Initial Python project structure

.gitignore

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+__pycache__/
+*.py[cod]
+*$py.class
+.env
+.venv/
+venv/
+*.egg-info/
+dist/
+build/
+.pytest_cache/
+.ruff_cache/

README.md

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+# demo-app
+
+A Python demo application.
+
+## Installation
+
+```bash
+pip install -e .
+```
+
+## Development
+
+```bash
+pip install -e ".[dev]"
+pytest
+```
+
+## Usage
+
+```bash
+python -m demo_app.main
+```

pyproject.toml

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+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"
+
+[project]
+name = "demo-app"
+version = "0.1.0"
+description = "Python demo application"
+readme = "README.md"
+requires-python = ">=3.10"
+license = "MIT"
+dependencies = []
+
+[project.optional-dependencies]
+dev = [
+    "pytest>=7.0",
+    "ruff>=0.1.0",
+]

src/demo_app/__init__.py

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+"""Demo App - A Python demo application."""
+
+__version__ = "0.1.0"

src/demo_app/main.py

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+"""Main entry point for demo-app."""
+
+
+def main() -> None:
+    """Run the demo application."""
+    print("Hello from demo-app!")
+
+
+if __name__ == "__main__":
+    main()

tests/test_main.py

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+"""Tests for main module."""
+
+from demo_app.main import main
+
+
+def test_main(capsys):
+    """Test main function output."""
+    main()
+    captured = capsys.readouterr()
+    assert "Hello from demo-app!" in captured.out