Close issue20653: allow Enum subclasses to override __reduce_ex__

1 files changed, 13 insertions, 13 deletions

diff --git a/Lib/enum.py b/Lib/enum.py
index 794f68e60c..c9bd7c047c 100644
--- a/Lib/enum.py
+++ b/Lib/enum.py
@@ -116,12 +116,14 @@ class EnumMeta(type):
         enum_class._value2member_map_ = {}
 
         # check for a supported pickle protocols, and if not present sabotage
-        # pickling, since it won't work anyway
-        if member_type is not object:
-            methods = ('__getnewargs_ex__', '__getnewargs__',
-                    '__reduce_ex__', '__reduce__')
-            if not any(map(member_type.__dict__.get, methods)):
-                _make_class_unpicklable(enum_class)
+        # pickling, since it won't work anyway.
+        # if new class implements its own __reduce_ex__, do not sabotage
+        if classdict.get('__reduce_ex__') is None:
+            if member_type is not object:
+                methods = ('__getnewargs_ex__', '__getnewargs__',
+                        '__reduce_ex__', '__reduce__')
+                if not any(map(member_type.__dict__.get, methods)):
+                    _make_class_unpicklable(enum_class)
 
         # instantiate them, checking for duplicates as we go
         # we instantiate first instead of checking for duplicates first in case
@@ -167,7 +169,7 @@ class EnumMeta(type):
 
         # double check that repr and friends are not the mixin's or various
         # things break (such as pickle)
-        for name in ('__repr__', '__str__', '__format__', '__getnewargs__', '__reduce_ex__'):
+        for name in ('__repr__', '__str__', '__format__', '__reduce_ex__'):
             class_method = getattr(enum_class, name)
             obj_method = getattr(member_type, name, None)
             enum_method = getattr(first_enum, name, None)
@@ -192,8 +194,9 @@ class EnumMeta(type):
         (i.e. Color = Enum('Color', names='red green blue')).
 
         When used for the functional API: `module`, if set, will be stored in
-        the new class' __module__ attribute; `type`, if set, will be mixed in
-        as the first base class.
+        the new class' __module__ attribute; `qualname`, if set, will be stored
+        in the new class' __qualname__ attribute; `type`, if set, will be mixed
+        in as the first base class.
 
         Note: if `module` is not set this routine will attempt to discover the
         calling module by walking the frame stack; if this is unsuccessful
@@ -465,14 +468,11 @@ class Enum(metaclass=EnumMeta):
             val = self.value
         return cls.__format__(val, format_spec)
 
-    def __getnewargs__(self):
-        return (self._value_, )
-
     def __hash__(self):
         return hash(self._name_)
 
     def __reduce_ex__(self, proto):
-        return self.__class__, self.__getnewargs__()
+        return self.__class__, (self._value_, )
 
     # DynamicClassAttribute is used to provide access to the `name` and
     # `value` properties of enum members while keeping some measure of