Path: csiph.com!fu-berlin.de!uni-berlin.de!not-for-mail From: Mark Lawrence Newsgroups: comp.lang.python Subject: Re: Suggestion: make sequence and map interfaces more similar Date: Sun, 27 Mar 2016 20:24:18 +0100 Lines: 35 Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit X-Trace: news.uni-berlin.de Qt0EdY5KM2vd33WxbtJ6wwl/dac8k+jdYDQCran0YuGw== 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; 'url:pypi': 0.03; 'from:addr:yahoo.co.uk': 0.05; 'incompatible': 0.07; 'method,': 0.07; 'received:80.91': 0.09; 'received:80.91.229': 0.09; 'received:gmane.org': 0.09; 'received:list': 0.09; 'bug': 0.10; '"is': 0.16; 'containers': 0.16; 'contract.': 0.16; 'received:80.91.229.3': 0.16; 'received:io': 0.16; 'received:plane.gmane.org': 0.16; 'received:psf.io': 0.16; 'subclassing': 0.16; 'subject:interfaces': 0.16; 'subject:make': 0.16; 'wrote:': 0.16; 'library,': 0.18; 'language': 0.19; 'lawrence': 0.22; 'suppose': 0.22; 'trying': 0.22; 'patch': 0.24; 'written': 0.24; 'header:In-Reply-To:1': 0.24; 'header:User- Agent:1': 0.26; 'header:X-Complaints-To:1': 0.26; 'sequence': 0.27; 'interface': 0.29; 'code': 0.30; 'e.g.': 0.30; 'language.': 0.32; 'skills.': 0.32; 'useful': 0.33; 'class': 0.33; 'problem': 0.33; 'url:python': 0.33; 'licensed': 0.35; 'something': 0.35; 'but': 0.36; 'should': 0.36; 'url:org': 0.36; 'to:addr:python- list': 0.36; 'subject:: ': 0.37; 'turn': 0.37; 'received:org': 0.37; 'why': 0.39; 'to:addr:python.org': 0.40; 'mark': 0.40; 'your': 0.60; 'provide': 0.61; 'subject:more': 0.61; 'charset:windows-1252': 0.62; 'more': 0.63; 'our': 0.64; 'inherit': 0.66; 'python-list': 0.66; 'briefly,': 0.84; 'dict.': 0.84; 'pythonistas,': 0.84; 'on?': 0.91; 'dirty': 0.93 X-Injected-Via-Gmane: http://gmane.org/ X-Gmane-NNTP-Posting-Host: 195.147.217.247 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:38.0) Gecko/20100101 Thunderbird/38.7.1 In-Reply-To: X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: General discussion list for the Python programming language List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Xref: csiph.com comp.lang.python:105868 On 27/03/2016 19:01, Marco S. via Python-list wrote: > > Mark Lawrence wrote: > >> I cannot see this happening unless you provide a patch on the bug >> tracker. However I suspect you can get the same thing by subclassing >> dict. Why don't you try it and let us know how you get on? > > The problem with a vdict is that I should also create by zero a new > interface (ABC), since MutableMapping have an incompatible contract. > And to be much more useful I should code it inc C, and my C skills are > not so magnificent. Furthermore I would try to create a new sequence > interface that inherit from the vdict interface. More briefly, I need > much free time. But I suppose I can start with something quick and > dirty. > Why do you need a new interace if all you're trying to do is create a vdict class that has "iter(d) == iter(d.values()), and should also have a count() method, like sequence types"? I don't understand why you think you need C skills. E.g. SortedContainers https://pypi.python.org/pypi/sortedcontainers "is an Apache2 licensed containers library, written in pure-Python, and fast as C-extensions." I think your quick and dirty might well turn into something useful for your application. -- My fellow Pythonistas, ask not what our language can do for you, ask what you can do for our language. Mark Lawrence