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Use python3 as the canonical command name course-wide (#104 )

Most current systems (default Debian/Ubuntu, recent macOS) install Python
only as `python3`, with no bare `python` on PATH, so learners who copied
`python cli.py ...` into their host shell hit "command not found".

Convert host-shell `python <cmd>` -> `python3 <cmd>` across module/lab
READMEs, lab `.py` docstrings & usage strings, blog posts, lab prompt and
instruction files, the M04 verify.sh message, and the M10/M24 lab patches.
Module 01's convention note (and its blog/02 mirror) is rewritten so
`python3` is canonical and `python` is the documented fallback.

Stop-lines respected: Docker image tags (`python:3.12-slim`), `.venv/.../python`
and `...\.venv\Scripts\python.exe` paths, the M20 `"command": "python"`
teaching example and surrounding venv prose, container-internal invocations
(M16/M18 Dockerfiles, M16 README `docker run` examples), and CI-workflow
`run:` steps fed by `actions/setup-python` / `image: python:3.12` are left
as `python` on purpose.

pip was left out of scope: most occurrences are prose or CI/container-internal,
and `pip3` does not fix the PEP 668 externally-managed-environment refusal that
the course already addresses with venvs. The M01 note is worded to stay
consistent with bare `pip` (use whichever pip pairs with your Python).

Build (tools/build_wiki.py) and tools/check.sh both pass.

Closes #104

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GAEzanEoGJT5o1VizQar47

2026-06-23 20:18:04 -04:00

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Agent prompt: issue #42, branch `feature/42-count`

Run this in the tasks-app-42-count worktree. This agent's work is genuinely parallel with #43 (docs), which touches different files, and deliberately collides with #44 (clear) at cli.py's dispatch chain.

You are working in this worktree only. Do not touch any other folder.

Task: Add a count command to cli.py that prints the number of pending (not-done) tasks.

Add a new elif command == "count": branch to the dispatch in main() in cli.py.
Use the existing TaskList.pending() method from tasks.py; do not change tasks.py.
Print just the integer, e.g. 3.

Acceptance criteria:

python3 cli.py count prints the number of pending tasks and exits 0.
No other files change. (README.md, CHANGELOG.md, and tasks.py are owned by other agents; stay out of them.)

When done, commit your work on this branch with a message referencing #42, then push the branch. Stop there; the human opens and reviews the PR.

1015 B Raw Blame History

Agent prompt: issue #42, branch feature/42-count

1015 B

Raw Blame History

Agent prompt: issue #42, branch `feature/42-count`