python disk i/o speed

Peter Hansen peter at
Thu Aug 8 13:44:22 CEST 2002

nnes wrote:
> Thanks all of you!
> After reading the enlightening comments I came up with a new version.
> It looks nicer too :-).
> Jeffs code looked like out of a Cookbook: use re for input and % for
> output on stdio and you have got almost unlimited flexibility, and if
> you understand regular expresions you know exactly what´s going on. It
> was slower of course. Now I wish the print format syntax and the re
> syntax were somehow unified.
> The other approaches were similar to mine using split. Some also using
> map and reduce which would be good if I had more than 3 variables. I
> will test it later, but I doubt it will improve the speed.
> Unfortunately the speedup is not near I would have expected. From the
> old 36 seconds down to 33 seconds (using python -O). So I am still
> open to suggestions.

Why don't you run the profiler on it and see where the time is
being spent?  Random arbitrary optimizations is a waste of developer
time, and generally makes the code less maintainable.

(And Duncan's comments are still highly relevant.)


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