DEPR: Timestamp comparison with pydate (#49394)

Author: jbrockmendel

doc/source/whatsnew/v2.0.0.rst

@@ -287,6 +287,7 @@ Removal of prior version deprecations/changes
 - Changed behavior of :class:`Index` constructor when passed a ``SparseArray`` or ``SparseDtype`` to retain that dtype instead of casting to ``numpy.ndarray`` (:issue:`43930`)
 - Removed the deprecated ``base`` and ``loffset`` arguments from :meth:`pandas.DataFrame.resample`, :meth:`pandas.Series.resample` and :class:`pandas.Grouper`. Use ``offset`` or ``origin`` instead (:issue:`31809`)
 - Changed behavior of :meth:`DataFrame.any` and :meth:`DataFrame.all` with ``bool_only=True``; object-dtype columns with all-bool values will no longer be included, manually cast to ``bool`` dtype first (:issue:`46188`)
+- Changed behavior of comparison of a :class:`Timestamp` with a ``datetime.date`` object; these now compare as un-equal and raise on inequality comparisons, matching the ``datetime.datetime`` behavior (:issue:`36131`)
 - Enforced deprecation of silently dropping columns that raised a ``TypeError`` in :class:`Series.transform` and :class:`DataFrame.transform` when used with a list or dictionary (:issue:`43740`)
 -
 

pandas/_libs/tslibs/timestamps.pyx

@@ -364,15 +364,13 @@ cdef class _Timestamp(ABCTimestamp):
             #  which incorrectly drops tz and normalizes to midnight
             #  before comparing
             # We follow the stdlib datetime behavior of never being equal
-            warnings.warn(
-                "Comparison of Timestamp with datetime.date is deprecated in "
-                "order to match the standard library behavior. "
-                "In a future version these will be considered non-comparable. "
-                "Use 'ts == pd.Timestamp(date)' or 'ts.date() == date' instead.",
-                FutureWarning,
-                stacklevel=find_stack_level(),
+            if op == Py_EQ:
+                return False
+            elif op == Py_NE:
+                return True
+            raise TypeError("Cannot compare Timestamp with datetime.date. "
+                "Use ts == pd.Timestamp(date) or ts.date() == date instead."
             )
-            return NotImplemented
         else:
             return NotImplemented
 

pandas/tests/indexing/test_loc.py

@@ -1462,9 +1462,6 @@ def test_loc_setitem_datetime_coercion(self):
         assert Timestamp("2008-08-08") == df.loc[0, "c"]
         assert Timestamp("2008-08-08") == df.loc[1, "c"]
         df.loc[2, "c"] = date(2005, 5, 5)
-        with tm.assert_produces_warning(FutureWarning):
-            # Comparing Timestamp to date obj is deprecated
-            assert Timestamp("2005-05-05") == df.loc[2, "c"]
         assert Timestamp("2005-05-05").date() == df.loc[2, "c"]
 
     @pytest.mark.parametrize("idxer", ["var", ["var"]])

pandas/tests/scalar/timestamp/test_comparisons.py

@@ -156,36 +156,22 @@ def test_compare_date(self, tz):
         # GH#36131 comparing Timestamp with date object is deprecated
         ts = Timestamp("2021-01-01 00:00:00.00000", tz=tz)
         dt = ts.to_pydatetime().date()
-        # These are incorrectly considered as equal because they
-        #  dispatch to the date comparisons which truncates ts
+        # in 2.0 we disallow comparing pydate objects with Timestamps,
+        #  following the stdlib datetime behavior.
 
+        msg = "Cannot compare Timestamp with datetime.date"
         for left, right in [(ts, dt), (dt, ts)]:
-            with tm.assert_produces_warning(FutureWarning):
-                assert left == right
-            with tm.assert_produces_warning(FutureWarning):
-                assert not left != right
-            with tm.assert_produces_warning(FutureWarning):
-                assert not left < right
-            with tm.assert_produces_warning(FutureWarning):
-                assert left <= right
-            with tm.assert_produces_warning(FutureWarning):
-                assert not left > right
-            with tm.assert_produces_warning(FutureWarning):
-                assert left >= right
-
-        # Once the deprecation is enforced, the following assertions
-        #  can be enabled:
-        #    assert not left == right
-        #    assert left != right
-        #
-        #    with pytest.raises(TypeError):
-        #        left < right
-        #    with pytest.raises(TypeError):
-        #        left <= right
-        #    with pytest.raises(TypeError):
-        #        left > right
-        #    with pytest.raises(TypeError):
-        #        left >= right
+            assert not left == right
+            assert left != right
+
+            with pytest.raises(TypeError, match=msg):
+                left < right
+            with pytest.raises(TypeError, match=msg):
+                left <= right
+            with pytest.raises(TypeError, match=msg):
+                left > right
+            with pytest.raises(TypeError, match=msg):
+                left >= right
 
     def test_cant_compare_tz_naive_w_aware(self, utc_fixture):
         # see GH#1404