pandas Series doesn't take a MultiIndex for the index argument

[Dr-Irv]

Environment data

• Language Server version: 2020.9.5
• OS and version: Windows 10
• Python version (& distribution if applicable, e.g. Anaconda): Anaconda python 3.7.5

Expected behaviour

No error

Actual behaviour

mi2: pd.MultiIndex = pd.MultiIndex.from_product([[1, 2], [3, 4]], names=["a", "b"])
print(mi2)
s = pd.Series([1, 2, 3, 4], index=mi2)
print(s)

This gives error message:

Argument of type "MultiIndex" cannot be assigned to parameter "index" of type "str | int | Series[Unknown] | List[Unknown]" in function "__init__"
  Type "MultiIndex" cannot be assigned to type "str | int | Series[Unknown] | List[Unknown]"
    "MultiIndex" is incompatible with "str"
    "MultiIndex" is incompatible with "int"
    "MultiIndex" is incompatible with "Series[Unknown]"
    "MultiIndex" is incompatible with "List[Unknown]"

This change seems to fix it:

diff series.pyi.ORIG series.pyi
11a12
> from pandas.core.indexes.api import MultiIndex
56c57
<         index: Union[_str, int, Series, List] = ...,
---
>         index: Union[_str, int, Series, List, MultiIndex] = ...,

[jakebailey]

This issue has been fixed in version 2020.9.6, which we've just released. You can find the changelog here: https://github.com/microsoft/pylance-release/blob/master/CHANGELOG.md#202096-23-september-2020