Polars Enum does not work for Polars verion >=1.0.0

[butterlyn]

Describe the bug
pl.Enum does not work for Polars version >=1.0.0

• I have checked that this issue has not already been reported.
• I have confirmed this bug exists on the latest version of pandera.
• (optional) I have confirmed this bug exists on the main branch of pandera.

Note: Please read this guide detailing how to provide the necessary information for us to reproduce your bug.

Code Sample, a copy-pastable example

import pandera.polars as pa
import polars as pl

yes_no_enum_dtype = pl.Enum(categories=["yes", "no"])

class MyDataFrameModel(pa.DataFrameModel):
    answer: yes_no_enum_dtype

df: pl.DataFrame = pl.DataFrame(data={"answer": ["yes", "no", "no"]}, schema={"answer": yes_no_enum_dtype})

MyDataFrameModel.validate(df)

TypeError: cannot parse input of type 'Enum' into Polars data type: Enum(categories=['yes', 'no'])

Note that this only happens when Polars version is >=1.0.0, and runs without error if polars verion is <1.0.0 (tested on 0.20.31)

Desktop (please complete the following information):

• OS: Windows

Screenshots

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Additional context

I suspect the cause of the issue is that the annotation is not recognized as a Polars dtype here:

pandera/pandera/api/polars/model.py

Line 52 in 97221a6

is_polars_dtype = inspect.isclass(

Though this doesn't explain why the error only occurs for Polars version >=1.0.0.

import inspect
import polars as pl

yes_no_enum_dtype = pl.Enum(categories=["yes", "no"])

print(inspect.isclass(yes_no_enum_dtype))

False

Also, this issue similar to #1767, but that issue is a feature request, while this issue is about a bug triggered by Polars 1.0.0 for an existing Pandera feature.

edit: clarify that this was done with Pandera version v0.20.3

[butterlyn]

Ran this on the main branch, the error message changes (compared to v0.20.3) to:

ImportError: cannot import name 'Check' from partially initialized module 'pandera.api.checks' (most likely due to a circular import) (C:\Users\nbutterly\Documents\Coding_2\pandera_testing\pandera\pandera\api\checks.py)