MAINT: Remove assertNotIn from testing (#16096)

* MAINT: Refactor _AssertRaisesContextManager

Rewrite _AssertRaisesContextManager with more
documentation and remove vestigial assertRaises.

Follow-up to gh-16089.

* MAINT: Remove assertNotIn from testing

pandas/tests/frame/test_alter_axes.py

@@ -500,16 +500,16 @@ def test_rename_nocopy(self):
 
     def test_rename_inplace(self):
         self.frame.rename(columns={'C': 'foo'})
-        self.assertIn('C', self.frame)
-        self.assertNotIn('foo', self.frame)
+        assert 'C' in self.frame
+        assert 'foo' not in self.frame
 
         c_id = id(self.frame['C'])
         frame = self.frame.copy()
         frame.rename(columns={'C': 'foo'}, inplace=True)
 
-        self.assertNotIn('C', frame)
-        self.assertIn('foo', frame)
-        self.assertNotEqual(id(frame['foo']), c_id)
+        assert 'C' not in frame
+        assert 'foo' in frame
+        assert id(frame['foo']) != c_id
 
     def test_rename_bug(self):
         # GH 5344
@@ -778,8 +778,9 @@ def test_set_index_names(self):
 
     def test_rename_objects(self):
         renamed = self.mixed_frame.rename(columns=str.upper)
-        self.assertIn('FOO', renamed)
-        self.assertNotIn('foo', renamed)
+
+        assert 'FOO' in renamed
+        assert 'foo' not in renamed
 
     def test_assign_columns(self):
         self.frame['hi'] = 'there'

pandas/tests/frame/test_analytics.py

@@ -190,10 +190,10 @@ def test_corrwith(self):
 
         dropped = a.corrwith(b, axis=0, drop=True)
         tm.assert_almost_equal(dropped['A'], a['A'].corr(b['A']))
-        self.assertNotIn('B', dropped)
+        assert 'B' not in dropped
 
         dropped = a.corrwith(b, axis=1, drop=True)
-        self.assertNotIn(a.index[-1], dropped.index)
+        assert a.index[-1] not in dropped.index
 
         # non time-series data
         index = ['a', 'b', 'c', 'd', 'e']

pandas/tests/frame/test_axis_select_reindex.py

@@ -14,9 +14,7 @@
                     date_range, isnull)
 import pandas as pd
 
-from pandas.util.testing import (assert_series_equal,
-                                 assert_frame_equal,
-                                 assertRaisesRegexp)
+from pandas.util.testing import assert_frame_equal
 
 from pandas.errors import PerformanceWarning
 import pandas.util.testing as tm
@@ -287,15 +285,15 @@ def test_reindex_like(self):
         assert_frame_equal(other, self.frame.reindex_like(other))
 
     def test_reindex_columns(self):
-        newFrame = self.frame.reindex(columns=['A', 'B', 'E'])
+        new_frame = self.frame.reindex(columns=['A', 'B', 'E'])
 
-        assert_series_equal(newFrame['B'], self.frame['B'])
-        self.assertTrue(np.isnan(newFrame['E']).all())
-        self.assertNotIn('C', newFrame)
+        tm.assert_series_equal(new_frame['B'], self.frame['B'])
+        assert np.isnan(new_frame['E']).all()
+        assert 'C' not in new_frame
 
-        # length zero
-        newFrame = self.frame.reindex(columns=[])
-        self.assertTrue(newFrame.empty)
+        # Length zero
+        new_frame = self.frame.reindex(columns=[])
+        assert new_frame.empty
 
     def test_reindex_columns_method(self):
 
@@ -659,75 +657,75 @@ def test_align_series_combinations(self):
         tm.assert_frame_equal(res2, exp1)
 
     def test_filter(self):
-        # items
+        # Items
         filtered = self.frame.filter(['A', 'B', 'E'])
-        self.assertEqual(len(filtered.columns), 2)
-        self.assertNotIn('E', filtered)
+        assert len(filtered.columns) == 2
+        assert 'E' not in filtered
 
         filtered = self.frame.filter(['A', 'B', 'E'], axis='columns')
-        self.assertEqual(len(filtered.columns), 2)
-        self.assertNotIn('E', filtered)
+        assert len(filtered.columns) == 2
+        assert 'E' not in filtered
 
