Path: csiph.com!usenet.pasdenom.info!weretis.net!feeder4.news.weretis.net!rt.uk.eu.org!newsfeed.xs4all.nl!newsfeed1.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 0.003 X-Spam-Evidence: '*H*': 0.99; '*S*': 0.00; 'python,': 0.02; 'programmer': 0.03; 'yet.': 0.04; 'think,': 0.07; 'ugly': 0.07; '__init__': 0.09; 'dan': 0.09; 'received:80.91': 0.09; 'received:80.91.229': 0.09; 'received:gmane.org': 0.09; 'received:list': 0.09; 'rewrite': 0.09; 'python': 0.11; 'culturally': 0.16; 'generators.': 0.16; 'get,': 0.16; 'nod.': 0.16; 'pythonic': 0.16; 'received:80.91.229.3': 0.16; 'received:plane.gmane.org': 0.16; 'language': 0.16; 'wrote:': 0.18; 'trying': 0.19; 'comfortable': 0.22; 'header:User-Agent:1': 0.23; 'fairly': 0.24; "haven't": 0.24; 'nearly': 0.26; 'possibly': 0.26; 'header:X-Complaints-To:1': 0.27; 'generally': 0.29; 'sets': 0.30; "i'm": 0.30; 'code': 0.31; 'getting': 0.31; 'perl': 0.31; 'this.': 0.32; 'probably': 0.32; 'comment': 0.34; 'objects': 0.35; 'but': 0.35; 'really': 0.36; 'doing': 0.36; 'charset:us-ascii': 0.36; 'turn': 0.37; 'filter': 0.38; 'mine': 0.38; 'whatever': 0.38; 'to:addr:python-list': 0.38; 'to:addr:python.org': 0.39; 'received:org': 0.40; 'break': 0.61; 'new': 0.61; "you're": 0.61; 'first': 0.61; 'name': 0.63; 'refer': 0.63; 'skip:n 10': 0.64; 'choose': 0.64; 'become': 0.64; 'more': 0.64; 'finally': 0.65; 'series': 0.66; 'customers': 0.66; 'invalid': 0.68; 'sound': 0.68; 'subject:One': 0.74; 'day': 0.76; 'composing': 0.84; 'from.': 0.93 X-Injected-Via-Gmane: http://gmane.org/ To: python-list@python.org From: Neil Cerutti Subject: Re: One liners Date: Mon, 9 Dec 2013 13:49:24 +0000 (UTC) Organization: Norwich University References: <52a282d1$0$30003$c3e8da3$5496439d@news.astraweb.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Gmane-NNTP-Posting-Host: jackman.norwich.edu User-Agent: slrn/0.9.9p1/mm/ao (Win32) 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: 40 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1386596990 news.xs4all.nl 2842 [2001:888:2000:d::a6]:57170 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:61385 On 2013-12-07, Dan Stromberg wrote: > BTW, what's pipelining style? Like bash? I think, in Python, it might refer to composing your program of a series of generators. names = (p.name for p in db.query_people() if p.total_purchases > 0) names = (n.upper() for n in names) names = (n for n in names if not n.startswith("Q")) for n in names: # Finally actually do something. Coincidentally it's a nice way to break up an ugly one-liner. I also really like that if I choose to no longer filter out customers whose name begins with Q, I can just comment out that one line. Try doing that with the one-liner version! >> I'm pleased to see Python getting more popular, but it feels >> like a lot of newcomers are trying their best to turn Python >> into Perl or something, culturally speaking. > >> They're probably writing code using the idioms they are used >> to from whatever language they have come from. Newcomers >> nearly always do this. The more newcomers you get, the less >> Pythonic the code you're going to see from them. > > Nod. That's the sound of practicality slapping purity with a fish. A new Python programmer can generally just get her code working in a fairly comfortable way, then possibly rewrite it once her first few programs become horrifying years later. I haven't found time to rewrite all of mine yet. I still have a program I use almost every day with an __init__ that returns invalid objects but helpfully sets self.valid to 0. -- Neil Cerutti