chore: Transition selectors away from Protocol38

narwhals/_arrow/namespace.py

@@ -236,7 +236,7 @@ def concat(
 
     @property
     def selectors(self: Self) -> ArrowSelectorNamespace:
-        return ArrowSelectorNamespace(self)
+        return ArrowSelectorNamespace.from_namespace(self)
 
     def when(self: Self, predicate: ArrowExpr) -> ArrowWhen:
         return ArrowWhen.from_expr(predicate, context=self)

narwhals/_arrow/selectors.py

@@ -7,40 +7,18 @@
 from narwhals._compliant import EagerSelectorNamespace
 
 if TYPE_CHECKING:
-    from typing_extensions import Self
-
-    from narwhals._arrow.dataframe import ArrowDataFrame
-    from narwhals._arrow.series import ArrowSeries
-    from narwhals._compliant import EvalNames
-    from narwhals._compliant import EvalSeries
-    from narwhals.utils import _FullContext
+    from narwhals._arrow.dataframe import ArrowDataFrame  # noqa: F401
+    from narwhals._arrow.series import ArrowSeries  # noqa: F401
 
 
 class ArrowSelectorNamespace(EagerSelectorNamespace["ArrowDataFrame", "ArrowSeries"]):
-    def _selector(
-        self,
-        call: EvalSeries[ArrowDataFrame, ArrowSeries],
-        evaluate_output_names: EvalNames[ArrowDataFrame],
-        /,
-    ) -> ArrowSelector:
-        return ArrowSelector(
-            call,
-            depth=0,
-            function_name="selector",
-            evaluate_output_names=evaluate_output_names,
-            alias_output_names=None,
-            backend_version=self._backend_version,
-            version=self._version,
-        )
-
-    def __init__(self: Self, context: _FullContext, /) -> None:
-        self._implementation = context._implementation
-        self._backend_version = context._backend_version
-        self._version = context._version
+    @property
+    def _selector(self) -> type[ArrowSelector]:
+        return ArrowSelector
 
 
 class ArrowSelector(CompliantSelector["ArrowDataFrame", "ArrowSeries"], ArrowExpr):  # type: ignore[misc]
-    def _to_expr(self: Self) -> ArrowExpr:
+    def _to_expr(self) -> ArrowExpr:
         return ArrowExpr(
             self._call,
             depth=self._depth,

narwhals/_compliant/__init__.py

@@ -15,8 +15,6 @@
 from narwhals._compliant.selectors import CompliantSelector
 from narwhals._compliant.selectors import CompliantSelectorNamespace
 from narwhals._compliant.selectors import EagerSelectorNamespace
-from narwhals._compliant.selectors import EvalNames
-from narwhals._compliant.selectors import EvalSeries
 from narwhals._compliant.selectors import LazySelectorNamespace
 from narwhals._compliant.series import CompliantSeries
 from narwhals._compliant.series import EagerSeries
@@ -26,6 +24,8 @@
 from narwhals._compliant.typing import CompliantSeriesT
 from narwhals._compliant.typing import EagerDataFrameT
 from narwhals._compliant.typing import EagerSeriesT
+from narwhals._compliant.typing import EvalNames
+from narwhals._compliant.typing import EvalSeries
 from narwhals._compliant.typing import IntoCompliantExpr
 from narwhals._compliant.typing import NativeFrameT_co
 from narwhals._compliant.typing import NativeSeriesT_co