Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!eu.feeder.erje.net!newsfeed.xs4all.nl!newsfeed2a.news.xs4all.nl!xs4all!newsgate.cistron.nl!newsgate.news.xs4all.nl!post.news.xs4all.nl!not-for-mail Return-Path: X-Original-To: python-list@python.org Delivered-To: python-list@mail.python.org X-Spam-Status: OK 0.002 X-Spam-Evidence: '*H*': 1.00; '*S*': 0.00; 'python,': 0.02; 'sys': 0.07; '__name__': 0.09; 'def': 0.12; "'__main__':": 0.16; '1):': 0.16; 'from:addr:mrabarnett.plus.com': 0.16; 'from:addr:python': 0.16; 'from:name:mrab': 0.16; 'message-id:@mrabarnett.plus.com': 0.16; 'range.': 0.16; 'received:192.168.1.4': 0.16; 'wrote:': 0.18; 'thanks.': 0.20; 'import': 0.22; 'header:User-Agent:1': 0.23; 'header:In-Reply-To:1': 0.27; 'skip:p 30': 0.29; 'code': 0.31; 'but': 0.35; 'christian': 0.38; 'to:addr:python-list': 0.38; 'to:addr:python.org': 0.39; 'number,': 0.60; 'working,': 0.84 X-CM-Score: 0.00 X-CNFS-Analysis: v=2.1 cv=Uv7tNoAB c=1 sm=1 tr=0 a=0nF1XD0wxitMEM03M9B4ZQ==:117 a=0nF1XD0wxitMEM03M9B4ZQ==:17 a=0Bzu9jTXAAAA:8 a=u9EReRu7m0cA:10 a=ud-rJsx2cw0A:10 a=ihvODaAuJD4A:10 a=IkcTkHD0fZMA:10 a=EBOSESyhAAAA:8 a=1k8tVCmLsIsoajvAgbAA:9 a=ZaU6IrPwevLogwaT:21 a=hQy8CGZTjEqMxzIL:21 a=QEXdDO2ut3YA:10 X-AUTH: mrabarnett:2500 Date: Fri, 05 Sep 2014 19:48:34 +0100 From: MRAB User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:24.0) Gecko/20100101 Thunderbird/24.6.0 MIME-Version: 1.0 To: python-list@python.org Subject: Re: My backwards logic References: <1enj0att6bkrnvb81rhma5dbuk3h28agl8@4ax.com> <5409EE02.7030308@stoneleaf.us> In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: General discussion list for the Python programming language List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Newsgroups: comp.lang.python Message-ID: Lines: 23 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1409942918 news.xs4all.nl 2961 [2001:888:2000:d::a6]:58707 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:77608 On 2014-09-05 18:35, Juan Christian wrote: > I made this code just for fun and learning, it's working, but would this > be a good approach? Thanks. > > import sys > > > def prime_checker(start = 1, stop = 1): In Python, the standard is to use a half-open range. > for number in range(start, stop + 1): > divisors = [(number % x) for x in range(1, number + 1)] > print("{n} prime? {r}".format(n = number, r = (divisors.count(0) == 2))) > You want to know only whether it's prime, so why continue looking after finding a factor? > > if __name__ == '__main__': > prime_checker(int(sys.argv[1]), int(sys.argv[2])) > [snip]