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doc/python: clarify `optional-dependencies' are only for explicit dep groups (#377049)

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Some project may claim, in their README or otherwise, a particular library as
an optional dependency. But it doesn't make it one in the context of the
`optional-dependencies` derivation attribute.
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Ihar Hrachyshka 2025-04-24 16:44:27 -04:00 • committed by GitHub
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8
doc/languages-frameworks/python.section.md
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@ -2102,6 +2102,14 @@ Note this method is preferred over adding parameters to builders, as that can
result in packages depending on different variants and thereby causing
collisions.
::: {.note}
The `optional-dependencies` attribute should only be used for dependency groups
as defined in package metadata. If a package gracefully handles missing
dependencies in runtime but doesn't advertise it through package metadata, then
these dependencies should not be listed at all. (One may still have to list
them in `nativeCheckInputs` to pass test suite.)
:::
### How to contribute a Python package to nixpkgs? {#tools}
Packages inside nixpkgs must use the [`buildPythonPackage`](#buildpythonpackage-function) or [`buildPythonApplication`](#buildpythonapplication-function) function directly,