thanks, i was not just being lazy. i wanted to play with decorators and
tell people on the forums how cool python is :)
cheers for getting back to me, i could have done that myself i think,
bar the error checking. do you have any links on good practice in
python (i do think i am very lazy re: error checking and would like to
make myself better)
cheers, tom
Fredrik Lundh wrote:
> [EMAIL PROTECTED] wrote:
>
> > all of the memoize decorators at the python cookbook seem to make my
> > code slower.
>
> if you want good performance, use the following pattern:
>
> def col(n, count, memo={}):
> try:
> return memo[n, count]
> except KeyError:
> # ... calculate value ...
> memo[n, count] = value
> return value
>
> for some access patterns, the following may be faster:
>
> def col(n, count, memo={}):
> value = memo.get((n, count))
> if value is None:
> # ... calculate value ...
> memo[n, count] = value
> return value
>
> to get maximum performance, make the memo dictionary public, and make
> the check at the original call site.
>
> > is using a decorator a lazy and inefficient way of doing memoization?
>
> lazy, yes. inefficient? it depends.
>
> </F>
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