MAINT: Remove vestigial self.assert* (pandas-dev#16190)

Remove all remaining self.assert*
method calls originating from unittest.
Any that are left are calls to methods
directly defined in the test class or
a higher derived pandas test class.

pandas/tests/frame/test_repr_info.py

@@ -331,13 +331,13 @@ def test_info_memory_usage(self):
         res = buf.getvalue().splitlines()
         assert re.match(r"memory usage: [^+]+$", res[-1])
 
-        self.assertGreater(df_with_object_index.memory_usage(index=True,
-                                                             deep=True).sum(),
-                           df_with_object_index.memory_usage(index=True).sum())
+        assert (df_with_object_index.memory_usage(
+            index=True, deep=True).sum() > df_with_object_index.memory_usage(
+            index=True).sum())
 
         df_object = pd.DataFrame({'a': ['a']})
-        self.assertGreater(df_object.memory_usage(deep=True).sum(),
-                           df_object.memory_usage().sum())
+        assert (df_object.memory_usage(deep=True).sum() >
+                df_object.memory_usage().sum())
 
         # Test a DataFrame with duplicate columns
         dtypes = ['int64', 'int64', 'int64', 'float64']

pandas/tests/io/formats/test_style.py

@@ -374,7 +374,7 @@ def test_bar_align_mid_pos_and_neg(self):
                              '#5fba7d 10.0%, #5fba7d 100.0%, '
                              'transparent 100.0%)']}
 
-        self.assertEqual(result, expected)
+        assert result == expected
 
     def test_bar_align_mid_all_pos(self):
         df = pd.DataFrame({'A': [10, 20, 50, 100]})
@@ -399,7 +399,7 @@ def test_bar_align_mid_all_pos(self):
                              'transparent 0%, transparent 0.0%, #5fba7d 0.0%, '
                              '#5fba7d 100.0%, transparent 100.0%)']}
 
-        self.assertEqual(result, expected)
+        assert result == expected
 
     def test_bar_align_mid_all_neg(self):
         df = pd.DataFrame({'A': [-100, -60, -30, -20]})

pandas/tests/test_nanops.py

@@ -914,11 +914,11 @@ def test_constant_series(self):
     def test_all_finite(self):
         alpha, beta = 0.3, 0.1
         left_tailed = self.prng.beta(alpha, beta, size=100)
-        self.assertLess(nanops.nanskew(left_tailed), 0)
+        assert nanops.nanskew(left_tailed) < 0
 
         alpha, beta = 0.1, 0.3
         right_tailed = self.prng.beta(alpha, beta, size=100)
-        self.assertGreater(nanops.nanskew(right_tailed), 0)
+        assert nanops.nanskew(right_tailed) > 0
 
     def test_ground_truth(self):
         skew = nanops.nanskew(self.samples)
@@ -964,11 +964,11 @@ def test_constant_series(self):
     def test_all_finite(self):
         alpha, beta = 0.3, 0.1
         left_tailed = self.prng.beta(alpha, beta, size=100)
-        self.assertLess(nanops.nankurt(left_tailed), 0)
+        assert nanops.nankurt(left_tailed) < 0
 
         alpha, beta = 0.1, 0.3
         right_tailed = self.prng.beta(alpha, beta, size=100)
-        self.assertGreater(nanops.nankurt(right_tailed), 0)
+        assert nanops.nankurt(right_tailed) > 0
 
     def test_ground_truth(self):
         kurt = nanops.nankurt(self.samples)