Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!1.eu.feeder.erje.net!ecngs!feeder2.ecngs.de!217.188.199.168.MISMATCH!takemy.news.telefonica.de!telefonica.de!newsfeed.xs4all.nl!newsfeed2.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 0.038 X-Spam-Evidence: '*H*': 0.92; '*S*': 0.00; '*args,': 0.09; 'constructor': 0.09; 'def': 0.12; 'args,': 0.16; 'none.': 0.16; 'subject:object': 0.16; 'subject:skip:m 10': 0.16; 'wrote:': 0.18; 'wed,': 0.18; 'header:In-Reply-To:1': 0.27; 'am,': 0.29; 'andrew': 0.30; 'message-id:@mail.gmail.com': 0.30; '13,': 0.31; '>>>>': 0.31; 'class': 0.32; 'skip:_ 10': 0.34; 'received:google.com': 0.35; 'returning': 0.36; 'to:addr:python-list': 0.38; 'anything': 0.39; 'does': 0.39; 'to:addr:python.org': 0.39; 'new': 0.61; "you're": 0.61; 'skip:n 10': 0.64; '2015': 0.84 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :content-type; bh=C31SrXRMJnBTZpF9FdanLBuzk6p8bsR/S3/YHUJ8p+U=; b=G8Tp/I/5zvllzZKkaqg4TSdLFLbQL5txEXM/Jqjp3muCOMdHy5BOTujeEdhWv5pIyR +rRK+yTnL49q+ZcQQgXked/ZmGxiPvfczK1r6PzMjx4dIdWdipm24zX9CdsJW2iTSxaZ SfvuUDgy2I57+JaItDPuR1pzNMxbLn0bcJlBFt0YY9ZyGjaZgODagaiXyZsDnKrRV7pq ZuwKthIOySRHktM8G5DV3rTk4yC7TLYru2ovQJ+mC3mKgYsPbLyfUXKx3yeMqDNZK/v5 V7BjnUNwyQIEjYDYxcj493UKnwA5F5Czuacv4aNUIiBFYUdySGOSG6XAJ7tYarQdu33c De8g== X-Received: by 10.50.30.69 with SMTP id q5mr105099igh.11.1431528959971; Wed, 13 May 2015 07:55:59 -0700 (PDT) MIME-Version: 1.0 In-Reply-To: References: <25ba3a96-21ee-4a83-b7c1-8ac60508d30c@googlegroups.com> <06301cb8-39a6-410b-9fad-afe6bd4d3217@googlegroups.com> From: Ian Kelly Date: Wed, 13 May 2015 08:55:19 -0600 Subject: Re: Basic misunderstanding on object creation To: Python Content-Type: text/plain; charset=UTF-8 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: 17 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1431528969 news.xs4all.nl 2894 [2001:888:2000:d::a6]:58205 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:90561 On Wed, May 13, 2015 at 8:45 AM, andrew cooke wrote: >>>> class Foo: > ... def __new__(cls, *args, **kargs): > ... print('new', args, kargs) > ... super().__new__(cls) > ... >>>> class Bar(Foo): > ... def __init__(self, a): > ... print('init', a) > ... >>>> Bar(1) > new (1,) {} > > no "init" is printed. You're not returning anything from Foo.__new__, so the result of the constructor is None. None.__init__ does nothing.