done

lib/python3.11/site-packages/narwhals/_interchange/series.py

@@ -0,0 +1,47 @@
+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)