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Provides comprehensive guidance and implementation patterns for building distributable Python libraries and command-line tools. It covers modern packaging standards such as PEP 517 and PEP 621, helping users configure pyproject.toml files, manage dependencies, and choose appropriate build backends like setuptools or hatchling. This skill is ideal for developers looking to standardize their project structures, implement dynamic versioning, or automate their publishing workflows to PyPI using tools like Twine and GitHub Actions.