BUG: interpolate raising wrong error for ea

pandas-dev · Oct 1, 2023 · 9320144 · 9320144
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diff --git a/doc/source/whatsnew/v2.1.2.rst b/doc/source/whatsnew/v2.1.2.rst
@@ -22,6 +22,7 @@ Fixed regressions
 
 Bug fixes
 ~~~~~~~~~
+- Fixed bug in :meth:`DataFrame.interpolate` raising incorrect error message (:issue:`55347`)
 - Fixed bug in :meth:`DataFrame.resample` not respecting ``closed`` and ``label`` arguments for :class:`~pandas.tseries.offsets.BusinessDay` (:issue:`55282`)
 - Fixed bug in :meth:`DataFrame.resample` where bin edges were not correct for :class:`~pandas.tseries.offsets.BusinessDay` (:issue:`55281`)
 -

diff --git a/pandas/core/arrays/base.py b/pandas/core/arrays/base.py
@@ -891,8 +891,8 @@ def interpolate(
         limit,
         limit_direction,
         limit_area,
-        fill_value,
-        copy: bool,
+        fill_value=None,
+        copy: bool = True,
         **kwargs,
     ) -> Self:
         """

diff --git a/pandas/tests/frame/methods/test_interpolate.py b/pandas/tests/frame/methods/test_interpolate.py
@@ -497,3 +497,9 @@ def test_interpolate_empty_df(self):
         result = df.interpolate(inplace=True)
         assert result is None
         tm.assert_frame_equal(df, expected)
+
+    def test_interpolate_ea_raise(self):
+        # GH#55347
+        df = DataFrame({"a": [1, None, 2]}, dtype="Int64")
+        with pytest.raises(NotImplementedError, match="does not implement"):
+            df.interpolate()