PeriodIndex element start_time and end_time attributes raise error

[eito-fis]

Describe the bug
Accessing start_time or end_time on a PeriodIndex raises a Member <> is unknown error.

To Reproduce
Code:

import pandas as pd
index = pd.period_range(start = "2000", end="2023", freq="y")
index[0].start_time

Error:

/home/l05/code/opensource/reproduce/pandas_start_end_time.py
  /home/l05/code/opensource/reproduce/pandas_start_end_time.py:4:10 - error: Cannot access member "start_time" for type "str"
    Member "start_time" is unknown (reportGeneralTypeIssues)
  /home/l05/code/opensource/reproduce/pandas_start_end_time.py:4:10 - error: Cannot access member "start_time" for type "bytes"
    Member "start_time" is unknown (reportGeneralTypeIssues)
  /home/l05/code/opensource/reproduce/pandas_start_end_time.py:4:10 - error: Cannot access member "start_time" for type "date"
    Member "start_time" is unknown (reportGeneralTypeIssues)
  /home/l05/code/opensource/reproduce/pandas_start_end_time.py:4:10 - error: Cannot access member "start_time" for type "datetime"
    Member "start_time" is unknown (reportGeneralTypeIssues)
  /home/l05/code/opensource/reproduce/pandas_start_end_time.py:4:10 - error: Cannot access member "start_time" for type "timedelta"
    Member "start_time" is unknown (reportGeneralTypeIssues)
  /home/l05/code/opensource/reproduce/pandas_start_end_time.py:4:10 - error: Cannot access member "start_time" for type "bool"
    Member "start_time" is unknown (reportGeneralTypeIssues)
  /home/l05/code/opensource/reproduce/pandas_start_end_time.py:4:10 - error: Cannot access member "start_time" for type "int"
    Member "start_time" is unknown (reportGeneralTypeIssues)
  /home/l05/code/opensource/reproduce/pandas_start_end_time.py:4:10 - error: Cannot access member "start_time" for type "float"
    Member "start_time" is unknown (reportGeneralTypeIssues)
  /home/l05/code/opensource/reproduce/pandas_start_end_time.py:4:10 - error: Cannot access member "start_time" for type "Timestamp"
    Member "start_time" is unknown (reportGeneralTypeIssues)
  /home/l05/code/opensource/reproduce/pandas_start_end_time.py:4:10 - error: Cannot access member "start_time" for type "Timedelta"
    Member "start_time" is unknown (reportGeneralTypeIssues)
  /home/l05/code/opensource/reproduce/pandas_start_end_time.py:4:10 - error: Cannot access member "start_time" for type "complex"
    Member "start_time" is unknown (reportGeneralTypeIssues)

Please complete the following information:

• OS: Ubuntu 20.04
• python version: 3.10.7
• version of type checker: pyright 1.1.293
• version of installed pandas-stubs: 1.5.3.230203

Additional context
Would this be as simple as updating the IndexIterScaler type? I would be happy to open a PR.

[Dr-Irv]

Thanks for this report. There are a few issues here

We need to define __getitem__() in core/indexes/period.pyi as follows:

    def __getitem__(self, idx: int ) -> Period: ...

But we also need to fix __getitem__() in core/indexes/base.py and change

pandas-stubs/pandas-stubs/core/indexes/base.pyi

Line 197 in c5d9c08

def __getitem__(self, idx: int | tuple[np_ndarray_anyint, ...]) -> Scalar: ...

to not have the tuple argument.

We also need to look at the other subclasses of Index in core/indexes and add appropriate __getitem__() definitions so that the right type is returned. This might be better done with a new mixin class that is generic and returns the appropriate type, and just had __getitem__() defined.

Also, need to add appropriate tests for doing a __getitem__() on each of those different subclasses.