Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!1.eu.feeder.erje.net!newsfeed.xs4all.nl!newsfeed4.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 0.000 X-Spam-Evidence: '*H*': 1.00; '*S*': 0.00; 'cpython': 0.05; 'works.': 0.07; '*is*': 0.09; 'instance.': 0.09; 'received:80.91': 0.09; 'received:80.91.229': 0.09; 'received:gmane.org': 0.09; 'received:list': 0.09; 'subclass': 0.09; 'subject:fields': 0.09; 'def': 0.14; 'b=2)': 0.16; 'initialiser': 0.16; 'm.a': 0.16; 'paulo': 0.16; 'received:80.91.229.3': 0.16; 'received:dip0.t-ipconnect.de': 0.16; 'received:plane.gmane.org': 0.16; 'received:t-ipconnect.de': 0.16; 'subject:object': 0.16; 'wrote:': 0.16; 'language': 0.19; '>>>': 0.20; '(the': 0.22; 'class,': 0.22; 'pass': 0.22; 'import': 0.24; 'seems': 0.24; 'written': 0.24; 'example': 0.25; 'header:User-Agent:1': 0.26; 'header:X-Complaints-To:1': 0.26; 'updating': 0.27; 'actual': 0.29; '**kwargs):': 0.29; 'skip:_ 10': 0.32; 'implement': 0.32; 'point': 0.33; 'class': 0.33; 'to:addr:python-list': 0.35; 'but': 0.36; 'thanks': 0.36; 'subject:: ': 0.37; 'detail': 0.38; 'received:org': 0.38; 'does': 0.39; 'to:addr:python.org': 0.39; 'received:de': 0.40; 'skip:t 20': 0.40; 'some': 0.40; 'your': 0.60; 'making': 0.64; '>>>>>': 0.66; 'otten': 0.84 X-Injected-Via-Gmane: http://gmane.org/ To: python-list@python.org From: Peter Otten <__peter__@web.de> Subject: Re: Passing new fields to an object Date: Fri, 12 Jun 2015 21:12:26 +0200 Organization: None References: Mime-Version: 1.0 Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 7Bit X-Gmane-NNTP-Posting-Host: p57bd8810.dip0.t-ipconnect.de User-Agent: KNode/4.13.3 X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.20+ 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: 57 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1434136357 news.xs4all.nl 2900 [2001:888:2000:d::a6]:36886 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:92548 Paulo da Silva wrote: > On 12-06-2015 17:17, Peter Otten wrote: >> Paulo da Silva wrote: >> > ... > >> >>>>> import types >>>>> class C(types.SimpleNamespace): >> ... pass >> ... >>>>> c = C(f1=1, f2=None) >>>>> c >> C(f1=1, f2=None) >> > > Thanks for all your explanations. > This solution works. Would you please detail a little on how it works? > Or just point me out some readings. > I am confused because types.SimpleNamespace seems to be a class! It *is* a class, and by making C a subclass of SimpleNamespace C inherits the initialiser which does the actual work of updating the __dict__ of the C instance. > From docs ...: > class SimpleNamespace: > def __init__(self, **kwargs): > self.__dict__.update(kwargs) The actual implementation is written in C (the language used to implement the CPython interpreter), but following the example in the docs you can make your own SimpleNamespace... >>> class MySimpleNamespace: ... def __init__(self, **parms): self.__dict__.update(parms) ... >>> m = MySimpleNamespace(a=1, b=2) >>> m.a 1 >>> m.b 2 and when you subclass it the subclass inherits the behaviour: >>> class C(MySimpleNamespace): ... pass ... >>> c = C(x=10, y=20) >>> c.x 10 >>> c.y 20