018-hirst-painting/docs/sqa/reviews/rc-005-code-mil-001.md

Review Record: Code of MIL-001 (Colour Palette)

Metadata

Key	Value
ID	RC-005
CrossReference	MIL-001, BC-001, QC-PY-001

Version History

Date	Status	Author	Reviewer	Change	Commit
2026-10-07	Accepted	Jens Tirsvad Nielsen	S01	Initial version (draft prepared by the assistant for S01 to confirm) Verdict Go confirmed by S01	b7119ef

---

Artifact Under Review

• Instance reviewed: the code of MIL-001 tasks 2, 3 and 5 (issues #2, #3 and #5): src/hirst_painting.py (is_white_shade, remove_white_shades, extract_palette), tests/test_hirst_painting.py (18 tests), and the tool configuration in pyproject.toml
• Checklist used: QC-PY-001
• Scope: full review
• Language and domain: n/a (source code is a technical type, always IT Professional English)
• Language reviewer: none. S01 is also the author of record; S01 accepted a documented self-review on 2026-10-07 (see the review record of BC-001, Action Item 1)

Status of this record: final. The assistant read the code against every criterion and ran the checks named below; S01 confirmed the verdict Go on 2026-10-07.

Evidence gathered on 2026-10-07 with Python 3.13.14, ruff 0.16.10, mypy 2.4.0 and pytest 9.1.1:

• ruff format --check . reports no changes and ruff check . reports "All checks passed!"
• mypy (strict, set in pyproject.toml) reports "no issues found in 2 source files"
• pytest reports 18 passed; the same 18 pass in reverse order and each passes when run alone
• A search of src/ and tests/ for print(, logging, except, noqa, type: ignore and nosec finds nothing
• An abstract-syntax-tree scan of both files finds no shadowed builtin

Checklist Results

#	Criterion	Status	Evidence/Notes
1	Packages, modules, functions, variables, classes and constants follow PEP 8 casing (snake_case, PascalCase, UPPER_SNAKE)	Pass	Module hirst_painting; functions is_white_shade, remove_white_shades, extract_palette; constants WHITE_THRESHOLD, EXTRACTED_COLOUR_COUNT, REFERENCE_IMAGE_PATH, STRIPE_WIDTH; type alias Colour; private test helper _write_stripes; ruff rule set N (pep8-naming) is on and clean
2	Names state purpose in the domain's language; no unexplained abbreviations, no single-letter names outside tiny scopes	Pass	Names follow the PO terms of BC-001 (colour, palette, white shade). No single-letter names; rgb.r, rgb.g and rgb.b are the colorgram library's own attribute names. The code spells "colour" as the documents do, while library calls keep their own spelling
3	Code is produced by the project's formatter and passes its linter with no unexplained suppressions	Pass	Both commands above are clean. There is no inline suppression. The only configured exemption is D103 for tests/*, and pyproject.toml explains it (test names state the behaviour)
4	Every function and method signature is type-annotated, including -> None	Pass	Every function in src/ and tests/, including each test and the helper, is annotated; the ANN rules and mypy --strict enforce it
5	No bare except:, no swallowed exceptions; specific exceptions are raised and the cause is kept (raise ... from)	Pass	The code has no try or except. A missing image raises FileNotFoundError from the library and propagates; test_extract_palette_raises_when_image_is_missing proves it. The code raises no exception of its own, so no raise ... from is needed
6	No mutable default arguments and no shadowed builtins	Pass	The only default argument is the integer constant EXTRACTED_COLOUR_COUNT; the syntax-tree scan finds no shadowed builtin
7	Files, locks and connections are managed with context managers	N-A	The code opens no file itself: colorgram opens the image from its path. After extract_palette the file can be deleted on Windows, which shows that no handle stays open
8	Public modules, classes and functions have docstrings that say what, not how	Pass	Module docstring and a docstring on each public function; extract_palette also states its FileNotFoundError. ruff rules D (pydocstyle, PEP 257) are on and clean
9	Logging uses logging, not print; no secrets or personal data in log output	Pass	src/ has no print, no logging and no secrets. The program does not read .env
10	Classes and operations trace to the Design Class Diagram they implement; deviations are recorded	N-A	No Design Class Diagram exists: design artifacts are out of scope in BC-001 and the code has no classes. The functions trace to tasks 2, 3 and 5 of MIL-001 instead
11	Tests exist for new behaviour, are named for the behaviour, and do not depend on order or the network	Pass	18 tests named test_<behaviour>_<condition>; they use tmp_path and the repository's own image, and need no network. Order independence was run, not assumed (reverse order and each test alone). Review found one test name that said "at most" while asserting an exact count; it was renamed to test_extract_palette_returns_requested_count_when_image_has_more_colours before this record
12	Type checker runs in strict mode without errors; Any is justified in a comment	Pass	mypy strict is clean. colorgram ships no type information, so pyproject.toml sets ignore_missing_imports for that one module with a comment saying so; its values are converted to Colour at the boundary in extract_palette
13	Dependencies are declared and pinned in the project's dependency file, none unused	Pass	pyproject.toml pins colorgram.py==1.2.0 and, in the dev group, mypy==2.4.0, pillow==12.3.0, pytest==9.1.1 and ruff==0.16.10. Each is used: pillow by the tests, the others by the code and tools. There is no lock file; the pins are in pyproject.toml

Overall Verdict

Go — confirmed by S01 on 2026-10-07. All 11 applicable criteria of QC-PY-001 pass, including the 3 optional ones (8, 12, 13); criteria 7 and 10 are N-A with the reasons above. The one defect found in review (a misleading test name) was fixed before the record. A Go here is Go criterion 5 of MIL-001, the last open one.

Action Items

#	Action	Owner	Due
1	Confirm the verdict Go for the code of MIL-001, or name the criterion you disagree with. Closed 2026-10-07: S01 confirmed Go	S01	2026-10-09

---