-        # other axis
+        # Other axis
         idx = self.frame.index[0:4]
         filtered = self.frame.filter(idx, axis='index')
         expected = self.frame.reindex(index=idx)
-        assert_frame_equal(filtered, expected)
+        tm.assert_frame_equal(filtered, expected)
 
         # like
         fcopy = self.frame.copy()
         fcopy['AA'] = 1
 
         filtered = fcopy.filter(like='A')
-        self.assertEqual(len(filtered.columns), 2)
-        self.assertIn('AA', filtered)
+        assert len(filtered.columns) == 2
+        assert 'AA' in filtered
 
         # like with ints in column names
         df = DataFrame(0., index=[0, 1, 2], columns=[0, 1, '_A', '_B'])
         filtered = df.filter(like='_')
-        self.assertEqual(len(filtered.columns), 2)
+        assert len(filtered.columns) == 2
 
         # regex with ints in column names
         # from PR #10384
         df = DataFrame(0., index=[0, 1, 2], columns=['A1', 1, 'B', 2, 'C'])
         expected = DataFrame(
             0., index=[0, 1, 2], columns=pd.Index([1, 2], dtype=object))
         filtered = df.filter(regex='^[0-9]+$')
-        assert_frame_equal(filtered, expected)
+        tm.assert_frame_equal(filtered, expected)
 
         expected = DataFrame(0., index=[0, 1, 2], columns=[0, '0', 1, '1'])
         # shouldn't remove anything
         filtered = expected.filter(regex='^[0-9]+$')
-        assert_frame_equal(filtered, expected)
+        tm.assert_frame_equal(filtered, expected)
 
         # pass in None
-        with assertRaisesRegexp(TypeError, 'Must pass'):
+        with tm.assertRaisesRegexp(TypeError, 'Must pass'):
             self.frame.filter()
-        with assertRaisesRegexp(TypeError, 'Must pass'):
+        with tm.assertRaisesRegexp(TypeError, 'Must pass'):
             self.frame.filter(items=None)
-        with assertRaisesRegexp(TypeError, 'Must pass'):
+        with tm.assertRaisesRegexp(TypeError, 'Must pass'):
             self.frame.filter(axis=1)
 
         # test mutually exclusive arguments
-        with assertRaisesRegexp(TypeError, 'mutually exclusive'):
+        with tm.assertRaisesRegexp(TypeError, 'mutually exclusive'):
             self.frame.filter(items=['one', 'three'], regex='e$', like='bbi')
-        with assertRaisesRegexp(TypeError, 'mutually exclusive'):
+        with tm.assertRaisesRegexp(TypeError, 'mutually exclusive'):
             self.frame.filter(items=['one', 'three'], regex='e$', axis=1)
-        with assertRaisesRegexp(TypeError, 'mutually exclusive'):
+        with tm.assertRaisesRegexp(TypeError, 'mutually exclusive'):
             self.frame.filter(items=['one', 'three'], regex='e$')
-        with assertRaisesRegexp(TypeError, 'mutually exclusive'):
+        with tm.assertRaisesRegexp(TypeError, 'mutually exclusive'):
             self.frame.filter(items=['one', 'three'], like='bbi', axis=0)
-        with assertRaisesRegexp(TypeError, 'mutually exclusive'):
+        with tm.assertRaisesRegexp(TypeError, 'mutually exclusive'):
             self.frame.filter(items=['one', 'three'], like='bbi')
 
         # objects
         filtered = self.mixed_frame.filter(like='foo')
-        self.assertIn('foo', filtered)
+        assert 'foo' in filtered
 
