Deprecate protocol and update tests accordingly

python/cudf/cudf/core/dataframe.py

@@ -27,6 +27,7 @@
 import pandas as pd
 import pyarrow as pa
 from nvtx import annotate
+from packaging import version
 from pandas.io.formats import console
 from pandas.io.formats.printing import pprint_thing
 from typing_extensions import Self, assert_never
@@ -5562,6 +5563,12 @@ def from_pandas(cls, dataframe, nan_as_null=no_default):
         elif hasattr(dataframe, "__dataframe__"):
             # TODO: Probably should be handled in the constructor as
             # this isn't pandas specific
+            assert version.parse(cudf.__version__) < version.parse("25.04.00")
+            warnings.warn(
+                "Support for loading dataframes via the `__dataframe__` interchange "
+                "protocol is deprecated",
+                FutureWarning,
+            )
             return from_dataframe(dataframe, allow_copy=True)
         else:
             raise TypeError(
@@ -7709,6 +7716,8 @@ def pct_change(
     def __dataframe__(
         self, nan_as_null: bool = False, allow_copy: bool = True
     ):
+        assert version.parse(cudf.__version__) < version.parse("25.04.00")
+        warnings.warn("Using `__dataframe__` is deprecated", FutureWarning)
         return df_protocol.__dataframe__(
             self, nan_as_null=nan_as_null, allow_copy=allow_copy
         )

python/cudf/cudf/tests/test_df_protocol.py

@@ -1,4 +1,4 @@
-# Copyright (c) 2021-2024, NVIDIA CORPORATION.
+# Copyright (c) 2021-2025, NVIDIA CORPORATION.
 from __future__ import annotations
 
 from typing import Any
@@ -22,6 +22,10 @@
 )
 from cudf.testing import assert_eq
 
+pytestmark = pytest.mark.filterwarnings(
+    "ignore:Using `__dataframe__` is deprecated:FutureWarning"
+)
+
 
 @pytest.fixture(
     params=[