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1. Commits on Aug 3, 2026

   • [3.15] gh-98820: Fix quadratic time in csv.Sniffer for quoted fields (GH-154867)

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     serhiy-storchaka

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     claude

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   • [3.15] gh-109638: Fix exponential time in csv.Sniffer for doubled quotes (#154868)

     serhiy-storchaka

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2. Commits on Jul 31, 2026

   • [3.15] gh-80678: Document the preferred delimiters of csv.Sniffer (GH-154336) (#154589)

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3. Commits on Jul 21, 2026

   • [3.15] gh-103925: Fix csv.Sniffer for a quoted field ending a CRLF line (GH-103926) (GH-154322)

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4. Commits on Oct 23, 2025

   • gh-137627: Make `csv.Sniffer.sniff()` delimiter detection 1.6x faster (#137628)

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     maurycy

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     picnixz

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5. Commits on Sep 29, 2025

   • gh-76007: Deprecate `__version__` attribute (#138675)

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6. Commits on Jan 18, 2025

   • gh-118761: Improve import time for `csv` (#128858)

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     picnixz

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7. Commits on Jul 19, 2024

   • gh-121905: Consistently use "floating-point" instead of "floating point" (GH-121907)

     serhiy-storchaka

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8. Commits on Feb 5, 2024

   • gh-114628: Display csv.Error without context (#115005)

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     terryjreedy

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9. Commits on Jan 18, 2024

   • gh-114123: Migrate docstring from _csv to csv (#114124)

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10. Commits on Apr 12, 2023

    • gh-67230: add quoting rules to csv module (GH-29469)

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      smontanaro

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11. Commits on Dec 9, 2022

    • bpo-44512: Fix handling of extrasactions arg to csv.DictWriter with mixed or upper case (#26924)

      akulakov

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12. Commits on Nov 10, 2022

    • gh-99281: [csv] remove try/except, `complex` always exists (#99282)

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13. Commits on Aug 25, 2022

    • gh-76728: Coerce DictReader and DictWriter fieldnames argument to a list (GH-32225)

      dignissimus

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14. Commits on May 8, 2022

    • Add __class_getitem__ to csv.DictReader and csv.DictWriter (#92393)

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    • bpo-44712: Replace "type(literal)" with corresponding builtin types (GH-27294)

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      serhiy-storchaka

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15. Commits on Jul 30, 2021

    • bpo-43625: Enhance csv sniffer has_headers() to be more accurate (GH-26939)

      akulakov

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16. Commits on May 10, 2019

    • bpo-27497: Add return value to csv.DictWriter.writeheader (GH-12306)

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      Rémi Lapeyre

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      vstinner

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17. Commits on Jan 31, 2019

    • bpo-34003: Use dict instead of OrderedDict in csv.DictReader (GH-8014)

      

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      rhettinger

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18. Commits on Feb 9, 2018

    • bpo-30157: Fix csv.Sniffer.sniff() regex pattern. (GH-5601)

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      serhiy-storchaka

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      jake-jake-jake

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19. Commits on Feb 6, 2017

    • Issue #29405: Make total calculation in _guess_delimiter more accurate.

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20. Commits on Oct 21, 2016

    • Issue #18219: Optimize csv.DictWriter for large number of columns.

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      methane

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21. Commits on Sep 8, 2016

    • #27364: fix "incorrect" uses of escape character in the stdlib.

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      bitdancer

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22. Commits on Aug 30, 2016

    • Issue #27842: The csv.DictReader now returns rows of type OrderedDict.

      rhettinger

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23. Commits on Nov 14, 2015

    • Issue #23883: Add missing APIs to __all__; patch by Jacek Kołodziej

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24. Commits on Mar 30, 2015

    • Issue #23171: csv.Writer.writerow() now supports arbitrary iterables.

      serhiy-storchaka

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25. Commits on Mar 29, 2015

    • Issue #14260: The groupindex attribute of regular expression pattern object

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      serhiy-storchaka

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26. Commits on Nov 19, 2013

    • #19449: Handle non-string keys when generating 'fieldnames' error.

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      bitdancer

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27. Commits on Jun 29, 2013

    • #18155: Regex-escape delimiter, in case it is a regex special char.

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28. Commits on Mar 16, 2011

    • #11565: Merge with 3.1.

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    • #11565: Fix several typos. Patch by Piotr Kasprzyk.

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29. Commits on Oct 27, 2010

    • #5975: add unix_dialect to csv module.

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30. Commits on Feb 23, 2010

    • Merged revisions 78384 via svnmerge from

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31. Commits on Oct 4, 2009

    • Merged revisions 75231 via svnmerge from

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    • Merged revisions 74779-74786,74793,74795,74811,74860-74861,74863,74876,74886,74896,74901,74903,74908,74912,74930,74933,74943,74946,74952-74955,75015,75019,75032,75068,75076,75095,75098,75102,75129,…

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