changing the class of a python object (casting)

Question

On this python doc page it says:

Like its identity, an object’s type is also unchangeable.

And I try this script,

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Answer 1

Old question but here's a technique for safely extending the type of a python object.

def extendObject(obj):
    # Our extended type is explicitly derived from our existing type.
    class Extended(obj.__class__):
        # Whatever extensions you want to make.
        def someMethod(self):
            pass
    # Change the type of the object.
    obj.__class__ = Extended
    return obj