On Fri, 21 Aug 2009 14:40:30 -0500, David C Ullrich wrote: > On Thu, 20 Aug 2009 16:51:00 -0700, Aahz wrote: > >> In article <mailman.143.1250793404.2854.python-l...@python.org>, >> Benjamin Kaplan <benjamin.kap...@case.edu> wrote: >>>On Thu, Aug 20, 2009 at 2:13 PM, David C Ullrich<dullr...@sprynet.com> >>>wrot= e: >>>> >>>> I just noticed that >>>> sequence[i:j:k] >>> >>>Well, I got some good news and some bad news. According to the docs, it >>>existed in 1.4 but the built-in sequences didn't support it until 2.3. >>>It's not used that often anyway so you haven't been missing much. >> >> Except that it's canonical for one specific operation: >> >> 'reverseme'[::-1] > > It's like you guys are a bunch of programmers or something: > > from math import sqrt > > def Primes(n): > """Return a list of the primes < n""" sieve = range(n) > for k in range(2,int(sqrt(n))+2): > sieve[::k] = [1]*((n+k-1)/k) > return [p for p in sieve if p > 1]
Oops. Should have tested that a little more carefully before posting. No time to fix it right now, customer just got here. Let's just say we're looking for the primes between sqrt(n) and n... -- http://mail.python.org/mailman/listinfo/python-list
