Add custom name setter and getter for proxy objects in cudf.pandas (r…

…apidsai#16234)

Closes rapidsai#14524

Authors:
  - Matthew Murray (https://github.com/Matt711)

Approvers:
  - Bradley Dice (https://github.com/bdice)

URL: rapidsai#16234

python/cudf/cudf/pandas/_wrappers/pandas.py

@@ -260,6 +260,23 @@ def Index__new__(cls, *args, **kwargs):
     return self
 
 
+def name(self):
+    return self._fsproxy_wrapped._name
+
+
+def Index__setattr__(self, name, value):
+    if name.startswith("_"):
+        object.__setattr__(self, name, value)
+        return
+    if name == "name":
+        setattr(self._fsproxy_wrapped, "_name", value)
+    if name == "names":
+        setattr(self._fsproxy_wrapped, "_names", value)
+    return _FastSlowAttribute("__setattr__").__get__(self, type(self))(
+        name, value
+    )
+
+
 Index = make_final_proxy_type(
     "Index",
     cudf.Index,
@@ -277,11 +294,13 @@ def Index__new__(cls, *args, **kwargs):
         "__iter__": custom_iter,
         "__init__": _DELETE,
         "__new__": Index__new__,
+        "__setattr__": Index__setattr__,
         "_constructor": _FastSlowAttribute("_constructor"),
         "__array_ufunc__": _FastSlowAttribute("__array_ufunc__"),
         "_accessors": set(),
         "_data": _FastSlowAttribute("_data", private=True),
         "_mask": _FastSlowAttribute("_mask", private=True),
+        "name": property(name),
     },
 )
 
@@ -292,7 +311,11 @@ def Index__new__(cls, *args, **kwargs):
     fast_to_slow=lambda fast: fast.to_pandas(),
     slow_to_fast=cudf.from_pandas,
     bases=(Index,),
-    additional_attributes={"__init__": _DELETE},
+    additional_attributes={
+        "__init__": _DELETE,
+        "__setattr__": Index__setattr__,
+        "name": property(name),
+    },
 )
 
 SparseDtype = make_final_proxy_type(
@@ -319,7 +342,11 @@ def Index__new__(cls, *args, **kwargs):
     fast_to_slow=lambda fast: fast.to_pandas(),
     slow_to_fast=cudf.from_pandas,
     bases=(Index,),
-    additional_attributes={"__init__": _DELETE},
+    additional_attributes={
+        "__init__": _DELETE,
+        "__setattr__": Index__setattr__,
+        "name": property(name),
+    },
 )
 
 Categorical = make_final_proxy_type(
@@ -350,6 +377,8 @@ def Index__new__(cls, *args, **kwargs):
         "__init__": _DELETE,
         "_data": _FastSlowAttribute("_data", private=True),
         "_mask": _FastSlowAttribute("_mask", private=True),
+        "__setattr__": Index__setattr__,
+        "name": property(name),
     },
 )
 
@@ -385,6 +414,8 @@ def Index__new__(cls, *args, **kwargs):
         "__init__": _DELETE,
         "_data": _FastSlowAttribute("_data", private=True),
         "_mask": _FastSlowAttribute("_mask", private=True),
+        "__setattr__": Index__setattr__,
+        "name": property(name),
     },
 )
 
@@ -441,6 +472,8 @@ def Index__new__(cls, *args, **kwargs):
         "__init__": _DELETE,
         "_data": _FastSlowAttribute("_data", private=True),
         "_mask": _FastSlowAttribute("_mask", private=True),
+        "__setattr__": Index__setattr__,
+        "name": property(name),
     },
 )
 
@@ -474,14 +507,23 @@ def Index__new__(cls, *args, **kwargs):
     additional_attributes={"__hash__": _FastSlowAttribute("__hash__")},
 )
 
+
+def names(self):
+    return self._fsproxy_wrapped._names
+
+
 MultiIndex = make_final_proxy_type(
     "MultiIndex",
     cudf.MultiIndex,
     pd.MultiIndex,
     fast_to_slow=lambda fast: fast.to_pandas(),
     slow_to_fast=cudf.from_pandas,
     bases=(Index,),
-    additional_attributes={"__init__": _DELETE},
+    additional_attributes={
+        "__init__": _DELETE,
+        "__setattr__": Index__setattr__,
+        "name": property(names),
+    },
 )
 
 TimeGrouper = make_intermediate_proxy_type(
@@ -669,6 +711,8 @@ def Index__new__(cls, *args, **kwargs):
         "__init__": _DELETE,
         "_data": _FastSlowAttribute("_data", private=True),
         "_mask": _FastSlowAttribute("_mask", private=True),
+        "__setattr__": Index__setattr__,
+        "name": property(name),
     },
 )
 

python/cudf/cudf_pandas_tests/test_cudf_pandas.py

@@ -1592,3 +1592,43 @@ def test_at_setitem_empty():
     df.at[0, "new"] = 2.0
     expected = pd.DataFrame({"name": [1.0], "new": [2.0]})
     tm.assert_frame_equal(df, expected)
+
+
+@pytest.mark.parametrize(
+    "index",
+    [
+        xpd.Index([1, 2, 3], name="foo"),
+        xpd.Index(["a", "b", "c"], name="foo"),
+        xpd.RangeIndex(start=0, stop=3, step=1, name="foo"),
+        xpd.CategoricalIndex(["a", "b", "a"], name="foo"),
+        xpd.DatetimeIndex(
+            ["2024-04-24", "2025-04-24", "2026-04-24"], name="foo"
+        ),
+        xpd.TimedeltaIndex(["1 days", "2 days", "3 days"], name="foo"),
+        xpd.PeriodIndex(
+            ["2024-06", "2023-06", "2022-06"], freq="M", name="foo"
+        ),
+        xpd.IntervalIndex.from_breaks([0, 1, 2, 3], name="foo"),
+        xpd.MultiIndex.from_tuples(
+            [(1, "a"), (2, "b"), (3, "c")], names=["foo1", "bar1"]
+        ),
+    ],
+)
+def test_change_index_name(index):
+    s = xpd.Series([1, 2, object()], index=index)
+    df = xpd.DataFrame({"values": [1, 2, object()]}, index=index)
+
+    if isinstance(index, xpd.MultiIndex):
+        names = ["foo2", "bar2"]
+        s.index.names = names
+        df.index.names = names
+
+        assert s.index.names == names
+        assert df.index.names == names
+    else:
+        name = "bar"
+        s.index.name = name
+        df.index.name = name
+
+        assert s.index.name == name
+        assert df.index.name == name