Path: csiph.com!usenet.pasdenom.info!dedibox.gegeweb.org!gegeweb.eu!nntpfeed.proxad.net!proxad.net!feeder1-2.proxad.net!usenet-fr.net!nerim.net!novso.com!newsfeed.xs4all.nl!newsfeed6.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 0.033 X-Spam-Evidence: '*H*': 0.93; '*S*': 0.00; 'python': 0.09; '22,': 0.09; 'subject:into': 0.09; 'cc:addr:python-list': 0.10; '2.7.3': 0.16; 'list)': 0.16; 'map(int,': 0.16; 'reason.': 0.16; 'sequence.': 0.16; 'subject:Converting': 0.16; 'wrote:': 0.17; 'jan': 0.18; '>>>': 0.18; 'file.': 0.20; 'cc:2**0': 0.23; "i've": 0.23; 'seems': 0.23; 'cc:no real name:2**0': 0.24; 'cc:addr:python.org': 0.25; 'header:In-Reply-To:1': 0.25; 'header :User-Agent:1': 0.26; 'looks': 0.26; 'wondering': 0.26; 'subject:list': 0.28; "i'm": 0.29; 'code': 0.31; 'could': 0.32; 'everyone': 0.33; 'hi,': 0.33; 'that,': 0.34; "can't": 0.34; 'changed': 0.34; 'list': 0.35; 'built-in': 0.35; 'returning': 0.35; 'pm,': 0.35; 'subject:?': 0.35; 'but': 0.36; 'functional': 0.36; 'does': 0.37; 'option': 0.37; 'uses': 0.37; 'why': 0.37; 'far': 0.37; 'subject:: ': 0.38; 'things': 0.38; 'sure': 0.38; 'instead': 0.39; 'performance': 0.39; 'hello,': 0.39; 'help': 0.40; 'map': 0.61; 'more': 0.63; 'jul': 0.65; 'header:Reply-To:1': 0.68; 'reply-to:no real name:2**0': 0.72; 'brain,': 0.84; 'clearer': 0.84; 'quicker': 0.84; 'am.': 0.91 Date: Sun, 22 Jul 2012 20:10:34 +0300 From: Jan Riechers User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:14.0) Gecko/20120713 Thunderbird/14.0 MIME-Version: 1.0 To: David Robinow Subject: Re: Converting a list of strings into a list of integers? References: <3rCdnUCiWpP1gZHNnZ2dnUVZ7vQAAAAA@giganews.com> <500C2842.4040204@freenet.de> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: python-list@python.org X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.12 Precedence: list Reply-To: janpeterr@freenet.de 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: 35 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1342977192 news.xs4all.nl 6889 [2001:888:2000:d::a6]:49591 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:25824 On 22.07.2012 20:03, David Robinow wrote: > On Sun, Jul 22, 2012 at 12:20 PM, Jan Riechers wrote: >> On 22.07.2012 18:39, Alister wrote: >>> looks like a classic list comprehension to me and can be achieved in a >>> single line >>> MODUS_LIST=[int(x) for x in options.modus_list] >> Hi, >> >> I am not sure why everyone is using the for-iterator option over a "map", >> but I would do it like that: >> MODUS_LIST= map(int, options.modus_list) >> >> "map" works on a list and does commandX (here "int" conversion, use "str" >> for string.. et cetera) on sequenceY, returning a sequence. More in the help >> file. >> >> And if I'm not completely mistaken, it's also the quicker way to do >> performance wise. But I can't completely recall the exact reason. > Because if you don't have a functional background 'map' is > unfamiliar. Although I've been aware of it for years I still can't > remember if it's map(int, list) or map(list,int) and although with a > small effort I could force it into my brain, I know that many of the > people reading my code are as ignorant as I am. The list comprehension > seems clearer to me. > > Hello, no offense by that, I just was wondering why everyone uses the list comprehension instead the built-in map in this case - I'm still using Python 2.7.3 so perhaps things might have changed a little. :) So far Jan