[Bug] `DataFrame.set_index` does not accept `pd.Index` anymore.

[alkatar21]

Describe the bug
DataFrame.set_index does not accept pd.Index anymore.

To Reproduce

# pyright: strict, reportUnknownMemberType=false
"""Example."""
import pandas as pd

df = pd.DataFrame()
expected = df.set_index(pd.Index([])) # Argument of type "Index" cannot be assigned to parameter "keys" of type "Label | Sequence[Unknown]" in function "set_index"

Please complete the following information:

• OS: Linux
• OS Version: 20.04
• python version: 3.8.10
• version of type checker: pylance v2022.7.31 (not in v2022.7.30)
• version of installed pandas-stubs: i belive _stub_version = Literal["1.4.3.220710"] (pylane bundled)

Additional context
Add any other context about the problem here.

[Dr-Irv]

Thanks for the report. Docs say:

This parameter can be either a single column key, a single array of the same length as the calling DataFrame, or a list containing an arbitrary combination of column keys and arrays. Here, “array” encompasses Series, Index, np.ndarray, and instances of Iterator.

So we need to update the parameters in frame.pyi and add tests in test_frame.py

PR welcome!

[twoertwein]

This is probably a result of Index no longer being declared as Hashable.

[Dr-Irv]

This is probably a result of Index no longer being declared as Hashable.

Good find. We should probably be explicit in saying that Series, Index, np.ndarray and Iterator[Hashable] are valid (and remove Sequence)