code optimization (calc PI)
michael at mustun.ch
Wed Jan 3 20:04:36 CET 2007
Hmm.. thanks. I did this changes, but without any performance profits.
> Using the '+' operator for string concatonation can be slow, especially
> when done many times in a loop.
>> pi = pi + str("%04d" % int(e + d/a)) ## this should be fast?! I dont
> The accepted solution would be to make pi an array and append to the
> pi =  #create the array (empty)
> pi.append(str("%04d"%int(e+d/a))) # append to it
> And when it is time to print the results do the following:
> print "".join(pi)
> It may look strange, but it is a common Python idiom. You might also
> look into an optimizer such as psycho: http://psyco.sourceforge.net/.
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