changing the class of a python object (casting)

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The footnotes one that page says:

[1] It is possible in some cases to change an object’s type, under
certain controlled conditions. It generally isn’t a good idea though,
since it can lead to some very strange behaviour if it is handled
incorrectly.

If you try to change the __class__ of f2 to list:

f2.__class__ = list

A TypeError raised:

TypeError: __class__ assignment: only for heap types

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