bpo-39587: Enum - use correct mixed-in data type (GH-22263)

(cherry picked from commit bff01f3a3aac0c15fe8fbe8b2f561f7927d117a1)

Co-authored-by: Ethan Furman <ethan@stoneleaf.us>

1 files changed, 12 insertions, 1 deletions

diff --git a/Lib/enum.py b/Lib/enum.py
index 16033b1..dfde750 100644
--- a/Lib/enum.py
+++ b/Lib/enum.py
@@ -487,14 +487,25 @@ class EnumMeta(type):
             return object, Enum
 
         def _find_data_type(bases):
+            data_types = []
             for chain in bases:
+                candidate = None
                 for base in chain.__mro__:
                     if base is object:
                         continue
                     elif '__new__' in base.__dict__:
                         if issubclass(base, Enum):
                             continue
-                        return base
+                        data_types.append(candidate or base)
+                        break
+                    elif not issubclass(base, Enum):
+                        candidate = base
+            if len(data_types) > 1:
+                raise TypeError('too many data types: %r' % data_types)
+            elif data_types:
+                return data_types[0]
+            else:
+                return None
 
         # ensure final parent class is an Enum derivative, find any concrete
         # data type, and check that Enum has no members