On Tue, May 19, 2009 at 1:19 PM, spir <denis.s...@free.fr> wrote: > Thank you Albert, Kent, Sanders, Lie, Malcolm. > > This time regex wins! Thought it wouldn't because of the additional func call > (too bad we cannot pass a mapping to re.sub). Actually the diff. is very > small ;-) The relevant change is indeed using a dict.
The substChar() function is only called when a control character is found, so the relative time between the regex version and the next best will depend on the character mix. Your random strings seem a bit heavy on control chars. My guess is that the reason regex is a win is because it gets rid of the explicit Python-coded loop. > Replacing string concat with ''.join() is slower (tested with 10 times and > 100 times bigger strings too). Strange... > Membership test in a set is only very slightly faster than in dict keys. String concatenation has been optimized for this use case in recent versions of Python. Kent _______________________________________________ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
