Steven D'Aprano <steve+pyt...@pearwood.info> added the comment:
This feature is already provided by just supplying a `__missing__` dunder:
py> class MyDict(dict):
... def __missing__(self, key):
... return "The key is {}".format(key)
...
py> d = MyDict()
py> d[1234]
'The key is 1234'
I'm closing this ticket, but if the discussion on Python-Ideas reaches
consensus that your class is necessary, feel free to re-open it.
----------
nosy: +steven.daprano
resolution: -> out of date
stage: -> resolved
status: open -> closed
_______________________________________
Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue40248>
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