list[str] type broken

[janrito]

Describe the bug
A fix for #1342 , might have broken support for list[str] dtype

• 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 master branch of pandera.

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Code Sample, a copy-pastable example

import pandas as pd
import pandera as pa
from pandera.typing import DataFrame, Index, Series

class DFModel(pa.DataFrameModel):
    idx: Index[int]
    col_float: Series[float] = pa.Field(coerce=True, nullable=True)
    col_str: Series[str] = pa.Field(coerce=True, nullable=True)
    col_lst: Series[list[str]] = pa.Field(coerce=True, nullable=True)


df = (
    pd.DataFrame(
        [
            {"idx": 1, "col_float": 1.0, "col_str": "one", "col_lst": ["one"]},
            {"idx": 2, "col_float": None, "col_str": None, "col_lst": []},
            {"idx": 3, "col_float": None, "col_str": None, "col_lst": None},
        ]
    )
    .convert_dtypes(infer_objects=False, dtype_backend="numpy_nullable")
    .pipe(DataFrame[DFModel])
)
...
python3.10/site-packages/pandas/core/dtypes/common.py:1636, in pandas_dtype(dtype)
   1631     with warnings.catch_warnings():
   1632         # GH#51523 - Series.astype(np.integer) doesn't show
   1633         # numpy deprecation warning of np.integer
   1634         # Hence enabling DeprecationWarning
   1635         warnings.simplefilter("always", DeprecationWarning)
-> 1636         npdtype = np.dtype(dtype)
   1637 except SyntaxError as err:
   1638     # np.dtype uses `eval` which can raise SyntaxError
   1639     raise TypeError(f"data type '{dtype}' not understood") from err

TypeError: Cannot interpret 'list[str]' as a data type

Expected behavior

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[cosmicBboy]

I encountered this error as well when creating the PR, have you tried this on the latest main branch yet? Which version are you using?

[janrito]

Ah, i assumed the version released yesterday included this fix.

[janrito]

I just tested this. It works fine on main, soz!