Nathaniel Smith added the comment:

Well, yeah, that indeed sucks.

Not sure what the best solution is. Some options:

1) "Don't do that then"

2) Explicitly add a "__class__" property to every immutable type, that 
unconditionally errors out on assignment.

3) Add a hack to typeobject.c checking for the important immutable types

4) Something cleverer...? A new type flag?

The immutable types are: int, float, str, tuple, bool, frozenset, complex, 
bytes, and... anything else?

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<http://bugs.python.org/issue24912>
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