Path: csiph.com!usenet.pasdenom.info!news.etla.org!news.stack.nl!newsfeed.xs4all.nl!newsfeed1.news.xs4all.nl!xs4all!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; 'syntax': 0.04; 'true,': 0.05; 'subject:two': 0.07; '[],': 0.09; 'builtin': 0.09; 'iterate': 0.09; 'subject:into': 0.09; 'cc:addr:python-list': 0.11; 'expression.': 0.16; 'iterator': 0.16; 'lambda': 0.16; 'path:': 0.16; 'smith"': 0.16; 'subject:based': 0.16; ':-)': 0.16; 'wrote:': 0.18; 'wed,': 0.18; 'memory': 0.22; 'cc:addr:python.org': 0.22; 'rid': 0.24; 'cc:2**0': 0.24; 'pass': 0.26; 'least': 0.26; 'gets': 0.27; 'header:In-Reply-To:1': 0.27; 'idea': 0.28; 'subject:list': 0.30; 'message-id:@mail.gmail.com': 0.30; "i'm": 0.30; 'url:mailman': 0.30; 'constant': 0.31; 'url:python': 0.33; 'continuing': 0.33; 'could': 0.34; 'requirement': 0.35; 'but': 0.35; 'received:google.com': 0.35; 'there': 0.35; 'url:listinfo': 0.36; 'subject:?': 0.36; 'url:org': 0.36; 'list': 0.37; 'skip:o 20': 0.38; '8bit%:86': 0.38; 'pm,': 0.38; 'anything': 0.39; '12,': 0.39; 'sure': 0.39; 'url:mail': 0.40; 'to:addr:gmail.com': 0.65; 'phil': 0.84; 'usage.': 0.84; '2013': 0.98 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; bh=TENzQylyIg/aUa0VzJsIcEZHnRo2e9jQQsKQTVi8N98=; b=stgVlr8inMrCDHMwmhNG2L/sIGt2fvxMNhIDCGFxbHfIh7MAmRKgMmPH1o5GamVC+r Gzniluxhn74oyLv5AM6rq3CLoJ84gdIeir3aREtpWay/14iTjrlofmz1xlZGVQ/IMnPx GKOvNN7u0l2bXZdX7owlHkdvcmVzVl/xKRayunMplo5diViI9i9sLPrq2wGHl1CVl8C5 jjuIg1QMtf2yMx0kM5dqelWnstdlqiKdRnnnG0HhXbjnasut/yEkbGZFYWXHWMgXCKzp eLAQ7aH3mi2WNGl+Ocmo2ycveKpC/eOBvYr2tqKZo6Km3mmBr20sb387IntdrvX5T+V6 KsVg== MIME-Version: 1.0 X-Received: by 10.224.214.134 with SMTP id ha6mr25181438qab.77.1371056240561; Wed, 12 Jun 2013 09:57:20 -0700 (PDT) In-Reply-To: References: Date: Wed, 12 Jun 2013 17:57:20 +0100 Subject: Re: Split a list into two parts based on a filter? From: =?ISO-8859-1?Q?F=E1bio_Santos?= To: Serhiy Storchaka Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Cc: "python-list@python.org" 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: 38 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1371056243 news.xs4all.nl 15959 [2001:888:2000:d::a6]:48239 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:47818 Why is there no builtin to consume a generator? I find that odd. On Wed, Jun 12, 2013 at 5:28 PM, Serhiy Storchaka wro= te: > 12.06.13 09:32, Phil Connell =D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=D0=B2(= =D0=BB=D0=B0): >> >> On 12 Jun 2013 01:36, "Roy Smith" > >> >> wrote: >> > Well, continuing down this somewhat bizarre path: >> > >> > new_songs, old_songs =3D [], [] >> > itertools.takewhile( >> > lambda x: True, >> > (new_songs if s.is_new() else old_songs).append(s) for s in songs= ) >> > ) >> > >> > I'm not sure I got the syntax exactly right, but the idea is anything >> > that will iterate over a generator expression. That at least gets ri= d >> > of the memory requirement to hold the throw-away list :-) >> >> You could equivalently pass the generator to deque() with maxlen=3D0 - >> this consumes the iterator with constant memory usage. > > > any((new_songs if s.is_new() else old_songs).append(s) for s in songs) > > > -- > http://mail.python.org/mailman/listinfo/python-list --=20 F=C3=A1bio Santos