I had it in my backlog to ask about making _get_shared_lib_location public, so thanks for bringing this up 😄

For plugins, the other thing I'd love would be a public parse_into_expr function - currently I've put this one in the cookiecutter, which only uses public methods, but it would be nice to just do

from polars.plugin_utils import (
    get_shared_lib_location,
    parse_into_expr,
)

https://github.com/MarcoGorelli/cookiecutter-polars-plugins/blob/6071d14e88deebea4c73cbbb8d63b7d09d9f1da1/%7B%7B%20cookiecutter.project_slug%20%7D%7D/%7B%7B%20cookiecutter.project_slug%20%7D%7D/utils.py#L11-L48

Having said that, with this change, all plugins will break, even though authors just followed official guidance. I'd really appreciate it if

from polars.utils.udfs import _get_shared_lib_location

could keep working for now, but just emit a deprecation warning, advising to use whatever the replacement path is. Given that polars.api already has register_expr_namespace, maybe that would be a good place for this to live as well?

Codecov Report

Attention: Patch coverage is 93.44262% with 36 lines in your changes are missing coverage. Please review.

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@@            Coverage Diff             @@
##             main   #14772      +/-   ##
==========================================
- Coverage   80.94%   80.93%   -0.01%     
==========================================
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==========================================
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Having said that, with this change, all plugins will break, even though authors just followed official guidance.

All right, will keep that unchanged in this PR. Can follow up with a PR to add a polars.plugins module with some of the relevant utils.

awesome, thanks! I'll repurpose #14779 as a follow-up then once this is in