# RC Review of the MIL-001 Python files

## Metadata
| Key | Value |
| --- | --- |
| ID | RC-008 |
| CrossReference | [PY-MIL-001], [QC-PY-001] |

## Version History
| Date | Status | Author | Reviewer | Change | Commit |
| --- | --- | --- | --- | --- | --- |
| 2026-10-13 | Accepted | Jens Tirsvad Nielsen | AI as stand-in for S01 | Initial version | pending |

---

## Artifact Under Review

- Instance reviewed: [PY-MIL-001]
- Checklist used: [QC-PY-001]
- Scope: full review of src/squirrel/__init__.py, src/squirrel/constants.py, tests/test_constants.py
- Language and domain: n/a
- Language reviewer: none (the stand-in reviewer reads English and the `it` domain)
- Mode: autonomous, not independent (reviewer: AI as stand-in for S01)

## Checklist Results

| # | Criterion | Status | Evidence/Notes |
| --- | --- | --- | --- |
| 1 | Packages, modules, functions, variables, classes and constants follow PEP 8 casing (`snake_case`, `PascalCase`, `UPPER_SNAKE`) (Mandatory) | Pass | Module constants are UPPER_SNAKE; test functions snake_case; package `squirrel`. |
| 2 | Names state purpose in the domain's language; no unexplained abbreviations, no single-letter names outside tiny scopes (Mandatory) | Pass | Names state purpose (FUR_COLOR_COLUMN, DEFAULT_OUTPUT_PATH). |
| 3 | Code is produced by the project's formatter and passes its linter with no unexplained suppressions (Mandatory) | Pass | `ruff format --check` and `ruff check` (0.17.0, rules E, F, I, UP, B, D) pass with no suppressions. |
| 4 | Every function and method signature is type-annotated, including `-> None` (Mandatory) | Pass | Every test function is annotated `-> None`; constants carry annotations; `mypy --strict` passes. |
| 5 | No bare `except:`, no swallowed exceptions; specific exceptions are raised and the cause is kept (`raise ... from`) (Mandatory) | Pass | No exception handling in this module. |
| 6 | No mutable default arguments and no shadowed builtins (Mandatory) | Pass | No functions with defaults; no builtins shadowed. |
| 7 | Files, locks and connections are managed with context managers (Mandatory) | Pass | Test reads the source with `pathlib.Path.read_text`, which closes the file. |
| 8 | Public modules, classes and functions have docstrings that say what, not how (Optional) | Pass | Module and constants have Doxygen `##` blocks and a module docstring. |
| 9 | Logging uses `logging`, not `print`; no secrets or personal data in log output (Mandatory) | Pass | No `print` and no logging; no secrets. |
| 10 | Classes and operations trace to the Design Class Diagram they implement; deviations are recorded (Mandatory) | N-A | No classes or operations exist; no DCD yet. |
| 11 | Tests exist for new behaviour, are named for the behaviour, and do not depend on order or the network (Mandatory) | Pass | 6 tests in `tests/test_constants.py` named for behaviour; no order or network dependence. |
| 12 | Type checker runs in strict mode without errors; `Any` is justified in a comment (Optional) | Pass | `mypy 2.4.0 --strict`: success, no issues in 3 source files. |
| 13 | Dependencies are declared and pinned in the project's dependency file, none unused (Optional) | Pass | No runtime dependencies; dev tools pinned exactly in `pyproject.toml`. |
| 14 | Each piece of knowledge (a business rule, constant, format, validation or query) is defined in one place; code is merged only where it expresses the same knowledge, not where it merely looks alike (Mandatory) | Pass | Each literal is defined once in `constants.py`. |
| 15 | Imports point inward: business-rule modules import no framework, database, UI or delivery-mechanism code, and there are no import cycles (Mandatory) | Pass | Only `pathlib` is imported; no framework code. |
| 16 | SOLID holds: a class or module has one reason to change; new behaviour is added by extension, not by editing a type test in several places; subclasses honour the contract of their base; protocols are narrow; high-level code depends on protocols or abstract types and receives its implementations (Mandatory) | Pass | A data module with no types or branching; nothing to violate. |

## Overall Verdict

Go — all Mandatory criteria pass; criterion 10 is not applicable because no class exists.

## Action Items

| Action | Owner | Due |
| --- | --- | --- |
| None | S01 | - |

---

[PY-MIL-001]: ../../../src/squirrel/constants.py
[QC-PY-001]: ../../../framework/qc/code/qc-programming-python.md