On Dec 29 2008, 8:36 am, prueba...@latinmail.com wrote: > On Dec 23, 5:21 pm, Isaac Gouy <igo...@yahoo.com> wrote: > > > On Dec 23, 11:51 am, bearophileh...@lycos.com wrote: > > > > They have translated the Python benchmarks of theShootoutsite from > > > Py2 to Py3 using 2to3: > > > >http://shootout.alioth.debian.org/u32/benchmark.php?test=all〈=pyt... > > > So please re-write those programs to remove problems created by > > automatic translation and better take advantage of Python 3 > > functionality... > > >http://shootout.alioth.debian.org/u32/faq.php#play > > > > It shows some "performance bugs" of Python3 itself (especially > > > regarding the binary-trees benchmark, that was unexpected by me), and > > > two points where 2to3 may be improved, for example after the > > > translation this gives error: > > > table=string.maketrans('ACBDGHK\nMNSRUTWVYacbdghkmnsrutwvy', > > > 'TGVHCDM > > > \nKNSYAAWBRTGVHCDMKNSYAAWBR')): > > > > Gives: > > > TypeError: maketrans arguments must be bytes objects > > > > Bye, > > > bearophile > > BTW I am not sure how to submit this or if this is actually valid to > do, but I have a faster version for the pidigits program that uses > basically the same algorithm but removes function calls and unused > terms of the formula. > > <pre> > import time > > def pi_digits(n, width): > out = [] > wrt = out.append > aq = 1 > ar = 0 > at = 1 > k = 0 > f = 1 > g = 2 > i = 0 > while i < n: > y = (aq*3+ar)//at > while y != ((aq*4+ar)//at): > k += 1 > f += 2 > g += 4 > ar = aq*g+ar*f > aq = aq*k > at = at*f > y = (aq*3+ar)//at > aq = 10*aq > ar = 10*ar-10*y*at > i += 1 > wrt(str(y)) > if not i%width: > wrt('\t:%d\n'%i) > wrt(' '*(width-i%width)) > wrt('\t:%d\n'%i) > return ''.join(out) > > def main(): > begin = time.time() > n = 1000 > width = 70 > print pi_digits(n,width) > print 'Total Time:', time.time()-begin > > main() > > </pre>
http://shootout.alioth.debian.org/u32q/faq.php#play -- http://mail.python.org/mailman/listinfo/python-list
