[issue30408] [defaultdict] default_factory should accept a "key" default parameter (which can be passed my __missing__)

[Raymond Hettinger]

Raymond Hettinger added the comment:

Take a look at the __missing__(key) method for the regular dict API to see if 
it meets your needs.  It is in the ``d[key]`` section at 
https://docs.python.org/3/library/stdtypes.html#dict 

>>> class UpperDict(dict):
        def __missing__(self, key):
            return key.upper()

>>> d = UpperDict()
>>> print(d['tom'])
TOM

----------
assignee:  -> rhettinger
nosy: +rhettinger

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