Backport PR #36303 on branch 1.1.x (REGR: Fix IntegerArray unary ops regression)

doc/source/whatsnew/v1.1.3.rst

@@ -14,6 +14,7 @@ including other versions of pandas.
 
 Fixed regressions
 ~~~~~~~~~~~~~~~~~
+- Fixed regression in :class:`IntegerArray` unary plus and minus operations raising a ``TypeError`` (:issue:`36063`)
 - Fixed regression in :meth:`Series.__getitem__` incorrectly raising when the input was a tuple (:issue:`35534`)
 - Fixed regression in :meth:`Series.__getitem__` incorrectly raising when the input was a frozenset (:issue:`35747`)
 -

pandas/conftest.py

@@ -1032,6 +1032,19 @@ def any_nullable_int_dtype(request):
     return request.param
 
 
+@pytest.fixture(params=tm.SIGNED_EA_INT_DTYPES)
+def any_signed_nullable_int_dtype(request):
+    """
+    Parameterized fixture for any signed nullable integer dtype.
+
+    * 'Int8'
+    * 'Int16'
+    * 'Int32'
+    * 'Int64'
+    """
+    return request.param
+
+
 @pytest.fixture(params=tm.ALL_REAL_DTYPES)
 def any_real_dtype(request):
     """

pandas/core/arrays/integer.py

@@ -364,6 +364,15 @@ def __init__(self, values: np.ndarray, mask: np.ndarray, copy: bool = False):
             )
         super().__init__(values, mask, copy=copy)
 
+    def __neg__(self):
+        return type(self)(-self._data, self._mask)
+
+    def __pos__(self):
+        return self
+
+    def __abs__(self):
+        return type(self)(np.abs(self._data), self._mask)
+
     @classmethod
     def _from_sequence(cls, scalars, dtype=None, copy: bool = False) -> "IntegerArray":
         return integer_array(scalars, dtype=dtype, copy=copy)

pandas/core/generic.py

@@ -1310,7 +1310,10 @@ def __pos__(self):
         ):
             arr = operator.pos(values)
         else:
-            raise TypeError(f"Unary plus expects numeric dtype, not {values.dtype}")
+            raise TypeError(
+                "Unary plus expects bool, numeric, timedelta, "
+                f"or object dtype, not {values.dtype}"
+            )
         return self.__array_wrap__(arr)
 
     def __invert__(self):

pandas/tests/arrays/integer/test_arithmetic.py

@@ -261,3 +261,41 @@ def test_reduce_to_float(op):
         index=pd.Index(["a", "b"], name="A"),
     )
     tm.assert_frame_equal(result, expected)
+
+
+@pytest.mark.parametrize(
+    "source, target",
+    [
+        ([1, 2, 3], [-1, -2, -3]),
+        ([1, 2, None], [-1, -2, None]),
+        ([-1, 0, 1], [1, 0, -1]),
+    ],
+)
+def test_unary_minus_nullable_int(any_signed_nullable_int_dtype, source, target):
+    dtype = any_signed_nullable_int_dtype
+    arr = pd.array(source, dtype=dtype)
+    result = -arr
+    expected = pd.array(target, dtype=dtype)
+    tm.assert_extension_array_equal(result, expected)
+
+
+@pytest.mark.parametrize(
+    "source", [[1, 2, 3], [1, 2, None], [-1, 0, 1]],
+)
+def test_unary_plus_nullable_int(any_signed_nullable_int_dtype, source):
+    dtype = any_signed_nullable_int_dtype
+    expected = pd.array(source, dtype=dtype)
+    result = +expected
+    tm.assert_extension_array_equal(result, expected)
+
+
+@pytest.mark.parametrize(
+    "source, target",
+    [([1, 2, 3], [1, 2, 3]), ([1, -2, None], [1, 2, None]), ([-1, 0, 1], [1, 0, 1])],
+)
+def test_abs_nullable_int(any_signed_nullable_int_dtype, source, target):
+    dtype = any_signed_nullable_int_dtype
+    s = pd.array(source, dtype=dtype)
+    result = abs(s)
+    expected = pd.array(target, dtype=dtype)
+    tm.assert_extension_array_equal(result, expected)

pandas/tests/frame/test_operators.py

@@ -119,7 +119,7 @@ def test_pos_object(self, df):
         "df", [pd.DataFrame({"a": pd.to_datetime(["2017-01-22", "1970-01-01"])})]
     )
     def test_pos_raises(self, df):
-        msg = re.escape("Unary plus expects numeric dtype, not datetime64[ns]")
+        msg = "Unary plus expects .* dtype, not datetime64\\[ns\\]"
         with pytest.raises(TypeError, match=msg):
             (+df)
         with pytest.raises(TypeError, match=msg):

pandas/tests/series/test_operators.py

@@ -536,3 +536,44 @@ def test_invert(self):
         ser = tm.makeStringSeries()
         ser.name = "series"
         tm.assert_series_equal(-(ser < 0), ~(ser < 0))
+
+    @pytest.mark.parametrize(
+        "source, target",
+        [
+            ([1, 2, 3], [-1, -2, -3]),
+            ([1, 2, None], [-1, -2, None]),
+            ([-1, 0, 1], [1, 0, -1]),
+        ],
+    )
+    def test_unary_minus_nullable_int(
+        self, any_signed_nullable_int_dtype, source, target
+    ):
+        dtype = any_signed_nullable_int_dtype
+        s = pd.Series(source, dtype=dtype)
+        result = -s
+        expected = pd.Series(target, dtype=dtype)
+        tm.assert_series_equal(result, expected)
+
+    @pytest.mark.parametrize(
+        "source", [[1, 2, 3], [1, 2, None], [-1, 0, 1]],
+    )
+    def test_unary_plus_nullable_int(self, any_signed_nullable_int_dtype, source):
+        dtype = any_signed_nullable_int_dtype
+        expected = pd.Series(source, dtype=dtype)
+        result = +expected
+        tm.assert_series_equal(result, expected)
+
+    @pytest.mark.parametrize(
+        "source, target",
+        [
+            ([1, 2, 3], [1, 2, 3]),
+            ([1, -2, None], [1, 2, None]),
+            ([-1, 0, 1], [1, 0, 1]),
+        ],
+    )
+    def test_abs_nullable_int(self, any_signed_nullable_int_dtype, source, target):
+        dtype = any_signed_nullable_int_dtype
+        s = pd.Series(source, dtype=dtype)
+        result = abs(s)
+        expected = pd.Series(target, dtype=dtype)
+        tm.assert_series_equal(result, expected)