pandas `Styler` has no `.columns` attr defined

[thatlittleboy]

Describe the bug

pandas Styler has no .columns attr defined in the stubs.

To Reproduce

1. Minimal example, save in a file named t.py

from typing import reveal_type
import pandas as pd
from pandas.io.formats import style as pd_style


def f(s: pd_style.Styler) -> pd_style.Styler:
    print(s.columns)
    fmt = "{:.2%}"
    return s.format(fmt)


df = pd.DataFrame({"a": [1, 2, 3]})
df2 = df.style.pipe(f)
reveal_type(df2)

2. Run with mypy mypy t.py
3. error message

t.py:7: error: "Styler" has no attribute "columns"  [attr-defined]
t.py:14: note: Revealed type is "pandas.io.formats.style.Styler"
Found 1 error in 1 file (checked 1 source file)

Please complete the following information:

• OS: MacOS
• OS Version Sonoma 14.4.1
• python version 3.12
• version of type checker mypy 1.14.1 (compiled: yes)
• version of installed pandas-stubs 2.2.3.241126

Additional context

the StyleRenderer base class has columns defined in __init__.

https://github.com/pandas-dev/pandas/blob/8973c551895c2cd3619cadf554362e802b27e02a/pandas/io/formats/style_render.py#L100

[Dr-Irv]

Issue here is that Styler.columns is not documented in pandas, and the stubs only supports what is documented.

I've created pandas-dev/pandas#60815 . Once that is resolved, then a PR is welcome to fix this here.

[Dr-Irv]

I've created pandas-dev/pandas#60815 . Once that is resolved, then a PR is welcome to fix this here.

This is now fixed in pandas, so PR with test welcome.

[Rishab260]

take

[Rishab260]

Hi @Dr-Irv , could you please specify the actionable items for this?

[Dr-Irv]

Hi @Dr-Irv , could you please specify the actionable items for this?

You'd have to add index and columns as properties in the stubs for Styler in /io/formats/style.pyi and then add tests in tests/test_styler.py

[Rishab260]

Hi @Dr-Irv , could you please specify the actionable items for this?

You'd have to add index and columns as properties in the stubs for Styler in /io/formats/style.pyi and then add tests in tests/test_styler.py

Got it, thanks @Dr-Irv