Web Reference: Feb 4, 2026 · In this guide, we’ll dive deep into how to use setup.py (Python’s traditional packaging script) to define optional dependencies, best practices for naming and structuring extras, common pitfalls to avoid, and real-world examples to illustrate the concepts. Jun 9, 2025 · One feature of this language is the ability to specify extras, which are optional components of a distribution that, when used, install additional dependencies. This PEP proposes a mechanism to allow one or more extras to be installed by default if none are provided explicitly. Mar 29, 2017 · You aren't really free to include both the required and optional dependencies in a requirements file because 'pip install' will immediately abort if any of the packages in the file fail to install. It seems that using two separate requirements files is the only correct solution.
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