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Add Python 3.15 calendar datetime and difflib updates by JelleZijlstra · Pull Request #15729 · python/typeshed · GitHub

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Add Python 3.15 calendar datetime and difflib updates - #15729

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JelleZijlstra merged 3 commits into
python:mainfrom
JelleZijlstra:codex/python315-calendar-difflib
May 8, 2026
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Add Python 3.15 calendar datetime and difflib updates#15729
JelleZijlstra merged 3 commits into
python:mainfrom
JelleZijlstra:codex/python315-calendar-difflib

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JelleZijlstra commented May 8, 2026

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Summary

  • Add Python 3.15 calendar additions for standalone month names and HTMLCalendar.formatmonthpage.
  • Update renamed 3.15 datetime ISO/strptime positional-only parameters, including datetime.fromisoformat.
  • Add difflib.unified_diff(color=...).
  • Remove corresponding 3.15 stubtest allowlist entries.

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JelleZijlstra marked this pull request as ready for review May 8, 2026 20:05

github-actions Bot commented May 8, 2026

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According to mypy_primer, this change has no effect on the checked open source code. 🤖🎉

srittau approved these changes May 8, 2026
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Comment thread stdlib/calendar.pyi
Comment on lines +224 to +225
standalone_month_name: Sequence[str]
standalone_month_abbr: Sequence[str]

srittau May 8, 2026

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

The situation here is more complicated. There are instances of _localized_month, which isn't a full Sequence, but has other format field. Same actually for month_name and month_abbr. day_name and day_abbr are not instances of _localized_day. But the latter has been true since at least 3.10, so I'm fine with using Sequence in this PR, although I would prepare a followup, changing these fields.

Another thing I noticed, although that's probably legacy and possibly also out of scope: Through __getattr__, this module has two constants "January" (equaling 1), and "February" (equaling 2).

JelleZijlstra May 8, 2026

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

Thanks, I'll prepare a followup for this.

Regarding the __getattr__, seems better to keep those out of the stub unless someone really needs them.

JelleZijlstra merged commit f74b24b into python:main May 8, 2026
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JelleZijlstra deleted the codex/python315-calendar-difflib branch May 8, 2026 20:31
JelleZijlstra mentioned this pull request May 9, 2026
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srittau srittau approved these changes

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