# Python pass the object — demand what you use, not an id and its container — what fires, and why

Each row is one rule: the sin's id, the symptom its detector flags, and the detector that flags it. The id is what `vendor/bin/commandments info <sin>` takes, and the detector name is what `--detector=` takes if the rule turns out to be wrong.

- **`python-computed-boolean-argument`** — a method taking only bools that every caller computes from the same object — the decision re-derived at each call site — `ComputedBooleanArgumentDetector`
- **`python-converted-argument`** — a scalar parameter its callers keep filling with the same conversion — `receipt_for(str(order.id))` call after call — because it asks for the converted form instead of the value — `ConvertedArgumentDetector`
- **`python-derived-argument`** — a call that hands over an object and a projection of it — `persist(request, request.channel_id)` — or an object in three pieces, where the function could read them itself — `DerivedArgumentDetector`
- **`python-param-resolved-from-param`** — a function that takes a container and a key and first resolves one against the other — `def rename(workflow, node_id)` doing `workflow.graph.node(node_id)` — when it only wanted what the key names — `ParamResolvedFromParamDetector`