REF: implement _apply_blockwise

[jbrockmendel]

Preliminary pushing towards #34714

[jreback]

I think ultimately you want to put this _apply_blockwise in a BlockwiseMixin, similar to SelectionMixin, so you can add it to groupby and so on, but suppose could be done later

[jreback]

can you type the output

[jreback]

can you type these

[jbrockmendel]

I think ultimately you want to put this _apply_blockwise in a BlockwiseMixin, similar to SelectionMixin, so you can add it to groupby and so on, but suppose could be done later

I'm planning a BlockManager method that subsumes all of the apply-blockwise usages.

For that to work, we need to get all of the relevant looping-over-blocks functions into a form that can be passed to such a method. Thats the intermediate goal of this and #35356.

[jbrockmendel]

@simonjayhawkins is this new/expected?

pandas/core/window/rolling.py:500: error: Type variable "pandas._typing.ArrayLike" is unbound
pandas/core/window/rolling.py:500: note: (Hint: Use "Generic[ArrayLike]" or "Protocol[ArrayLike]" base class to bind "ArrayLike" inside a class)
pandas/core/window/rolling.py:500: note: (Hint: Use "ArrayLike" in function signature to bind "ArrayLike" inside a function)

[jbrockmendel]

that worked, thanks @simonjayhawkins

[jreback]

thanks