jun 10, 2026

   • [3.13][3.15] gh-143008: Fix race re-initializing TextIOWrapper (#151203) (#151227)

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     vstinner

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     cmaloney

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7. Commits on May 26, 2026

   • [3.13] gh-150285: Fix too long docstrings in the io module (GH-150287) (GH-150458) (GH-150470)

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     serhiy-storchaka

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8. Commits on May 19, 2026

   • [3.13] gh-149983: Fix PyErr_NoMemory call without GIL in winconsoleio.c (GH-149984) (GH-150112)

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     miss-islington

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     aisk

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     23fcb48View commit details

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9. Commits on Feb 2, 2026

   • [3.13] gh-144380: Fix incorrect type check in `buffered_iternext()` (GH-144381) (#144390)

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     miss-islington

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     ruiyangke

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10. Commits on Jan 12, 2026

    • [3.13] gh-143378: Fix use-after-free when BytesIO is concurrently mutated during write operations (GH-143408) (GH-143600)

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      serhiy-storchaka

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      superboy-zjc

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      dcc6117View commit details

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11. Commits on Dec 16, 2025

    • [3.13] gh-142594: fix by property calls io.TextIOWrapper.detach (GH-142706) (GH-142757)

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      cmaloney

      and

      yihong0618

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12. Commits on Nov 12, 2025

    • [3.13] gh-141311: Avoid assertion in BytesIO.readinto() (GH-141333) (GH-141478)

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      cmaloney

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    • [3.13] gh-141314: Fix TextIOWrapper.tell() assertion failure with standalone carriage return (GH-141331) (GH-141452)

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      mohsinm-dev

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13. Commits on Oct 29, 2025

    • [3.13] gh-140607: Validate returned byte count in RawIOBase.read (GH-140611) (#140730)

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      3 peopleauthored
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14. Commits on Jul 1, 2025

    • [3.13] gh-135607: remove null checking of weakref list in dealloc of extension modules and objects (#135614) (#136126)

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      3 peopleauthored
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15. Commits on Jun 2, 2025

    • [3.13] gh-134908: Protect `textiowrapper_iternext` with critical section (gh-134910) (gh-135040)

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      colesbury

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      duaneg

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16. Commits on May 4, 2025

    • [3.13] gh-122559: Synchronize C and Python implementation of the io module about pickling (GH-122628) (GH-133381)

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      serhiy-storchaka

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17. Commits on Mar 11, 2025

    • [3.13] gh-131082: Add missing guards for WIN32_LEAN_AND_MEAN (GH-131044) (#131084)

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      miss-islington

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      maxbachmann

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18. Commits on Dec 19, 2024

    • [3.13] gh-128083: Fix macro redefinition warning in clinic. (GH-127950) (#128102)

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      ZeroIntensity

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19. Commits on Nov 30, 2024

    • [3.13] gh-127341: Argument Clinic: fix compiler warnings for getters with docstrings (GH-127310) (#127431)

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      ZeroIntensity

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      erlend-aasland

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      a442c87View commit details

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    • [3.13] gh-124008: Fix calculation of the number of written bytes for the Windows console (GH-124059) (GH-127325)

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      miss-islington

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      serhiy-storchaka

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20. Commits on Nov 25, 2024

    • [3.13] gh-127182: Fix `io.StringIO.__setstate__` crash when `None` is the first value (GH-127219) (#127262)

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      3 peopleauthored
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21. Commits on Jul 25, 2024

    • [3.13] gh-121489: Export private _PyBytes_Join() again (GH-122267) (#122287)

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      miss-islington

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      cdce8p

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22. Commits on Jun 24, 2024

    • [3.13] gh-113993: Allow interned strings to be mortal, and fix related issues (GH-120520) (GH-120945)

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      encukou

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      ericsnowcurrently

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      9769b7aView commit details

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23. Commits on Jun 19, 2024

    • [3.13] gh-119506: fix `_io.TextIOWrapper.write()` write during flush (GH-119507) (#119964)

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      3 peopleauthored
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24. Commits on May 29, 2024

    • [3.13] gh-119661: Add _Py_SINGLETON() include in Argumenet Clinic (#119712) (#119716)

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      vstinner

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25. Commits on May 3, 2024

    • gh-116322: Add Py_mod_gil module slot (#116882)

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      swtaarrs

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26. Commits on Apr 23, 2024

    • gh-117151: optimize BufferedWriter(), do not buffer writes that are the buffer size (GH-118037)

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      morotti

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      rmmancom

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      8fa1248View commit details

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27. Commits on Apr 12, 2024

    • gh-117764: Add signatures for __reduce__ and __reduce_ex__ in the _io module (GH-117773)

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      serhiy-storchaka

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28. Commits on Mar 22, 2024

    • gh-117068: Remove useless code in bytesio.c:resize_buffer() (GH-117069)

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      NGRsoftlab

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      ngr-ilmarh

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      63d6f26View commit details

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29. Commits on Mar 18, 2024

    • gh-115538: Emit warning when use bool as fd in _io.WindowsConsoleIO (GH-116925)

      aisk

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30. Commits on Feb 17, 2024

    • gh-95782: Fix io.BufferedReader.tell() etc. being able to return offsets < 0 (GH-99709)

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      6t8k

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31. Commits on Feb 12, 2024

    • gh-111140: Adds PyLong_AsNativeBytes and PyLong_FromNative[Unsigned]Bytes functions (GH-114886)

      zooba

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32. Commits on Feb 9, 2024

    • gh-115059: Flush the underlying write buffer in io.BufferedRandom.read1() (GH-115163)

      serhiy-storchaka

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33. Commits on Feb 5, 2024

    • gh-82626: Emit a warning when bool is used as a file descriptor (GH-111275)

      serhiy-storchaka

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      652fbf8View commit details

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