Add GitHub Actions workflow for Python package

[AKB0700]

This workflow installs Python dependencies, runs tests, and lints code with multiple Python versions.

[Copilot]

Pull request overview

Adds a new GitHub Actions workflow intended to run linting and tests for the Python package across multiple Python versions on pushes and pull requests to main.

Changes:

• Introduces .github/workflows/python-package.yml with a Python version matrix (3.9–3.11).
• Adds steps to install dependencies, run flake8, and run pytest.

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[Copilot]

Lint command runs flake8 ., which will lint everything in the repo (including examples/, docs, etc.) and may diverge from existing CI behavior. The established workflow (.github/workflows/run_ci.yml) runs poetry run flake8 deepl tests; consider matching that scope here to avoid unexpected failures/noise.

Suggested change

	flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
	# exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
	flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
	flake8 deepl tests --count --select=E9,F63,F7,F82 --show-source --statistics
	# exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
	flake8 deepl tests --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics

[Copilot]

This workflow triggers on the same events/branches as the existing .github/workflows/run_ci.yml workflow, so it will run in parallel and potentially duplicate work/CI time. Consider consolidating these checks into the existing workflow (e.g., add a pytest job there) or adjust triggers/job naming so responsibilities are clearly separated.

Suggested change

	push:
	branches: [ "main" ]
	pull_request:
	branches: [ "main" ]
	pull_request:
	branches: [ "main" ]
	workflow_dispatch:

[Copilot]

steps: list items are not indented under steps: (the - uses: lines are at the same indentation level). This makes the workflow YAML invalid and GitHub Actions will fail to parse it. Indent the step entries so they are children of steps:.

Suggested change

	- uses: actions/checkout@v4
	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v3
	with:
	python-version: ${{ matrix.python-version }}
	- name: Install dependencies
	run: |
	python -m pip install --upgrade pip
	python -m pip install flake8 pytest
	if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
	- name: Lint with flake8
	run: |
	# stop the build if there are Python syntax errors or undefined names
	flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
	# exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
	flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
	- name: Test with pytest
	run: |
	pytest
	- uses: actions/checkout@v4
	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v3
	with:
	python-version: ${{ matrix.python-version }}
	- name: Install dependencies
	run: |
	python -m pip install --upgrade pip
	python -m pip install flake8 pytest
	if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
	- name: Lint with flake8
	run: |
	# stop the build if there are Python syntax errors or undefined names
	flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
	# exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
	flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
	- name: Test with pytest
	run: |
	pytest

[Copilot]

Dependency installation is effectively a no-op for this repo: it only installs flake8/pytest and then conditionally installs requirements.txt, but this repository uses pyproject.toml/poetry.lock (and has no requirements.txt). As a result, imports like requests won’t be installed and the pytest step is likely to fail. Consider installing via Poetry (consistent with .github/workflows/run_ci.yml) or otherwise installing the package + locked dependencies before lint/test.

Suggested change

	python -m pip install flake8 pytest
	if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
	python -m pip install poetry
	poetry config virtualenvs.create false
	poetry install --no-interaction --no-root
	python -m pip install flake8 pytest

[Copilot]

This uses actions/setup-python@v3, which is quite old and may rely on deprecated Node runtimes in GitHub Actions. Update to a currently supported major version (e.g., @v5) to avoid workflow breakage as GitHub deprecates older Node versions.

Suggested change

	uses: actions/setup-python@v3
	uses: actions/setup-python@v5