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Each lab now stands on its own; no hard dependency on prior labs. - App-based labs get a canonical tasks-app snapshot in lab/start/ (three baselines: v0 add/list/done; v1 +count; v2 +count/delete), assigned by where each module sits in the command timeline. Modules with a purpose-built app (M10 trap, M13 planted bug, M21) snapshot their own app; planted devices kept. - Self-contained labs (M15/17/18/19/22/23/24/25/27, which operate on their own lab files) get a preamble pointing at modules/NN/lab/. - Every module + capstone gets a "Starting point (skip-friendly)" preamble: copy the snapshot, git init -b main, commit -> clean status, then start. Lets a learner skip around or recover: copy start/, commit, go. All snapshots run; tools/check.sh passes; no em-dashes. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01TfzV5QvtPDz8LJS3Pu5VLT
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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 withpending_count().cli.py: command-line front end. Addscount.
Run it
python cli.py add "write the tests"
python cli.py add "fix the bug"
python cli.py done 0
python cli.py list
python cli.py count
Requires Python 3.10+. No third-party packages; tests use the standard library unittest.