fix: Use stable narwhals imports

narwhals-dev/narwhals#1426, #3693 (comment)

altair/datasets/_cache.py

@@ -5,8 +5,8 @@
 from typing import TYPE_CHECKING, ClassVar, Generic, TypeVar, get_args
 
 import narwhals.stable.v1 as nw
-from narwhals.dependencies import get_pyarrow
-from narwhals.typing import IntoDataFrameT, IntoFrameT
+from narwhals.stable.v1 import dependencies as nw_dep
+from narwhals.stable.v1.typing import IntoDataFrameT, IntoFrameT
 
 from altair.datasets._typing import VERSION_LATEST
 
@@ -151,7 +151,9 @@ def clear(self) -> None:
             .get_column("sha_suffix")
         )
         names = set[str](
-            ser.to_list() if nw.get_native_namespace(ser) is get_pyarrow() else ser
+            ser.to_list()
+            if nw.get_native_namespace(ser) is nw_dep.get_pyarrow()
+            else ser
         )
         for fp in self:
             if fp.name in names:

altair/datasets/_loader.py

@@ -2,7 +2,7 @@
 
 from typing import TYPE_CHECKING, Generic, final, overload
 
-from narwhals.typing import IntoDataFrameT, IntoFrameT
+from narwhals.stable.v1.typing import IntoDataFrameT, IntoFrameT
 
 from altair.datasets._readers import _Reader, backend
 

altair/datasets/_readers.py

@@ -30,7 +30,7 @@
 )
 
 import narwhals.stable.v1 as nw
-from narwhals.typing import IntoDataFrameT, IntoExpr, IntoFrameT
+from narwhals.stable.v1.typing import IntoDataFrameT, IntoExpr, IntoFrameT
 
 from altair.datasets._cache import DatasetCache
 from altair.datasets._typing import EXTENSION_SUFFIXES, is_ext_read

tests/test_datasets.py

@@ -12,13 +12,8 @@
 from urllib.error import URLError
 
 import pytest
-from narwhals.dependencies import (
-    is_into_dataframe,
-    is_pandas_dataframe,
-    is_polars_dataframe,
-    is_pyarrow_table,
-)
 from narwhals.stable import v1 as nw
+from narwhals.stable.v1 import dependencies as nw_dep
 
 from altair.datasets import Loader, url
 from altair.datasets._readers import _METADATA, AltairDatasetsError
@@ -227,11 +222,11 @@ def test_load_call(monkeypatch: pytest.MonkeyPatch) -> None:
     default_2 = load("cars")
     df_polars = load("cars", backend="polars")
 
-    assert is_polars_dataframe(default)
-    assert is_pyarrow_table(df_pyarrow)
-    assert is_pandas_dataframe(df_pandas)
-    assert is_polars_dataframe(default_2)
-    assert is_polars_dataframe(df_polars)
+    assert nw_dep.is_polars_dataframe(default)
+    assert nw_dep.is_pyarrow_table(df_pyarrow)
+    assert nw_dep.is_pandas_dataframe(df_pandas)
+    assert nw_dep.is_polars_dataframe(default_2)
+    assert nw_dep.is_polars_dataframe(df_polars)
 
 
 @pytest.mark.parametrize(
@@ -320,7 +315,7 @@ def test_loader_call(backend: _Backend, monkeypatch: pytest.MonkeyPatch) -> None
 
     data = Loader.from_backend(backend)
     frame = data("stocks", ".csv")
-    assert is_into_dataframe(frame)
+    assert nw_dep.is_into_dataframe(frame)
     nw_frame = nw.from_native(frame)
     assert set(nw_frame.columns) == {"symbol", "date", "price"}
 
@@ -493,7 +488,7 @@ def test_reader_cache(
     cached_paths = tuple(data.cache)
     assert len(cached_paths) == 4
 
-    if is_polars_dataframe(lookup_groups):
+    if nw_dep.is_polars_dataframe(lookup_groups):
         left, right = (
             lookup_groups,
             cast(pl.DataFrame, data("lookup_groups", tag="v2.5.3")),
@@ -664,7 +659,7 @@ def test_all_datasets(
 ) -> None:
     """Ensure all annotated datasets can be loaded with the most reliable backend."""
     frame = polars_loader(name, suffix, tag=tag)
-    assert is_polars_dataframe(frame)
+    assert nw_dep.is_polars_dataframe(frame)
 
 
 def _raise_exception(e: type[Exception], *args: Any, **kwds: Any):
@@ -698,7 +693,7 @@ def test_no_remote_connection(monkeypatch: pytest.MonkeyPatch, tmp_path: Path) -
 
     # Now we can get a cache-hit
     frame = data("birdstrikes")
-    assert is_polars_dataframe(frame)
+    assert nw_dep.is_polars_dataframe(frame)
     assert len(tuple(tmp_path.iterdir())) == 4
 
     with monkeypatch.context() as mp: