Series.shift with BDay is not allowed

[loicdiridollou]

Describe the bug
A clear and concise description of what the bug is.

To Reproduce

sr = pd.Series(pd.bdate_range("2023-01-03", "2023-02-06"))
check(assert_type(sr.shift(BDay(1)), "TimestampSeries"), pd.Series, pd.Timestamp)

This will raise an issue as only DateOffset is allowed in the period parameter. The issue is that BDay does not inherit from DateOffset but directly from BaseOffset.

Is there a reason why we only allow DateOffset and not BaseOffset?

Happy to take care of the PR.

Please complete the following information:

• OS: MacOS
• OS Version 15.5
• python version 3.13
• version of type checker 1.17.0
• version of installed pandas-stubs main

[Dr-Irv]

If I do this:

import pandas as pd
from pandas.tseries.offsets import BDay
sr = pd.Series(pd.bdate_range("2023-01-03", "2023-02-06"))
sr.shift(BDay(1))

I get an exception.

So I think that the stubs are correct here. Not sure where you are seeing that BaseOffset is accepted.

[loicdiridollou]

Sorry my bad I did not try it at runtime, it was deep in our codebase, and thought that was correct but you have to pass it to freq.
Will close, sorry for creating the issue.