from __future__ import annotations from typing import TYPE_CHECKING from typing import Any from typing import NoReturn from narwhals._interchange.dataframe import map_interchange_dtype_to_narwhals_dtype if TYPE_CHECKING: from typing_extensions import Self from narwhals.dtypes import DType from narwhals.utils import Version class InterchangeSeries: def __init__(self: Self, df: Any, version: Version) -> None: self._native_series = df self._version = version def __narwhals_series__(self: Self) -> Self: return self def __native_namespace__(self: Self) -> NoReturn: msg = ( "Cannot access native namespace for metadata-only series with unknown backend. " "If you would like to see this kind of object supported in Narwhals, please " "open a feature request at https://github.com/narwhals-dev/narwhals/issues." ) raise NotImplementedError(msg) @property def dtype(self: Self) -> DType: return map_interchange_dtype_to_narwhals_dtype( self._native_series.dtype, version=self._version ) @property def native(self) -> Any: return self._native_series def __getattr__(self: Self, attr: str) -> NoReturn: msg = ( # pragma: no cover f"Attribute {attr} is not supported for metadata-only dataframes.\n\n" "Hint: you probably called `nw.from_native` on an object which isn't fully " "supported by Narwhals, yet implements `__dataframe__`. If you would like to " "see this kind of object supported in Narwhals, please open a feature request " "at https://github.com/narwhals-dev/narwhals/issues." ) raise NotImplementedError(msg)