[Python-Dev] PySequence_Concat for dicts

[Raymond Hettinger]

[Jared]
> I think it would be convenient and pythonic if dict
> objects implemented the PySequence_Concat method. 

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. It isn't a common use case to need to sum two dictionaries while keeping both of the inputs unaltered.

http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/305268.

Raymond