BUG: Fix ndarray + DataFrame ops (pandas-dev#23114)

Author: jbrockmendel

doc/source/whatsnew/v0.24.0.txt

@@ -845,7 +845,7 @@ Numeric
 - Bug in :class:`DataFrame` multiplication between boolean dtype and integer returning ``object`` dtype instead of integer dtype (:issue:`22047`, :issue:`22163`)
 - Bug in :meth:`DataFrame.apply` where, when supplied with a string argument and additional positional or keyword arguments (e.g. ``df.apply('sum', min_count=1)``), a ``TypeError`` was wrongly raised (:issue:`22376`)
 - Bug in :meth:`DataFrame.astype` to extension dtype may raise ``AttributeError`` (:issue:`22578`)
-
+- Bug in :class:`DataFrame` with ``timedelta64[ns]`` dtype arithmetic operations with ``ndarray`` with integer dtype incorrectly treating the narray as ``timedelta64[ns]`` dtype (:issue:`23114`)
 
 Strings
 ^^^^^^^

pandas/core/generic.py

@@ -1795,6 +1795,10 @@ def __round__(self, decimals=0):
     # ----------------------------------------------------------------------
     # Array Interface
 
+    # This is also set in IndexOpsMixin
+    # GH#23114 Ensure ndarray.__op__(DataFrame) returns NotImplemented
+    __array_priority__ = 1000
+
     def __array__(self, dtype=None):
         return com.values_from_object(self)
 

pandas/tests/arithmetic/test_numeric.py

@@ -156,7 +156,7 @@ def test_numeric_arr_rdiv_tdscalar(self, three_days, numeric_idx, box):
         if box is not pd.Index and broken:
             # np.timedelta64(3, 'D') / 2 == np.timedelta64(1, 'D')
             raise pytest.xfail("timedelta64 not converted to nanos; "
-                               "Tick division not imlpemented")
+                               "Tick division not implemented")
 
         expected = TimedeltaIndex(['3 Days', '36 Hours'])
 

pandas/tests/arithmetic/test_object.py

@@ -140,9 +140,6 @@ def test_objarr_radd_str_invalid(self, dtype, data, box):
                                     operator.sub, ops.rsub])
     def test_objarr_add_invalid(self, op, box):
         # invalid ops
-        if box is pd.DataFrame and op is ops.radd:
-            pytest.xfail(reason="DataFrame op incorrectly casts the np.array"
-                                "case to M8[ns]")
 
         obj_ser = tm.makeObjectSeries()
         obj_ser.name = 'objects'

pandas/tests/arithmetic/test_timedelta64.py

@@ -364,13 +364,13 @@ def test_td64arr_add_str_invalid(self, box):
                                     operator.sub, ops.rsub],
                              ids=lambda x: x.__name__)
     def test_td64arr_add_sub_float(self, box, op, other):
+        if box is pd.DataFrame and isinstance(other, np.ndarray):
+            pytest.xfail("Tries to broadcast, raising "
+                         "ValueError instead of TypeError")
+
         tdi = TimedeltaIndex(['-1 days', '-1 days'])
         tdi = tm.box_expected(tdi, box)
 
-        if box is pd.DataFrame and op in [operator.add, operator.sub]:
-            pytest.xfail(reason="Tries to align incorrectly, "
-                                "raises ValueError")
-
         with pytest.raises(TypeError):
             op(tdi, other)
 
@@ -1126,9 +1126,6 @@ def test_td64arr_floordiv_tdscalar(self, box, scalar_td):
 
     def test_td64arr_rfloordiv_tdscalar(self, box, scalar_td):
         # GH#18831
-        if box is pd.DataFrame and isinstance(scalar_td, np.timedelta64):
-            pytest.xfail(reason="raises TypeError, not sure why")
-
         td1 = Series([timedelta(minutes=5, seconds=3)] * 3)
         td1.iloc[2] = np.nan
 

pandas/tests/frame/test_analytics.py

@@ -2046,8 +2046,11 @@ def test_matmul(self):
 
         # np.array @ DataFrame
         result = operator.matmul(a.values, b)
+        assert isinstance(result, DataFrame)
+        assert result.columns.equals(b.columns)
+        assert result.index.equals(pd.Index(range(3)))
         expected = np.dot(a.values, b.values)
-        tm.assert_almost_equal(result, expected)
+        tm.assert_almost_equal(result.values, expected)
 
         # nested list @ DataFrame (__rmatmul__)
         result = operator.matmul(a.values.tolist(), b)