         # unicode columns, won't ascii-encode
         df = self.frame.rename(columns={'B': u('\u2202')})
         filtered = df.filter(like='C')
-        self.assertTrue('C' in filtered)
+        assert 'C' in filtered
 
     def test_filter_regex_search(self):
         fcopy = self.frame.copy()
@@ -857,10 +855,10 @@ def test_reindex_boolean(self):
 
     def test_reindex_objects(self):
         reindexed = self.mixed_frame.reindex(columns=['foo', 'A', 'B'])
-        self.assertIn('foo', reindexed)
+        assert 'foo' in reindexed
 
         reindexed = self.mixed_frame.reindex(columns=['A', 'B'])
-        self.assertNotIn('foo', reindexed)
+        assert 'foo' not in reindexed
 
     def test_reindex_corner(self):
         index = Index(['a', 'b', 'c'])

pandas/tests/frame/test_constructors.py

@@ -210,8 +210,8 @@ def test_constructor_dict(self):
                            'col2': self.ts2})
 
         # col2 is padded with NaN
-        self.assertEqual(len(self.ts1), 30)
-        self.assertEqual(len(self.ts2), 25)
+        assert len(self.ts1) == 30
+        assert len(self.ts2) == 25
 
         tm.assert_series_equal(self.ts1, frame['col1'], check_names=False)
 
@@ -223,12 +223,12 @@ def test_constructor_dict(self):
                            'col2': self.ts2},
                           columns=['col2', 'col3', 'col4'])
 
-        self.assertEqual(len(frame), len(self.ts2))
-        self.assertNotIn('col1', frame)
-        self.assertTrue(isnull(frame['col3']).all())
+        assert len(frame) == len(self.ts2)
+        assert 'col1' not in frame
+        assert isnull(frame['col3']).all()
 
         # Corner cases
-        self.assertEqual(len(DataFrame({})), 0)
+        assert len(DataFrame({})) == 0
 
         # mix dict and array, wrong size - no spec for which error should raise
         # first
@@ -242,14 +242,14 @@ def test_constructor_dict(self):
         # empty dict plus index
         idx = Index([0, 1, 2])
         frame = DataFrame({}, index=idx)
-        self.assertIs(frame.index, idx)
+        assert frame.index is idx
 
         # empty with index and columns
         idx = Index([0, 1, 2])
         frame = DataFrame({}, index=idx, columns=idx)
-        self.assertIs(frame.index, idx)
-        self.assertIs(frame.columns, idx)
-        self.assertEqual(len(frame._series), 3)
+        assert frame.index is idx
+        assert frame.columns is idx
+        assert len(frame._series) == 3
 
         # with dict of empty list and Series
         frame = DataFrame({'A': [], 'B': []}, columns=['A', 'B'])
@@ -1533,11 +1533,11 @@ def test_from_records_to_records(self):
 
         # what to do?
         records = indexed_frame.to_records()
-        self.assertEqual(len(records.dtype.names), 3)
+        assert len(records.dtype.names) == 3
 
         records = indexed_frame.to_records(index=False)
-        self.assertEqual(len(records.dtype.names), 2)
-        self.assertNotIn('index', records.dtype.names)
+        assert len(records.dtype.names) == 2
+        assert 'index' not in records.dtype.names
 
     def test_from_records_nones(self):
         tuples = [(1, 2, None, 3),

pandas/tests/frame/test_mutate_columns.py

@@ -7,9 +7,7 @@
 
 from pandas import DataFrame, Series, Index, MultiIndex
 
-from pandas.util.testing import (assert_series_equal,
-                                 assert_frame_equal,
-                                 assertRaisesRegexp)
+from pandas.util.testing import assert_frame_equal, assertRaisesRegexp
 
 import pandas.util.testing as tm
 
@@ -163,7 +161,7 @@ def test_insert(self):
 
     def test_delitem(self):
         del self.frame['A']
-        self.assertNotIn('A', self.frame)
+        assert 'A' not in self.frame
 
     def test_delitem_multiindex(self):
         midx = MultiIndex.from_product([['A', 'B'], [1, 2]])
@@ -194,15 +192,14 @@ def test_pop(self):
         self.frame.columns.name = 'baz'
 
         self.frame.pop('A')
-        self.assertNotIn('A', self.frame)
+        assert 'A' not in self.frame
 
         self.frame['foo'] = 'bar'
         self.frame.pop('foo')
-        self.assertNotIn('foo', self.frame)
+        assert 'foo' not in self.frame
         # TODO self.assertEqual(self.frame.columns.name, 'baz')
 
