Is there a way to get current assigned optional dependency in setup.py

[menogrey]

I want to add a optional dependency in setup.py, and change my package install configuration when user install with the optional dependency.

setup.py for example

# eg
if has_optional_dependency("foo"):
    add_configuration("xxx")

setup(
    extras_require={
        "foo": ["foo==1.0.0"],
    }
)

[abravalheri]

This is currently not possible.

As far as I understand there is no feature in the Core Metadata specification that allows conditionality on package info¹.

Something that you may be able to pull off is to create a setup.py file that reads from environment variables for example and conditionally produces 2 separated packages like: mypkg-base and mypkg-foo, then you could use them as (optional) dependencies for a top-level "meta-ish" package mypkg.

Footnotes

1. While conditional extras in entry-points are allowed for backwards compatibility, they are treated as legacy from pre-pip times and are basically equivalent to a no-op. ↩