Fix more tests

Author: mroeschke

pandas/tests/frame/test_reductions.py

@@ -707,8 +707,8 @@ def test_mode_sortwarning(self, using_infer_string):
 
     def test_mode_empty_df(self):
         df = DataFrame([], columns=["a", "b"])
+        expected = df.copy()
         result = df.mode()
-        expected = DataFrame([], columns=["a", "b"], index=Index([], dtype=np.int64))
         tm.assert_frame_equal(result, expected)
 
     def test_operators_timedelta64(self):
@@ -769,7 +769,7 @@ def test_operators_timedelta64(self):
 
         # excludes non-numeric
         result = mixed.min(axis=1, numeric_only=True)
-        expected = Series([1, 1, 1.0], index=[0, 1, 2])
+        expected = Series([1, 1, 1.0])
         tm.assert_series_equal(result, expected)
 
         # works when only those columns are selected

pandas/tests/groupby/test_groupby.py

@@ -858,7 +858,7 @@ def test_groupby_level_nonmulti():
 def test_groupby_complex():
     # GH 12902
     a = Series(data=np.arange(4) * (1 + 2j), index=[0, 0, 1, 1])
-    expected = Series((1 + 2j, 5 + 10j))
+    expected = Series((1 + 2j, 5 + 10j), index=Index([0, 1]))
 
     result = a.groupby(level=0).sum()
     tm.assert_series_equal(result, expected)
@@ -1203,7 +1203,10 @@ def test_groupby_nat_exclude():
     )
     grouped = df.groupby("dt")
 
-    expected = [Index([1, 7]), Index([3, 5])]
+    expected = [
+        RangeIndex(start=1, stop=13, step=6),
+        RangeIndex(start=3, stop=7, step=2),
+    ]
     keys = sorted(grouped.groups.keys())
     assert len(keys) == 2
     for k, e in zip(keys, expected):
@@ -2663,7 +2666,9 @@ def test_groupby_method_drop_na(method):
             Series(["a", "b", "c"], name="A")
         )
     else:
-        expected = DataFrame({"A": ["a", "b", "c"], "B": [0, 2, 4]}, index=[0, 2, 4])
+        expected = DataFrame(
+            {"A": ["a", "b", "c"], "B": [0, 2, 4]}, index=range(0, 6, 2)
+        )
     tm.assert_frame_equal(result, expected)
 
 

pandas/tests/indexing/test_indexing.py

@@ -783,7 +783,7 @@ def test_loc_range_in_series_indexing(self, size):
         tm.assert_series_equal(s.loc[range(1)], Series(42.0, index=[0]))
 
         s.loc[range(2)] = 43
-        tm.assert_series_equal(s.loc[range(2)], Series(43.0, index=[0, 1]))
+        tm.assert_series_equal(s.loc[range(2)], Series(43.0, index=range(2)))
 
     def test_partial_boolean_frame_indexing(self):
         # GH 17170