Your wrapper class can also, I think:
Swallow exceptions, especially AttributeError
Specify the sentinel, if it is not None
Work for getitem
Mixing is indeed more difficult, and there is probably performance impact.
Still, it's general and does not need to touch the implementation of the class
you want to descend...
I like it better than the operators
Another idea, may be stupid, maybe not: what if None fails with a subinstance
of AttributeError, and a subinstance of KeyError, or IndexError. Then a
try/except catching only those exceptions would also work quite nicely...
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