changing ibase.default_index instead of additional case in Series.__init__

Author: SaturnFromTitan

pandas/core/indexes/base.py

@@ -5580,6 +5580,8 @@ def _validate_join_method(method):
 def default_index(n):
     from pandas.core.indexes.range import RangeIndex
 
+    if n == 0:
+        return Index([])
     return RangeIndex(0, n, name=None)
 
 

pandas/core/series.py

@@ -299,11 +299,7 @@ def __init__(
             if index is None:
                 if not is_list_like(data):
                     data = [data]
-
-                if is_empty_data(data):
-                    index = Index([])
-                else:
-                    index = ibase.default_index(len(data))
+                index = ibase.default_index(len(data))
 
             elif is_list_like(data):
 

pandas/tests/frame/test_constructors.py

@@ -84,9 +84,9 @@ def test_empty_constructor(self, constructor):
     @pytest.mark.parametrize(
         "emptylike,expected_index,expected_columns",
         [
-            ([[]], RangeIndex(1), RangeIndex(0)),
-            ([[], []], RangeIndex(2), RangeIndex(0)),
-            ([(_ for _ in [])], RangeIndex(1), RangeIndex(0)),
+            ([[]], RangeIndex(1), Index([])),
+            ([[], []], RangeIndex(2), Index([])),
+            ([(_ for _ in [])], RangeIndex(1), Index([])),
         ],
     )
     def test_emptylike_constructor(self, emptylike, expected_index, expected_columns):
@@ -337,7 +337,7 @@ def test_constructor_dict(self):
 
         # with dict of empty list and Series
         frame = DataFrame({"A": [], "B": []}, columns=["A", "B"])
-        tm.assert_index_equal(frame.index, Index([], dtype=np.int64))
+        tm.assert_index_equal(frame.index, Index([]))
 
         # GH 14381
         # Dict with None value

pandas/tests/series/test_api.py

@@ -497,7 +497,7 @@ async def test_tab_complete_warning(self, ip):
         pytest.importorskip("IPython", minversion="6.0.0")
         from IPython.core.completer import provisionalcompleter
 
-        code = "import pandas as pd; s = pd.Series()"
+        code = "import pandas as pd; s = pd.Series(dtype=object)"
         await ip.run_code(code)
         with tm.assert_produces_warning(None):
             with provisionalcompleter("ignore"):