TST: stricter monotonicity tests (#23256)

Author: topper-123

pandas/tests/indexes/multi/test_monotonic.py

@@ -9,52 +9,52 @@
 def test_is_monotonic_increasing():
     i = MultiIndex.from_product([np.arange(10),
                                  np.arange(10)], names=['one', 'two'])
-    assert i.is_monotonic
-    assert i._is_strictly_monotonic_increasing
-    assert Index(i.values).is_monotonic
-    assert i._is_strictly_monotonic_increasing
+    assert i.is_monotonic is True
+    assert i._is_strictly_monotonic_increasing is True
+    assert Index(i.values).is_monotonic is True
+    assert i._is_strictly_monotonic_increasing is True
 
     i = MultiIndex.from_product([np.arange(10, 0, -1),
                                  np.arange(10)], names=['one', 'two'])
-    assert not i.is_monotonic
-    assert not i._is_strictly_monotonic_increasing
-    assert not Index(i.values).is_monotonic
-    assert not Index(i.values)._is_strictly_monotonic_increasing
+    assert i.is_monotonic is False
+    assert i._is_strictly_monotonic_increasing is False
+    assert Index(i.values).is_monotonic is False
+    assert Index(i.values)._is_strictly_monotonic_increasing is False
 
     i = MultiIndex.from_product([np.arange(10),
                                  np.arange(10, 0, -1)],
                                 names=['one', 'two'])
-    assert not i.is_monotonic
-    assert not i._is_strictly_monotonic_increasing
-    assert not Index(i.values).is_monotonic
-    assert not Index(i.values)._is_strictly_monotonic_increasing
+    assert i.is_monotonic is False
+    assert i._is_strictly_monotonic_increasing is False
+    assert Index(i.values).is_monotonic is False
+    assert Index(i.values)._is_strictly_monotonic_increasing is False
 
     i = MultiIndex.from_product([[1.0, np.nan, 2.0], ['a', 'b', 'c']])
-    assert not i.is_monotonic
-    assert not i._is_strictly_monotonic_increasing
-    assert not Index(i.values).is_monotonic
-    assert not Index(i.values)._is_strictly_monotonic_increasing
+    assert i.is_monotonic is False
+    assert i._is_strictly_monotonic_increasing is False
+    assert Index(i.values).is_monotonic is False
+    assert Index(i.values)._is_strictly_monotonic_increasing is False
 
     # string ordering
     i = MultiIndex(levels=[['foo', 'bar', 'baz', 'qux'],
                            ['one', 'two', 'three']],
                    labels=[[0, 0, 0, 1, 1, 2, 2, 3, 3, 3],
                            [0, 1, 2, 0, 1, 1, 2, 0, 1, 2]],
                    names=['first', 'second'])
-    assert not i.is_monotonic
-    assert not Index(i.values).is_monotonic
-    assert not i._is_strictly_monotonic_increasing
-    assert not Index(i.values)._is_strictly_monotonic_increasing
+    assert i.is_monotonic is False
+    assert Index(i.values).is_monotonic is False
+    assert i._is_strictly_monotonic_increasing is False
+    assert Index(i.values)._is_strictly_monotonic_increasing is False
 
     i = MultiIndex(levels=[['bar', 'baz', 'foo', 'qux'],
                            ['mom', 'next', 'zenith']],
                    labels=[[0, 0, 0, 1, 1, 2, 2, 3, 3, 3],
                            [0, 1, 2, 0, 1, 1, 2, 0, 1, 2]],
                    names=['first', 'second'])
-    assert i.is_monotonic
-    assert Index(i.values).is_monotonic
-    assert i._is_strictly_monotonic_increasing
-    assert Index(i.values)._is_strictly_monotonic_increasing
+    assert i.is_monotonic is True
+    assert Index(i.values).is_monotonic is True
+    assert i._is_strictly_monotonic_increasing is True
+    assert Index(i.values)._is_strictly_monotonic_increasing is True
 
     # mixed levels, hits the TypeError
     i = MultiIndex(
@@ -64,67 +64,67 @@ def test_is_monotonic_increasing():
         labels=[[0, 1, 1, 2, 2, 2, 3], [4, 2, 0, 0, 1, 3, -1]],
         names=['household_id', 'asset_id'])
 
-    assert not i.is_monotonic
-    assert not i._is_strictly_monotonic_increasing
+    assert i.is_monotonic is False
+    assert i._is_strictly_monotonic_increasing is False
 
