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The patch looks fine.  Assigning to Guido for 
pronouncement.

Guido, the patch adds optional get() like functionality for 
dict.pop().  The nearest parallel is the default argument for 
getattr(obj, attr, [default]).  On the plus side, it makes pop 
easier to use and more flexible.  On the minus side, it adds 
more complexity to the mapping interface and it slows 
down the normal case for d.pop(k).

If it is accepted the poster should add test cases, a NEWS 
item, doc updates, and parallel changes to 
UserDict.UserDict and UserDict.DictMixin.  Then, re-assign 
to me and I'll check it all and apply it.