Sync histograms with the updated tutorial

[realpython-bot]

Companion code sync for the maintenance update of Python Histogram Plotting: NumPy, Matplotlib, pandas & Seaborn.

• Article draft (admin): https://realpython.com/pbjt/blog/post/2405/change/
• Maintenance card: https://trello.com/c/DqfFjckm

What changed

• seaborn.distplot() is gone. It is removed in seaborn v0.14, so the two calls move to the supported API: sns.histplot(d, kde=True) for the KDE figure, and an explicit stats.laplace.fit() plus a histplot(..., stat="density") overlay for the distribution-fitting figure (histplot() has no fit= argument). The warnings.catch_warnings() wrapper existed only to silence a distplot()/normed warning, so it and the now-unused warnings import are dropped.
• NumPy 2 scalars. max(a) becomes np.max(a), and the reproduced collections.Counter dict calls .tolist() on both sides so it prints {0: 1, 1: 3, ...} instead of {np.int64(0): np.int64(1), ...} — matching the article's output block.
• New histograms/requirements.txt, pinned to the same versions as the article's dependencies field (plus scipy, which the script imports).

Verification

• Fresh venv on Python 3.14 from the new requirements.txt; MPLBACKEND=Agg python histograms.py runs to completion (exit 0), every assert passes, and the printed value_counts() / pd.cut() tables match the article's updated output blocks byte for byte.
• uvx ruff@0.14.1 format --check histograms -> 1 file already formatted.
• uvx ruff@0.14.1 check histograms -> All checks passed!

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