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content/blog/pyextradeps.md

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+---
+title: "Python Packaging: Optional Dependencies"
+date: 2020-05-01T00:43:07-04:00
+draft: false
+tags: ["python"]
+---
+
+It is possible to make different package group of optional dependencies for a Python package. This is useful if you want to include an extra set of dependencies for developers/maintainers of the package. [OpenAI Gym uses it](https://github.com/openai/gym/blob/67212547ac29296839434324a0d5996e48fae840/setup.py) to denote different categories of environments you can setup.
+
+```python
+from setuptools import setup, find_packages
+
+extras = {
+  'typing': ['mypy~=0.740', 'mypy-extensions~=0.4.0', 'pylint~=2.4.4'],
+  'testingdocs': ['tox~=3.14.6', 'Sphinx~=3.0.1'],
+}
+
+# Meta dependency groups.
+extras['all'] = [item for group in extras.values() for item in group]
+
+setup(name='example',
+      version='0.0.1',
+      packages=find_packages(),
+      install_requires=['Flask~=1.1.1'],
+      extras_require=extras,
+)
+```
+