Raymond Hettinger added the comment:

+1 for the idea.

Please change "failobj" to "default" to keep the terminology consistent with 
the pure Python API.  For reference, here's the code from 
collections.MutableMapping:

    def setdefault(self, key, default=None):
        try:
            return self[key]
        except KeyError:
            self[key] = default
        return default

----------
nosy: +rhettinger

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue17327>
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