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]
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