     # empty
     i = MultiIndex.from_arrays([[], []])
-    assert i.is_monotonic
-    assert Index(i.values).is_monotonic
-    assert i._is_strictly_monotonic_increasing
-    assert Index(i.values)._is_strictly_monotonic_increasing
+    assert i.is_monotonic is True
+    assert Index(i.values).is_monotonic is True
+    assert i._is_strictly_monotonic_increasing is True
+    assert Index(i.values)._is_strictly_monotonic_increasing is True
 
 
 def test_is_monotonic_decreasing():
     i = MultiIndex.from_product([np.arange(9, -1, -1),
                                  np.arange(9, -1, -1)],
                                 names=['one', 'two'])
-    assert i.is_monotonic_decreasing
-    assert i._is_strictly_monotonic_decreasing
-    assert Index(i.values).is_monotonic_decreasing
-    assert i._is_strictly_monotonic_decreasing
+    assert i.is_monotonic_decreasing is True
+    assert i._is_strictly_monotonic_decreasing is True
+    assert Index(i.values).is_monotonic_decreasing is True
+    assert i._is_strictly_monotonic_decreasing is True
 
     i = MultiIndex.from_product([np.arange(10),
                                  np.arange(10, 0, -1)],
                                 names=['one', 'two'])
-    assert not i.is_monotonic_decreasing
-    assert not i._is_strictly_monotonic_decreasing
-    assert not Index(i.values).is_monotonic_decreasing
-    assert not Index(i.values)._is_strictly_monotonic_decreasing
+    assert i.is_monotonic_decreasing is False
+    assert i._is_strictly_monotonic_decreasing is False
+    assert Index(i.values).is_monotonic_decreasing is False
+    assert Index(i.values)._is_strictly_monotonic_decreasing is False
 
     i = MultiIndex.from_product([np.arange(10, 0, -1),
                                  np.arange(10)], names=['one', 'two'])
-    assert not i.is_monotonic_decreasing
-    assert not i._is_strictly_monotonic_decreasing
-    assert not Index(i.values).is_monotonic_decreasing
-    assert not Index(i.values)._is_strictly_monotonic_decreasing
+    assert i.is_monotonic_decreasing is False
+    assert i._is_strictly_monotonic_decreasing is False
+    assert Index(i.values).is_monotonic_decreasing is False
+    assert Index(i.values)._is_strictly_monotonic_decreasing is False
 
     i = MultiIndex.from_product([[2.0, np.nan, 1.0], ['c', 'b', 'a']])
-    assert not i.is_monotonic_decreasing
-    assert not i._is_strictly_monotonic_decreasing
-    assert not Index(i.values).is_monotonic_decreasing
-    assert not Index(i.values)._is_strictly_monotonic_decreasing
+    assert i.is_monotonic_decreasing is False
+    assert i._is_strictly_monotonic_decreasing is False
+    assert Index(i.values).is_monotonic_decreasing is False
+    assert Index(i.values)._is_strictly_monotonic_decreasing is False
 
     # string ordering
     i = MultiIndex(levels=[['qux', 'foo', 'baz', 'bar'],
                            ['three', 'two', 'one']],
                    labels=[[0, 0, 0, 1, 1, 2, 2, 3, 3, 3],
                            [0, 1, 2, 0, 1, 1, 2, 0, 1, 2]],
                    names=['first', 'second'])
-    assert not i.is_monotonic_decreasing
-    assert not Index(i.values).is_monotonic_decreasing
-    assert not i._is_strictly_monotonic_decreasing
-    assert not Index(i.values)._is_strictly_monotonic_decreasing
+    assert i.is_monotonic_decreasing is False
+    assert Index(i.values).is_monotonic_decreasing is False
+    assert i._is_strictly_monotonic_decreasing is False
+    assert Index(i.values)._is_strictly_monotonic_decreasing is False
 
     i = MultiIndex(levels=[['qux', 'foo', 'baz', 'bar'],
                            ['zenith', 'next', 'mom']],
                    labels=[[0, 0, 0, 1, 1, 2, 2, 3, 3, 3],
                            [0, 1, 2, 0, 1, 1, 2, 0, 1, 2]],
                    names=['first', 'second'])
-    assert i.is_monotonic_decreasing
-    assert Index(i.values).is_monotonic_decreasing
-    assert i._is_strictly_monotonic_decreasing
-    assert Index(i.values)._is_strictly_monotonic_decreasing
+    assert i.is_monotonic_decreasing is True
+    assert Index(i.values).is_monotonic_decreasing is True
+    assert i._is_strictly_monotonic_decreasing is True
+    assert Index(i.values)._is_strictly_monotonic_decreasing is True
 
     # mixed levels, hits the TypeError
     i = MultiIndex(
@@ -134,29 +134,29 @@ def test_is_monotonic_decreasing():
         labels=[[0, 1, 1, 2, 2, 2, 3], [4, 2, 0, 0, 1, 3, -1]],
         names=['household_id', 'asset_id'])
 
-    assert not i.is_monotonic_decreasing
-    assert not i._is_strictly_monotonic_decreasing
+    assert i.is_monotonic_decreasing is False
+    assert i._is_strictly_monotonic_decreasing is False
 
