[Python-Dev] PySequence_Concat for dicts
Jared Flatow
jflatow at northwestern.edu
Sat Jan 12 02:07:37 CET 2008
On Jan 11, 2008, at 6:45 PM, Raymond Hettinger wrote:
> IMO, the chainmap() recipe on ASPN is a much better solution since
> it doesn't create a third dictionary with the all the attendant
> allocation and copying effort.
I wasn't suggesting that the result of concatenation would be a
chained table, rather that it would perform the equivalent of an
update and return the new dict (the same way extend works for lists).
> It isn't a common use case to need to sum two dictionaries while
> keeping both of the inputs unaltered.
Inplace concatenation could be implemented more efficiently but would
be exactly the same as calling update.
jared
More information about the Python-Dev
mailing list