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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
26 lines
774 B
Markdown
26 lines
774 B
Markdown
# Demo app: `tasks`
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A deliberately tiny command-line task tracker. It exists to be *changed by an AI*, so it's small
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enough to read in a minute but real enough to have more than one file, which is exactly where the
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copy-paste workflow starts to hurt.
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This is the running example for **Module 1** (where you feel the copy-paste problem) and **Module 2**
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(where you put it under version control).
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## Files
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- `tasks.py`: the core logic (`Task`, `TaskList`).
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- `cli.py`: the command-line front end. Reads/writes `tasks.json`.
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## Run it
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```bash
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python3 cli.py add "read module 1"
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python3 cli.py add "set up my editor"
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python3 cli.py list
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python3 cli.py done 0
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python3 cli.py list
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```
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Requires Python 3.10+ (it uses `list[Task]` style type hints). No third-party packages.
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