Delete committed dataset orphans (Track X)

[mmcky]

Deletes six committed files that no lecture in this edition reads: pandas/data/ticker_data.csv, pandas/data/test_pwt.csv (the fourth copy left behind by the Track D repoint, found in QuantEcon/workspace-lectures#54), numbers.txt, us_cities.txt and both test_table.csv copies. This edition publishes no lecture that mentions any of them (pandas.html is 404 on its site), yet all six are served — the baked-_build behaviour QuantEcon/workspace-lectures#41 describes.

Translations sit outside the data-lectures audit's scanned set, so this is the translation half of the orphan sweep: the same files the English repo deletes in its PR of the same title, verified here file by file on 2026-09-01 — every lecture that uses these datasets reads them from QuantEcon/data-lectures, and the rest are written by the lectures themselves with %%file / %%writefile before being read. The translation sync is .md-only, so nothing will re-add them.

Published surface and settle. All six serve at 200 on quantecon.github.io/lecture-python-programming.ml/ today. This repo publishes on push to main but restores a cached _build with no prune, so they clear on the next build that follows a clean cache.

Rows for QuantEcon/workspace-lectures#40 (published URL, measured today with a 200 page control and a 404 never-existed control on the same host; expect 404 after the settle):

path	today
/_static/lecture_specific/pandas/data/ticker_data.csv	200, 35,905 B
/_static/lecture_specific/pandas/data/test_pwt.csv	200, 793 B
/_static/lecture_specific/python_advanced_features/numbers.txt	200, 16 B
/_static/lecture_specific/python_advanced_features/test_table.csv	200, 377,272 B
/_static/lecture_specific/python_foundations/test_table.csv	200, 377,272 B
/_static/lecture_specific/python_foundations/us_cities.txt	200, 169 B

Deletion-time reader sweep (2026-09-01). Authenticated tarball-and-grep pass over 407 repositories: all 283 QuantEcon org repos (70 private, 26 archived; numfocus, quantecon-book-dp and test-cli are empty and unfetchable) plus 130 forks of the six holding repos (2 returned 404 and are recorded as not-swept rather than clean). Matched by basename, not URL, with each hit's three preceding lines folded in because URLs get split across source lines. Controls fired in the same pass: a never-existing basename returned 0 hits and 0 copies, and both known readers were found — the English python_advanced_features.md exercise link to test_table.csv, and devopseng99/project.lecture-wasm's runtime fetch of intro's graph.txt. Result: no repository reads any path this PR deletes. Every other co-occurrence of these basenames is a %%file embed, prose, a .gitignore line, or review text; the pre-MyST master/source/… reads in old course repos have been dead since the MyST migration and are unaffected.

Part of the Track X orphan sweep, QuantEcon/workspace-lectures#57 (one PR per holding repo, identical titles). Source list: https://quantecon.github.io/data-lectures/audit.json orphans, 2026-08-31 run.

🤖 Generated with Claude Code

[Copilot]

Pull request overview

Removes lecture-specific static data files that are no longer referenced by any published lecture content, reducing the published surface area and preventing orphaned datasets from being served from the built site.

Changes:

• Delete unused python_foundations and python_advanced_features text fixtures from lectures/_static/lecture_specific/.
• Delete unused pandas CSV fixtures from lectures/_static/lecture_specific/pandas/data/.

Reviewed changes

Copilot reviewed 4 out of 6 changed files in this pull request and generated no comments.

File	Description
lectures/_static/lecture_specific/python_foundations/us_cities.txt	Deletes an unused city-population text fixture.
lectures/_static/lecture_specific/python_advanced_features/numbers.txt	Deletes an unused numbers text fixture.
lectures/_static/lecture_specific/pandas/data/ticker_data.csv	Deletes an unused ticker time-series CSV fixture.
lectures/_static/lecture_specific/pandas/data/test_pwt.csv	Deletes an unused PWT sample CSV fixture.

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[github-actions]

📖 HTML build - view preview (7820b62)

[mmcky]

Validation (2026-09-01, Pages preview …/lecture-python-programming.ml/pr-11/): all six deleted paths → 404 (ticker_data.csv, test_pwt.csv, numbers.txt, both test_table.csv, us_cities.txt); intro.html → 200 (28,552 B); a never-existed path → 404, so the 404s are genuine. No lecture published in this edition mentions any of the six (its pandas.html is not built). Build log: 0 warnings mentioning a deleted basename.