typerror for non numerics

Author: andrewgsavage

pandas/core/arrays/arrow/array.py

@@ -1094,6 +1094,8 @@ def round(self, decimals: int = 0, *args, **kwargs) -> Self:
         DataFrame.round : Round values of a DataFrame.
         Series.round : Round values of a Series.
         """
+        if not self.dtype._is_numeric or self.dtype._is_boolean:
+            raise TypeError("Cannot round non-numeric type.")
         return type(self)(pc.round(self._pa_array, ndigits=decimals))
 
     @doc(ExtensionArray.searchsorted)

pandas/tests/extension/base/methods.py

@@ -719,10 +719,12 @@ def test_equals_same_data_different_object(self, data):
 
     def test_round(self, data):
         if not data.dtype._is_numeric or data.dtype._is_boolean:
-            pytest.skip("Round is only valid for numeric non-boolean dtypes")
-        result = pd.Series(data).round()
-        expected = pd.Series(
-            [round(element) if pd.notna(element) else element for element in data],
-            dtype=data.dtype,
-        )
-        tm.assert_series_equal(result, expected)
+            with pytest.raises(TypeError):
+                pd.Series(data).round()
+        else:
+            result = pd.Series(data).round()
+            expected = pd.Series(
+                [round(element) if pd.notna(element) else element for element in data],
+                dtype=data.dtype,
+            )
+            tm.assert_series_equal(result, expected)

pandas/tests/extension/test_datetime.py

@@ -138,6 +138,11 @@ def check_reduce(self, ser: pd.Series, op_name: str, skipna: bool):
 
         else:
             return super().check_reduce(ser, op_name, skipna)
+        
+    @pytest.mark.skip("DatetimeArray uses a different function signature for round")
+    def test_round(self):
+        pass
+
 
 
 class Test2DCompat(base.NDArrayBacked2DTests):