When where and how can i change the __class__ attr of an object?

Question

I\'d like to be able to do:

>>> class a(str):
...     pass
...
>>> b = a()
>>> b.__class__ = str
Traceback (most recent call last)         


        

Answer 1

Only classes that were defined with a class keyword could be used for __class__ attribute assignment:

>>> class C:
    pass

>>> class D:
    pass

>>> C().__class__ = D
>>>