Merge remote-tracking branch 'upstream/main' into more-dedup-1

Author: dangotbanned

narwhals/utils.py

@@ -63,7 +63,6 @@
     from narwhals.typing import DataFrameLike
     from narwhals.typing import DTypes
     from narwhals.typing import IntoSeriesT
-    from narwhals.typing import NativeFrame
     from narwhals.typing import SizeUnit
     from narwhals.typing import SupportsNativeNamespace
     from narwhals.typing import TimeUnit
@@ -108,6 +107,10 @@ class _FullContext(_StoresImplementation, _LimitedContext, Protocol):  # noqa: P
         - `_version`
         """
 
+    class _StoresColumns(Protocol):
+        @property
+        def columns(self) -> Sequence[str]: ...
+
 
 class Version(Enum):
     V1 = auto()
@@ -1349,10 +1352,8 @@ def dtype_matches_time_unit_and_time_zone(
     )
 
 
-def get_column_names(
-    df: NativeFrame | CompliantDataFrame[Any] | CompliantLazyFrame,
-) -> Sequence[str]:
-    return df.columns
+def get_column_names(frame: _StoresColumns, /) -> Sequence[str]:
+    return frame.columns
 
 
 def _hasattr_static(obj: Any, attr: str) -> bool: