Dataframes: Permit installation of pandas v3.0

[amotl]

About

Make examples ready for pandas 3, released on Jan 21, 2026.

References

• Update pandas requirement from ==2.3.* to ==3.0.* in /by-dataframe/pandas #1362
• Update pandas requirement from <3 to <4 in /by-dataframe/dask #1377

[coderabbitai]

Walkthrough

This PR updates time frequency specifications from "S" to "s" in dataframe creation functions and adjusts pandas version constraints in requirement files across both Dask and Pandas implementations.

Changes

Cohort / File(s)	Summary
Frequency Parameter Updates by-dataframe/dask/insert_dask.py, by-dataframe/pandas/insert_pandas.py	Updated time frequency argument in makeTimeDataFrame from "S" (uppercase) to "s" (lowercase).
Pandas Version Constraints by-dataframe/dask/requirements.txt, by-dataframe/pandas/requirements.txt	Tightened and broadened pandas version constraints; Dask now pins <3.1 while Pandas shifted from exact (==2.3.\*) to range (>=2.3,<3.1).

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 From S to s, the seconds now flow,
Frequency whispers in lowercase glow,
Pandas versions expand with a bound,
Compatible updates all around!

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 50.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the main change: permitting pandas v3.0 installation by updating version constraints in requirements files and code.
Description check	✅ Passed	The description is related to the changeset, explaining that the PR makes examples ready for pandas 3 released on Jan 21, 2026, with relevant issue references.

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch pandas3

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No actionable comments were generated in the recent review. 🎉

🧹 Recent nitpick comments

by-dataframe/dask/requirements.txt (1)

5-5: Consider adding a lower bound for pandas.

The pandas requirements file uses pandas>=2.3,<3.1, but here only an upper bound is specified. This is likely fine since dask[dataframe]>=2024.4.1 transitively constrains the pandas lower bound, but adding >=2.3 would make the constraint explicit and consistent across both example projects.

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