refactor(python): Remove re-export of data type groups

[stinodego]

Changes

• Move the data type groups to their own module.
• Remove the re-export data type groups INTEGER_DTYPES, FLOAT_DTYPES, etc. from the top-level and datatypes module
  • These are not really necessary anymore since we have selectors now (e.g. use cs.integer() instead of pl.col(pl.INTEGER_DTYPES)).
  • These were not documented in the API reference so they were not officially public, but we did reference them in a few docstrings. So I added a deprecation warning - which can't really hurt.
• Define similar groups in the test suite for parametrizing tests. The existing groups are sets and so they are not suitable for parametrizing (unpredictable ordering).
• Update references to the groups.

[codecov]

Codecov Report

Attention: Patch coverage is 92.85714% with 3 lines in your changes missing coverage. Please review.

Project coverage is 80.86%. Comparing base (235ebee) to head (e734da8).
Report is 1 commits behind head on main.

Files	Patch %	Lines
py-polars/polars/datatypes/group.py	88.46%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #17073      +/-   ##
==========================================
- Coverage   80.86%   80.86%   -0.01%     
==========================================
  Files        1455     1456       +1     
  Lines      191086   191108      +22     
  Branches     2723     2725       +2     
==========================================
+ Hits       154519   154530      +11     
- Misses      36063    36074      +11     
  Partials      504      504              

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[s-banach]

So I can still do from polars.datatypes.group import NUMERIC_DTYPES?

[stinodego]

So I can still do from polars.datatypes.group import NUMERIC_DTYPES?

You can, but don't count on it. These are not meant to be public, and in fact they never really were (not documented in the API reference).

[ion-elgreco]

Ah this breaks patito on import error :P @stinodego

[stinodego]

Ah this breaks patito on import error :P @stinodego

They were importing directly from the polars.datatypes module then? Perhaps I can also nicely deprecate that path..

As a temporary workaround, they can import from polars.datatypes.group. But really they should update their code to not rely on our data type group definition.

It's expected that some downstream packages will break on a major release. Let's hope everyone manages to upgrade quickly and their code is better for it.

[ion-elgreco]

@stinodego for now indeed it's migrated to .group, see here: JakobGM/patito#74

I understand! Just wanted to make you aware 😄