     # empty
     i = MultiIndex.from_arrays([[], []])
-    assert i.is_monotonic_decreasing
-    assert Index(i.values).is_monotonic_decreasing
-    assert i._is_strictly_monotonic_decreasing
-    assert Index(i.values)._is_strictly_monotonic_decreasing
+    assert i.is_monotonic_decreasing is True
+    assert Index(i.values).is_monotonic_decreasing is True
+    assert i._is_strictly_monotonic_decreasing is True
+    assert Index(i.values)._is_strictly_monotonic_decreasing is True
 
 
 def test_is_strictly_monotonic_increasing():
     idx = pd.MultiIndex(levels=[['bar', 'baz'], ['mom', 'next']],
                         labels=[[0, 0, 1, 1], [0, 0, 0, 1]])
-    assert idx.is_monotonic_increasing
-    assert not idx._is_strictly_monotonic_increasing
+    assert idx.is_monotonic_increasing is True
+    assert idx._is_strictly_monotonic_increasing is False
 
 
 def test_is_strictly_monotonic_decreasing():
     idx = pd.MultiIndex(levels=[['baz', 'bar'], ['next', 'mom']],
                         labels=[[0, 0, 1, 1], [0, 0, 0, 1]])
-    assert idx.is_monotonic_decreasing
-    assert not idx._is_strictly_monotonic_decreasing
+    assert idx.is_monotonic_decreasing is True
+    assert idx._is_strictly_monotonic_decreasing is False
 
 
 def test_searchsorted_monotonic(indices):

pandas/tests/indexes/period/test_indexing.py

@@ -404,11 +404,11 @@ def test_is_monotonic_increasing(self):
         idx_dec1 = pd.PeriodIndex([p2, p1, p1])
         idx = pd.PeriodIndex([p1, p2, p0])
 
-        assert idx_inc0.is_monotonic_increasing
-        assert idx_inc1.is_monotonic_increasing
-        assert not idx_dec0.is_monotonic_increasing
-        assert not idx_dec1.is_monotonic_increasing
-        assert not idx.is_monotonic_increasing
+        assert idx_inc0.is_monotonic_increasing is True
+        assert idx_inc1.is_monotonic_increasing is True
+        assert idx_dec0.is_monotonic_increasing is False
+        assert idx_dec1.is_monotonic_increasing is False
+        assert idx.is_monotonic_increasing is False
 
     def test_is_monotonic_decreasing(self):
         # GH 17717
@@ -422,11 +422,11 @@ def test_is_monotonic_decreasing(self):
         idx_dec1 = pd.PeriodIndex([p2, p1, p1])
         idx = pd.PeriodIndex([p1, p2, p0])
 
-        assert not idx_inc0.is_monotonic_decreasing
-        assert not idx_inc1.is_monotonic_decreasing
-        assert idx_dec0.is_monotonic_decreasing
-        assert idx_dec1.is_monotonic_decreasing
-        assert not idx.is_monotonic_decreasing
+        assert idx_inc0.is_monotonic_decreasing is False
+        assert idx_inc1.is_monotonic_decreasing is False
+        assert idx_dec0.is_monotonic_decreasing is True
+        assert idx_dec1.is_monotonic_decreasing is True
+        assert idx.is_monotonic_decreasing is False
 
     def test_is_unique(self):
         # GH 17717
@@ -435,10 +435,10 @@ def test_is_unique(self):
         p2 = pd.Period('2017-09-03')
 
         idx0 = pd.PeriodIndex([p0, p1, p2])
-        assert idx0.is_unique
+        assert idx0.is_unique is True
 
         idx1 = pd.PeriodIndex([p1, p1, p2])
-        assert not idx1.is_unique
+        assert idx1.is_unique is False
 
     def test_contains(self):
         # GH 17717

pandas/tests/indexes/test_base.py

@@ -2427,10 +2427,10 @@ def test_repeat(self):
         pd.to_datetime(['2000-01-01', 'NaT', '2000-01-02']),
         pd.to_timedelta(['1 day', 'NaT'])])
     def test_is_monotonic_na(self, index):
-        assert not index.is_monotonic_increasing
-        assert not index.is_monotonic_decreasing
-        assert not index._is_strictly_monotonic_increasing
-        assert not index._is_strictly_monotonic_decreasing
+        assert index.is_monotonic_increasing is False
+        assert index.is_monotonic_decreasing is False
+        assert index._is_strictly_monotonic_increasing is False
+        assert index._is_strictly_monotonic_decreasing is False
 
     def test_repr_summary(self):
         with cf.option_context('display.max_seq_items', 10):

