Raymond Hettinger <raymond.hettin...@gmail.com> added the comment:
The __missing__() method already fulfills this need:
class DoubleDict(dict):
def __missing__(self, key):
return key * 2
If desired, it can also add entries:
class DoubleDict(dict):
def __missing__(self, key):
self[key] = value = key * 2
return value
----------
nosy: +rhettinger
resolution: -> rejected
stage: -> resolved
status: open -> closed
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue38315>
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