Method pad_or_backfill

pandas/core/internals/blocks.py:1843–1868

(
        self,
        *,
        method: FillnaOptions,
        inplace: bool = False,
        limit: int | None = None,
        limit_area: Literal["inside", "outside"] | None = None,
    )

    @final
    def pad_or_backfill(
        self,
        *,
        method: FillnaOptions,
        inplace: bool = False,
        limit: int | None = None,
        limit_area: Literal["inside", "outside"] | None = None,
    ) -> list[Block]:
        values = self.values

        kwargs: dict[str, Any] = {"method": method, "limit": limit}
        if "limit_area" in inspect.signature(values._pad_or_backfill).parameters:
            kwargs["limit_area"] = limit_area
        elif limit_area is not None:
            raise NotImplementedError(
                f"{type(values).__name__} does not implement limit_area "
                "(added in pandas 2.2). 3rd-party ExtensionArray authors "
                "need to add this argument to _pad_or_backfill."
            )

        if values.ndim == 2:
            # NDArrayBackedExtensionArray.fillna assumes axis=0
            new_values = values.T._pad_or_backfill(**kwargs).T
        else:
            new_values = values._pad_or_backfill(**kwargs)
        return [self.make_block_same_class(new_values)]


class ExtensionBlock(EABackedBlock):