[Python-Dev] TransformDict (PEP 455) Naming
v+python at g.nevcal.com
Mon Sep 16 17:31:58 CEST 2013
On 9/15/2013 11:28 PM, anatoly techtonik wrote:
> Does anybody know if http://vote.python.org is already operational?
> I decided to start a separate thread for TransformDict name, because I
> want to change it.
> Current implementation of PEP 455 only touches dictionary keys and it
> is more narrow than the name suggests. I'd reserve TransformDict name
> for something that is used to transform some other data. For my data
> transformation theory I have an idea of mapping with annotated fields
> that is used to change the names of some source data structure to
> target data structure, converting types and applying custom rules on
> the way. This is a different, but more intuitive application of such
The multitude of data transformations that are possible are certainly
broader than the scope of TransformDict. However, such transformations
have little to do with the operation of a dict ... the key
characteristic of a dict is accessing data by key value, and the idea of
transformation for a dict is easily understood to be a transformation of
that access pattern, rather than a rich transformation of the data.
Rich data transformations may be useful, and if possible to abstract a
large number of useful data transformations into an API that would
become popular, it would seem that such transformations would want to be
applied not only to dict, but also to list and other data structures. It
would be more of an object-to-object mapping, independent of the
container that might hold the object during part of its lifetime.
Hence, it seems unlikely to me that "dict" would be part of the name or
requirements for such rich data transformations, leaving TransformDict
available to be used for exactly what PEP 455 proposes.
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