Subsetting a dictionary

[Aahz Maruch]

In article <995hj6$dk6$1 at newsg3.svr.pol.co.uk>,
Will Newton  <will at nospam.misconception.org.uk> wrote:
>Emile van Sebille wrote:
>>
>> Rather than copying and then deleting from the copy, try building a new
>> dictionary while adding only those that qualify.
>
>On average this makes the code ~10x slower. I haven't done an in depth 
>analysis of how the routine is called, but my "backwards" way of doing 
>things seems much faster for my task.

While it's possible you're right, my gut instinct is that Emile's way
will be faster unless your subset almost always includes most of the
dictionary.
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