from __future__ import annotations from typing import TYPE_CHECKING, Any, NoReturn from narwhals._interchange.dataframe import map_interchange_dtype_to_narwhals_dtype from narwhals._utils import Version if TYPE_CHECKING: from typing_extensions import Self from narwhals.dtypes import DType class InterchangeSeries: _version = Version.V1 def __init__(self, df: Any) -> None: self._native_series = df def __narwhals_series__(self) -> Self: return self def __native_namespace__(self) -> NoReturn: msg = ( "Cannot access native namespace for interchange-level 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) -> DType: return map_interchange_dtype_to_narwhals_dtype(self._native_series.dtype) @property def native(self) -> Any: return self._native_series def __getattr__(self, attr: str) -> NoReturn: msg = ( # pragma: no cover f"Attribute {attr} is not supported for interchange-level 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)