-        # 10912
-        # inplace ops cause caching issue
+        # gh-10912: inplace ops cause caching issue
         a = DataFrame([[1, 2, 3], [4, 5, 6]], columns=[
                       'A', 'B', 'C'], index=['X', 'Y'])
         b = a.pop('B')
@@ -211,11 +208,11 @@ def test_pop(self):
         # original frame
         expected = DataFrame([[1, 3], [4, 6]], columns=[
                              'A', 'C'], index=['X', 'Y'])
-        assert_frame_equal(a, expected)
+        tm.assert_frame_equal(a, expected)
 
         # result
         expected = Series([2, 5], index=['X', 'Y'], name='B') + 1
-        assert_series_equal(b, expected)
+        tm.assert_series_equal(b, expected)
 
     def test_pop_non_unique_cols(self):
         df = DataFrame({0: [0, 1], 1: [0, 1], 2: [4, 5]})

pandas/tests/indexes/test_base.py

@@ -851,8 +851,8 @@ def test_add_string(self):
         index = Index(['a', 'b', 'c'])
         index2 = index + 'foo'
 
-        self.assertNotIn('a', index2)
-        self.assertIn('afoo', index2)
+        assert 'a' not in index2
+        assert 'afoo' in index2
 
     def test_iadd_string(self):
         index = pd.Index(['a', 'b', 'c'])

pandas/tests/indexes/test_interval.py

@@ -458,20 +458,20 @@ def test_get_indexer_subintervals(self):
         tm.assert_numpy_array_equal(actual, expected)
 
     def test_contains(self):
-        # only endpoints are valid
+        # Only endpoints are valid.
         i = IntervalIndex.from_arrays([0, 1], [1, 2])
 
-        # invalid
-        self.assertNotIn(0, i)
-        self.assertNotIn(1, i)
-        self.assertNotIn(2, i)
+        # Invalid
+        assert 0 not in i
+        assert 1 not in i
+        assert 2 not in i
 
-        # valid
-        self.assertIn(Interval(0, 1), i)
-        self.assertIn(Interval(0, 2), i)
-        self.assertIn(Interval(0, 0.5), i)
-        self.assertNotIn(Interval(3, 5), i)
-        self.assertNotIn(Interval(-1, 0, closed='left'), i)
+        # Valid
+        assert Interval(0, 1) in i
+        assert Interval(0, 2) in i
+        assert Interval(0, 0.5) in i
+        assert Interval(3, 5) not in i
+        assert Interval(-1, 0, closed='left') not in i
 
     def testcontains(self):
         # can select values that are IN the range of a value
@@ -509,7 +509,7 @@ def test_non_contiguous(self):
         expected = np.array([0, -1, 1], dtype='intp')
         tm.assert_numpy_array_equal(actual, expected)
 
-        self.assertNotIn(1.5, index)
+        assert 1.5 not in index
 
     def test_union(self):
         other = IntervalIndex.from_arrays([2], [3])
@@ -651,11 +651,12 @@ def test_datetime(self):
         expected = pd.date_range('2000-01-01T12:00', periods=2)
         tm.assert_index_equal(idx.mid, expected)
 
-        self.assertNotIn(pd.Timestamp('2000-01-01T12'), idx)
-        self.assertNotIn(pd.Timestamp('2000-01-01T12'), idx)
+        assert pd.Timestamp('2000-01-01T12') not in idx
+        assert pd.Timestamp('2000-01-01T12') not in idx
 
         target = pd.date_range('1999-12-31T12:00', periods=7, freq='12H')
         actual = idx.get_indexer(target)
+
         expected = np.array([-1, -1, 0, 0, 1, 1, -1], dtype='intp')
         tm.assert_numpy_array_equal(actual, expected)