Modernize a measurement report

This repository contains a working laboratory report utility written in a manual style. Refactor it using the modern Python features introduced in Sec. 6 while preserving its behavior.

Set up and establish the baseline

Create or activate an environment and install the development tools:

python -m pip install -r requirements-dev.txt
python -m pytest
python -m ruff format --check .
python -m ruff check .

The tests and formatting check initially pass. Ruff linting reports issues to address during the refactor. Read measurement_report.py and its tests before changing either file.

Checkpoint 1: make the record explicit

Replace the manually implemented Measurement class with:

@dataclass(frozen=True, slots=True)
class Measurement:
    sample_id: str
    value: float
    unit: str

The public constructor and attributes must remain the same. Add tests showing:

• records with equal fields compare equal;
• records with at least one different field compare unequal;
• fields cannot be reassigned.

Use normal pytest discovery conventions, but choose descriptive test names of your own.

Checkpoint 2: use Path objects

Change report_path to accept and return Path objects:

def report_path(output_dir: Path, sample_id: str) -> Path:

Join path components with / instead of string concatenation. Update the tests and callers to construct paths with Path.

Checkpoint 3: simplify report writing

Use an f-string in render_report while preserving this exact output:

Sample A5: 21.35 C

Change save_report to accept a Path, create missing parent directories, and open the file with a context manager and UTF-8 encoding:

def save_report(path: Path, report: str) -> None:

Use pytest's tmp_path fixture when testing file output. Tests must not write into the repository or depend on the process's working directory.

Checkpoint 4: complete the docstrings

Add a Google-style Returns: section to each function that returns a value, including report_path and render_report. Ruff checks these sections using pydoclint. save_report returns None and does not need one.

Verify and submit

Run all checks and inspect the refactor:

python -m pytest
python -m ruff format --check .
python -m ruff check .
git diff
git status

Commit and submit the result:

git add measurement_report.py tests/test_measurement_report.py
git commit -m "Modernize measurement reporting"
gh student submit