[Python-ideas] adding dictionaries
Stephen J. Turnbull
stephen at xemacs.org
Tue Jul 29 02:16:08 CEST 2014
Alexander Heger writes:
> It seems it would be valuable to parallel the behaviour of operators
> already in place for collections.
Mappings aren't collections. In set theory, of course, they are
represented as *appropriately restricted* collections, but the meaning
of "+" as applied to mappings in mathematics varies. For functions on
the same domain, there's usually an element-wise meaning that's
applied. For functions on different domains, I've seen it used to
mean "apply the appropriate function on the disjoint union of the
domains".
I don't think there's an obvious winner in the competition among the
various meanings.
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