series, frame passing

Author: TomAugspurger

pandas/core/generic.py

@@ -5232,7 +5232,9 @@ def finalize_name(objs):
         elif method == "align_series":
             assert isinstance(other, tuple)
             self.allows_duplicate_labels = merge_all(other, duplicate_labels)
-            self.name = finalize_name(other)
+            if self.ndim == 1:
+                # apparently called with DataFrame too
+                self.name = other[0].name
         elif method in {"groupby-aggregate", "window"}:
             self.allows_duplicate_labels = other.obj.allows_duplicate_labels
 

pandas/core/groupby/generic.py

@@ -274,7 +274,9 @@ def aggregate(self, func, *args, **kwargs):
             result = result.iloc[:, order]
             result.columns = columns
 
-        return result._convert(datetime=True).__finalize__(method="groupby-aggregate")
+        return result._convert(datetime=True).__finalize__(
+            self, method="groupby-aggregate"
+        )
 
     agg = aggregate