speedup up dictionary access

[Aahz Maruch]

In article <zGjL6.59773$%K2.9919552 at typhoon.nyroc.rr.com>,
Darrell <news at dorb.com> wrote:
>
>Last I checked exceptions are slower than "if--else"

IIRC, exceptions are slower, but if exceptions are rarely raised, a try
block is faster.
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