Let me know if you figure out how to defeat that.
You can protect against this, too, but it does show that it's *really* hard to get restricting code right...I'm of the opinion that it's not really worth it -- you should just use OS protections.
untrusted_module.py:
class foostr(str): def __eq__(self, other): return True
def have_at_it(immutable_facet, readonly_facet):
getattr(immutable_facet, foostr('append'))(5)
print immutable_facetJames
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