[3.7] bpo-29577: Enum: mixin classes don't mix well with already mixed Enums (GH-9328)backport-5bdab64-3.7

* bpo-29577: allow multiple mixin classes.
(cherry picked from commit 5bdab641da0afd8aa581dfbde4f82d88d337c4b5)

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

1 files changed, 19 insertions, 31 deletions

diff --git a/Lib/enum.py b/Lib/enum.py
index 69b41fe7cb..4e8a56818b 100644
--- a/Lib/enum.py
+++ b/Lib/enum.py
@@ -449,37 +449,25 @@ class EnumMeta(type):
         if not bases:
             return object, Enum
 
-        # double check that we are not subclassing a class with existing
-        # enumeration members; while we're at it, see if any other data
-        # type has been mixed in so we can use the correct __new__
-        member_type = first_enum = None
-        for base in bases:
-            if  (base is not Enum and
-                    issubclass(base, Enum) and
-                    base._member_names_):
-                raise TypeError("Cannot extend enumerations")
-        # base is now the last base in bases
-        if not issubclass(base, Enum):
-            raise TypeError("new enumerations must be created as "
-                    "`ClassName([mixin_type,] enum_type)`")
-
-        # get correct mix-in type (either mix-in type of Enum subclass, or
-        # first base if last base is Enum)
-        if not issubclass(bases[0], Enum):
-            member_type = bases[0]     # first data type
-            first_enum = bases[-1]  # enum type
-        else:
-            for base in bases[0].__mro__:
-                # most common: (IntEnum, int, Enum, object)
-                # possible:    (<Enum 'AutoIntEnum'>, <Enum 'IntEnum'>,
-                #               <class 'int'>, <Enum 'Enum'>,
-                #               <class 'object'>)
-                if issubclass(base, Enum):
-                    if first_enum is None:
-                        first_enum = base
-                else:
-                    if member_type is None:
-                        member_type = base
+        def _find_data_type(bases):
+            for chain in bases:
+                for base in chain.__mro__:
+                    if base is object:
+                        continue
+                    elif '__new__' in base.__dict__:
+                        if issubclass(base, Enum) and not hasattr(base, '__new_member__'):
+                            continue
+                        return base
+
+        # ensure final parent class is an Enum derivative, find any concrete
+        # data type, and check that Enum has no members
+        first_enum = bases[-1]
+        if not issubclass(first_enum, Enum):
+            raise TypeError("new enumerations should be created as "
+                    "`EnumName([mixin_type, ...] [data_type,] enum_type)`")
+        member_type = _find_data_type(bases) or object
+        if first_enum._member_names_:
+            raise TypeError("Cannot extend enumerations")
 
         return member_type, first_enum