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This is used for testing support for ExtensionClass in new interfaces.
>>> class A(object):
... __metaclass__ = MetaClass
... a = 1
...
>>> A.__name__
'A'
>>> A.__bases__ == (object,)
True
>>> class B(object):
... __metaclass__ = MetaClass
... b = 1
...
>>> class C(A, B): pass
...
>>> C.__name__
'C'
>>> int(C.__bases__ == (A, B))
1
>>> a = A()
>>> aa = A()
>>> a.a
1
>>> aa.a
1
>>> aa.a = 2
>>> a.a
1
>>> aa.a
2
>>> c = C()
>>> c.a
1
>>> c.b
1
>>> c.b = 2
>>> c.b
2
>>> C.c = 1
>>> c.c
1
>>> int(C.__class__.__class__ is C.__class__)
1
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