06.10.13 00:08, Victor Stinner написав(ла):
2013/10/4 Raymond Hettinger <raymond.hettin...@gmail.com <javascript:;>>:
> This contrasts with other tools like OrderedDict, ChainMap,
> and namedtuple which started their lives outside the standard
> library where we we able observe their fitness for real problems
> being solved by real users.
Why do you say that TransformDict has no real use case, whereas similar
containers are already used since many years in the Python standard
library? Extract of the PEP:
"Several modules in the standard library use identity lookups for object
memoization, for example pickle, json, copy, cProfile, doctest and
_threading_local."
I didn't check this whole list, but it looks like some modules can
directly use TransformDict(id), see for example the copy module.
Unfortunately the pickle and the copy modules can't use
TransformDict(id) because they expose their mappings (with integer id
keys) in public API. At least until Python 4.0.
There are no so much use cases for IdentityDict in stdlib now, and even
less for CaseInsensityDict. And a workaround is simple. I don't know
about usage of TransformDict with other transfom function.
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