Method __getitem__

xarray/core/accessor_str.py:293–300

(
        self,
        key: int | slice,
    )

        return self._apply(func=len, dtype=int)

    def __getitem__(
        self,
        key: int | slice,
    ) -> T_DataArray:
        if isinstance(key, slice):
            return self.slice(start=key.start, stop=key.stop, step=key.step)
        else:
            return self.get(key)

    def __add__(self, other: Any) -> T_DataArray:
        return self.cat(other, sep="")