Method _iset_item_mgr

pandas/core/frame.py:4838–4846

(
        self,
        loc: int | slice | np.ndarray,
        value,
        inplace: bool = False,
        refs: BlockValuesRefs | None = None,
    )

        self[key] = value[value.columns[0]]

    def _iset_item_mgr(
        self,
        loc: int | slice | np.ndarray,
        value,
        inplace: bool = False,
        refs: BlockValuesRefs | None = None,
    ) -> None:
        # when called from _set_item_mgr loc can be anything returned from get_loc
        self._mgr.iset(loc, value, inplace=inplace, refs=refs)

    def _set_item_mgr(
        self, key, value: ArrayLike, refs: BlockValuesRefs | None = None