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GeezerVison is showing github.com — Add Python 3.15 calendar datetime and difflib updates by JelleZijlstra · Pull Request #15729 · python/typeshed

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@JelleZijlstra

@JelleZijlstra 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.

Relevant report entries

  • Added calendar.standalone_month_name, calendar.standalone_month_abbr, and HTMLCalendar.formatmonthpage() (CPython source: https://github.com/python/cpython/blob/e81025e6d2e01e38c5a5b656af5739ac9df5ff55/Lib/calendar.py)
  • Renamed datetime ISO/strptime positional-only parameters to string (CPython source: https://github.com/python/cpython/blob/e81025e6d2e01e38c5a5b656af5739ac9df5ff55/Modules/_datetimemodule.c)
  • Added difflib.unified_diff(color=...) (CPython PR: gh-133722: Add Difflib theme to _colorize and 'color' option to difflib.unified_diff cpython#133725; source: https://github.com/python/cpython/blob/main/Lib/difflib.py)

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@JelleZijlstra
Add Python 3.15 calendar datetime and difflib updates
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JelleZijlstra added 2 commits May 8, 2026 13:01
@JelleZijlstra
Guard datetime 3.15 parameter names
5b9fc3d
@JelleZijlstra
Merge remote-tracking branch 'upstream/main' into codex/python315-cal…
b9e4d3e 
…endar-difflib

# Conflicts:
#	stdlib/@tests/stubtest_allowlists/py315.txt
@JelleZijlstra
JelleZijlstra marked this pull request as ready for review May 8, 2026 20:05
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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. 🤖🎉
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srittau
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 srittau May 8, 2026

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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).

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@JelleZijlstra JelleZijlstra May 8, 2026

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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.

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@JelleZijlstra
JelleZijlstra merged commit f74b24b into python:main May 8, 2026
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@JelleZijlstra
JelleZijlstra deleted the codex/python315-calendar-difflib branch May 8, 2026 20:31
@JelleZijlstra JelleZijlstra mentioned this pull request May 9, 2026
calendar: fix day_name etc. type #15738
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@srittau srittau srittau approved these changes

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@JelleZijlstra @srittau
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