I was just reading a "Python Speed/Performance Tips" article on the Python wiki http://wiki.python.org/moin/PythonSpeed/PerformanceTips and I got to the part that talks about string concatenation and that it is faster when using join instead of += because of strings being immutable. So I have tried it:
from time import time t=time() s='almfklasmfkmaskmkmasfkmkqemkmqeqw' for x in range(40): #s+= s[len(s)/2:] s="".join((s,s[len(s)/2:])) print 'duration', time() - t And I get 1.55016708374 for the concatenation and 3.01116681099 for the join. I have also tried to put the join outside but it is still a little bit over 3. I'm using Python 2.4.2, GCC 3.3.3 (SuSE Linux). So what am I doing wrong ? -- http://mail.python.org/mailman/listinfo/python-list