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1. Commits on Oct 22, 2026

   • [3.15] gh-159739: Respect readline limits after a short read (GH-159974) (#160246)

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     miss-islington

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     jelle-openai

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2. Commits on Jun 23, 2026

   • [3.15] gh-151596: Add missing argument 'size' to pure-Python implementation of `TextIOBase.readline` (GH-151679) (GH-151870)

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     miss-islington

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     Saber0324

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3. Commits on May 24, 2026

   • [3.15] gh-150285: Fix too long docstrings in the io module (GH-150287) (GH-150332)

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     miss-islington

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     serhiy-storchaka

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4. Commits on Jan 15, 2026

   • gh-143602: Fix duplicate buffer exports in io.BytesIO.write (#143629)

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     superboy-zjc

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5. Commits on Jan 9, 2026

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

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     superboy-zjc

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6. Commits on Nov 18, 2025

   • gh-129005: Remove copies from _pyio using take_bytes (#141539)

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     cmaloney

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7. Commits on Oct 27, 2025

   • gh-140607: Validate returned byte count in RawIOBase.read (#140611)

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     3 peopleauthored
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8. Commits on Oct 21, 2025

   • gh-69528: Distinguish between file modes "wb+" and "rb+" (GH-137834)

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     StanFromIreland

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     zhangyangyu

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9. Commits on Jul 4, 2025

   • gh-133982: Test _pyio.BytesIO in free-threaded tests (gh-136218)

     cmaloney

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10. Commits on May 21, 2025

    • gh-62184: Remove _pyio import of _io.FileIO (gh-134192)

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      cmaloney

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    • gh-133982: Run unclosed file test on all io implementations (gh-134165)

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      cmaloney

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    • gh-71253: Match _io exception in _pyio (gh-133985)

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      cmaloney

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      ZeroIntensity

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11. Commits on Apr 30, 2025

    • gh-133036: Deprecate codecs.open (#133038)

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12. Commits on Mar 7, 2025

    • gh-117151: IO performance improvement, increase io.DEFAULT_BUFFER_SIZE to 128k (GH-118144)

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      morotti

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      rmmancom

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    • gh-129011: Update comments in FileIO to match current code (#129012)

      cmaloney

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13. Commits on Mar 6, 2025

    • gh-127647: Add typing.Reader and Writer protocols (#127648)

      srittau

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14. Commits on Feb 7, 2025

    • gh-129005: Align FileIO.readall between _pyio and _io (#129705)

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      cmaloney

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      vstinner

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15. Commits on Feb 6, 2025

    • gh-129005: Update _pyio.BytesIO to use bytearray.resize on write (#129702)

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      cmaloney

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      vstinner

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16. Commits on Feb 2, 2025

    • Revert "gh-129005: Align FileIO.readall() allocation (#129458)" (#129572)

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      cmaloney

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17. Commits on Jan 31, 2025

    • Revert "gh-129005: _pyio.BufferedIO remove copy on readall (#129454)" (#129500)

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      cmaloney

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18. Commits on Jan 30, 2025

    • gh-129005: _pyio.BufferedIO remove copy on readall (#129454)

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      cmaloney

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    • gh-129005: Align FileIO.readall() allocation (#129458)

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      cmaloney

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19. Commits on Jan 28, 2025

    • gh-129005: Avoid copy in _pyio.FileIO.readinto() (#129324)

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      cmaloney

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20. Commits on Dec 2, 2024

    • gh-109523: Raise a BlockingIOError if reading text from a non-blocking stream cannot immediately return bytes. (GH-122933)

      giosiragusa

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21. Commits on Nov 1, 2024

    • gh-120754: _io Ensure stat cache is cleared on fd change (#125166)

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      cmaloney

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22. Commits on Oct 8, 2024

    • gh-90102: Fix pyio _isatty_open_only() (#125089)

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      cmaloney

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    • gh-90102: Remove isatty call during regular open (#124922)

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      cmaloney

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      vstinner

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23. Commits on Sep 18, 2024

    • gh-120754: Refactor I/O modules to stash whole stat result rather than individual members (#123412)

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      cmaloney

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24. Commits on Jul 4, 2024

    • gh-120754: Reduce system calls in full-file FileIO.readall() case (#120755)

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      4 peopleauthored
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25. Commits on Jun 13, 2024

    • gh-120417: Add #noqa to used imports in the stdlib (#120421)

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      vstinner

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26. 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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27. 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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28. Commits on Jan 8, 2024

    • gh-80109: Fix io.TextIOWrapper dropping the internal buffer during write() (GH-22535)

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      ZackerySpytz

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29. Commits on May 31, 2023

    • gh-62948: IOBase finalizer logs close() errors (#105104)

      vstinner

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30. Commits on Nov 26, 2022

    • bpo-45975: Simplify some while-loops with walrus operator (GH-29347)

      nickdrozd

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