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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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Demo app: `tasks` (Module 13 copy)

The same tiny task tracker from Modules 1 and 2, with one feature added: a count command backed by TaskList.pending_count(). Use this copy for the Module 13 lab so everyone starts from the same code, including the same latent bug.

If you already have a tasks-app from earlier modules, you can use that instead; just make sure it has a count command (the Module 2 lab added one). The planted bug in this copy is there on purpose.

Files

tasks.py: core logic (Task, TaskList), now with pending_count().
cli.py: command-line front end. Adds count.

Run it

python3 cli.py add "write the tests"
python3 cli.py add "fix the bug"
python3 cli.py done 0
python3 cli.py list
python3 cli.py count

Requires Python 3.10+. No third-party packages; tests use the standard library unittest.

861 B Raw Blame History

Demo app: tasks (Module 13 copy)

Files

Run it

861 B

Raw Blame History

Demo app: `tasks` (Module 13 copy)