Ethan Furman added the comment:
On 09/11/2013 02:39 PM, Tim Delaney wrote on PyDev:
>
> I would think that retrieving the keys from the dict would return the
> transformed keys (I'd
> call them canonical keys).
The more I think about this the more I agree. A canonicaldict with a key
function that simply stored the transformed key and it's value would seem to be
a lot simpler:
- no need to store a separate "presentation" key
- no confusion about which of the first key/last key seen is stored
- no mistakes with the "first" key not being added before real data
and getting the presentation key wrong
Further, in order to store the non-canonical keys a separate list must be kept
of the keys to preseed the canonicaldict; if we store the canonical keys a
separate list must be kept for presentation purposes -- so worst case scenario
we're keeping the same amount of information and best-case scenario the
presentation of the keys doesn't matter and we just saved ourselves an extra
data structure.
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<http://bugs.python.org/issue18986>
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