Serhiy Storchaka added the comment:
> -------------------------------------------------------------------------
> The object class implements both __reduce__() and __reduce_ex__();
> however, if a subclass overrides __reduce__() but not __reduce_ex__(),
> the __reduce_ex__() implementation detects this and calls __reduce__().
> -------------------------------------------------------------------------
This is about default object.__reduce_ex__() implementation. But base class
can override it.
>>> import enum, pickle
>>> class C(int):
... def __reduce_ex__(self, proto):
... return C, (int(self),)
...
>>> class E(C):
... X = C(42)
...
>>> y = C(42)
>>> pickle.loads(pickle.dumps(y))
42
>>> type(pickle.loads(pickle.dumps(y)))
<class '__main__.C'>
>>> pickle.loads(pickle.dumps(E.X))
42
>>> type(pickle.loads(pickle.dumps(E.X)))
<class '__main__.C'>
Well, the direct cause is that the Enum class in question failed to define
__getnewargs__; the indirect cause is that without __getnewargs__ the
metaclass will call _make_class_unpicklable.
> Well, the direct cause is that the Enum class in question failed to define
> __getnewargs__; the indirect cause is that without __getnewargs__ the
> metaclass will call _make_class_unpicklable.
>
> So neither the enum nor its members should pickle.
Actually they don't pickle due to wrong __module__. After adding
NEI.__module__ = NamedInt.__module__ = __name__
PicklingError no longer raised for enum class.
And "BadPickle.__qualname__ = 'BadPickle'" in test_exploding_pickle is
redundant, because BadPickle.__qualname__ already is 'BadPickle' (due to the
module argument in constructor).
----------
_______________________________________
Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue20534>
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