> > Consulting two dictionaries instead of one is a very very very
>
> minor penalty.
>
> It's more than twice as expensive: not only do you have to do two look
> ups rather than one, but you have to also look up the second dict as
> well. And there's the overhead of the ChainMap itself.
>
>
> $ ./python -m timeit -s "d = {}" "d.get('aardvark')"
> 500000 loops, best of 5: 702 nsec per loop
>
> $ ./python -m timeit -s "from collections import ChainMap" -s "d =
> ChainMap([{}, {}])" "d.get('aardvark')"
> 20000 loops, best of 5: 12.3 usec per loop
>
> That's 17 times slower on my PC.
>
Well that's the death rattle on that particular crackpot idea.
>
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