Neil Girdhar added the comment:
>From your comment:
>>> MyDerivedDynamic = new_class("MyDerivedDynamic", (MyClass,),
>>> dict(metaclass=metaclass_callable))
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/lib64/python3.5/types.py", line 57, in new_class
return meta(name, bases, ns, **kwds)
File "<stdin>", line 2, in metaclass_callable
TypeError: metaclass conflict: the metaclass of a derived class must be a
(non-strict) subclass of the metaclasses of all its bases
This is in the wrong place. It should be tripping the exception you defined in
Lib/types.py. (It will do that if you replace metaclass_callable with
OtherMetaclass.)
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<http://bugs.python.org/issue28437>
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