pandas/tests/indexes/test_category.py

@@ -555,37 +555,37 @@ def test_reindex_empty_index(self):
     ])
     def test_is_monotonic(self, data, non_lexsorted_data):
         c = CategoricalIndex(data)
-        assert c.is_monotonic_increasing
-        assert not c.is_monotonic_decreasing
+        assert c.is_monotonic_increasing is True
+        assert c.is_monotonic_decreasing is False
 
         c = CategoricalIndex(data, ordered=True)
-        assert c.is_monotonic_increasing
-        assert not c.is_monotonic_decreasing
+        assert c.is_monotonic_increasing is True
+        assert c.is_monotonic_decreasing is False
 
         c = CategoricalIndex(data, categories=reversed(data))
-        assert not c.is_monotonic_increasing
-        assert c.is_monotonic_decreasing
+        assert c.is_monotonic_increasing is False
+        assert c.is_monotonic_decreasing is True
 
         c = CategoricalIndex(data, categories=reversed(data), ordered=True)
-        assert not c.is_monotonic_increasing
-        assert c.is_monotonic_decreasing
+        assert c.is_monotonic_increasing is False
+        assert c.is_monotonic_decreasing is True
 
         # test when data is neither monotonic increasing nor decreasing
         reordered_data = [data[0], data[2], data[1]]
         c = CategoricalIndex(reordered_data, categories=reversed(data))
-        assert not c.is_monotonic_increasing
-        assert not c.is_monotonic_decreasing
+        assert c.is_monotonic_increasing is False
+        assert c.is_monotonic_decreasing is False
 
         # non lexsorted categories
         categories = non_lexsorted_data
 
         c = CategoricalIndex(categories[:2], categories=categories)
-        assert c.is_monotonic_increasing
-        assert not c.is_monotonic_decreasing
+        assert c.is_monotonic_increasing is True
+        assert c.is_monotonic_decreasing is False
 
         c = CategoricalIndex(categories[1:3], categories=categories)
-        assert c.is_monotonic_increasing
-        assert not c.is_monotonic_decreasing
+        assert c.is_monotonic_increasing is True
+        assert c.is_monotonic_decreasing is False
 
     @pytest.mark.parametrize('values, expected', [
         ([1, 2, 3], True),
@@ -599,8 +599,8 @@ def test_is_unique(self, values, expected):
     def test_has_duplicates(self):
 
         idx = CategoricalIndex([0, 0, 0], name='foo')
-        assert not idx.is_unique
-        assert idx.has_duplicates
+        assert idx.is_unique is False
+        assert idx.has_duplicates is True
 
     def test_drop_duplicates(self):
 

pandas/tests/indexes/test_numeric.py

@@ -422,32 +422,32 @@ def test_view(self, indices):
         tm.assert_index_equal(i, self._holder(i_view, name='Foo'))
 
     def test_is_monotonic(self):
-        assert self.index.is_monotonic
-        assert self.index.is_monotonic_increasing
-        assert self.index._is_strictly_monotonic_increasing
-        assert not self.index.is_monotonic_decreasing
-        assert not self.index._is_strictly_monotonic_decreasing
+        assert self.index.is_monotonic is True
+        assert self.index.is_monotonic_increasing is True
+        assert self.index._is_strictly_monotonic_increasing is True
+        assert self.index.is_monotonic_decreasing is False
+        assert self.index._is_strictly_monotonic_decreasing is False
 
         index = self._holder([4, 3, 2, 1])
-        assert not index.is_monotonic
-        assert not index._is_strictly_monotonic_increasing
-        assert index._is_strictly_monotonic_decreasing
+        assert index.is_monotonic is False
+        assert index._is_strictly_monotonic_increasing is False
+        assert index._is_strictly_monotonic_decreasing is True
 
         index = self._holder([1])
-        assert index.is_monotonic
-        assert index.is_monotonic_increasing
-        assert index.is_monotonic_decreasing
-        assert index._is_strictly_monotonic_increasing
-        assert index._is_strictly_monotonic_decreasing
+        assert index.is_monotonic is True
+        assert index.is_monotonic_increasing is True
+        assert index.is_monotonic_decreasing is True
+        assert index._is_strictly_monotonic_increasing is True
+        assert index._is_strictly_monotonic_decreasing is True
 
     def test_is_strictly_monotonic(self):
         index = self._holder([1, 1, 2, 3])
-        assert index.is_monotonic_increasing
-        assert not index._is_strictly_monotonic_increasing
+        assert index.is_monotonic_increasing is True
+        assert index._is_strictly_monotonic_increasing is False
 
         index = self._holder([3, 2, 1, 1])
-        assert index.is_monotonic_decreasing
-        assert not index._is_strictly_monotonic_decreasing
+        assert index.is_monotonic_decreasing is True
+        assert index._is_strictly_monotonic_decreasing is False
 
         index = self._holder([1, 1])
         assert index.is_monotonic_increasing