BUG: Should not raise error in concatenating Series with numpy scalar and tuple names (GH21015) (pandas-dev#21132)

Author: KalyanGokhale

doc/source/whatsnew/v0.23.1.txt

@@ -87,7 +87,7 @@ Plotting
 Reshaping
 ^^^^^^^^^
 
--
+- Bug in :func:`concat` where error was raised in concatenating :class:`Series` with numpy scalar and tuple names (:issue:`21015`)
 -
 
 Categorical

pandas/core/common.py

@@ -55,8 +55,11 @@ def flatten(l):
 def _consensus_name_attr(objs):
     name = objs[0].name
     for obj in objs[1:]:
-        if obj.name != name:
-            return None
+        try:
+            if obj.name != name:
+                name = None
+        except ValueError:
+            name = None
     return name
 
 

pandas/tests/reshape/test_concat.py

@@ -2487,3 +2487,14 @@ def test_concat_aligned_sort_does_not_raise():
                             columns=[1, 'a'])
     result = pd.concat([df, df], ignore_index=True, sort=True)
     tm.assert_frame_equal(result, expected)
+
+
+@pytest.mark.parametrize("s1name,s2name", [
+    (np.int64(190), (43, 0)), (190, (43, 0))])
+def test_concat_series_name_npscalar_tuple(s1name, s2name):
+    # GH21015
+    s1 = pd.Series({'a': 1, 'b': 2}, name=s1name)
+    s2 = pd.Series({'c': 5, 'd': 6}, name=s2name)
+    result = pd.concat([s1, s2])
+    expected = pd.Series({'a': 1, 'b': 2, 'c': 5, 'd': 6})
+    tm.assert_series_equal(result, expected)