Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!goblin3!goblin2!goblin.stu.neva.ru!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 0.013 X-Spam-Evidence: '*H*': 0.97; '*S*': 0.00; 'python,': 0.02; 'though:': 0.07; 'incorrect': 0.09; 'cc:addr:python-list': 0.10; 'assume': 0.11; '"terry': 0.16; 'assumptions': 0.16; 'received:209.85.210.42': 0.16; 'reedy"': 0.16; 'wrote:': 0.17; 'shape': 0.17; 'memory': 0.18; 'fairly': 0.21; "i'd": 0.22; '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; 'wondering': 0.26; 'question': 0.27; 'reporting': 0.29; 'source': 0.29; "i'm": 0.29; 'that,': 0.34; 'received:google.com': 0.34; 'doing': 0.35; 'pm,': 0.35; 'received:192.168.0': 0.35; 'received:209.85': 0.35; 'something': 0.35; 'there': 0.35; 'but': 0.36; 'message- id:@gmail.com': 0.36; 'too': 0.36; 'charset:us-ascii': 0.36; 'subject: (': 0.36; 'quite': 0.37; 'received:209': 0.37; 'far': 0.37; 'received:192': 0.39; 'received:192.168': 0.40; 'safe': 0.63; 'times': 0.63; 'skip:n 10': 0.63; 'making': 0.64; 'subject:. ': 0.66; 'felt': 0.75; 'bitten': 0.84; 'findings': 0.91 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=x-received:user-agent:date:subject:from:to:cc:message-id :thread-topic:in-reply-to:mime-version:content-type :content-transfer-encoding; bh=tdP6wy5M+6wpZ7gwOIqPYMwV+uRc/0j4Btu9BLD0HYk=; b=aQWkK259/8/fmP3VQiT7gDJZX43VEGXQr2n2NjWEEZs2PL8udohWfhtnMHjUMl+2Q0 L2q52oqR0QT/pVGgpwWoP1jLoAlrJvrbHiiEwlaYCboSC/87QdBMy/g1CFjw/rumCu7n JVUuQwpKH+q9sd2xmzV3L1wMXHszihyA01ipA7ZeiRwL72E86I3f0z72hg+PvqRLV9+w SdWFtu2galmSkT6HOC88IE1agHXFUfX8WSuRFhPv0xVK3cbaboXfJO/rHcpRKYv+zDN/ GmKTOVqV8JmU3lOx/kbPw/7d4EbvD6wsa2YolJk8glfQAsI74R1AILEc5fZjbxmzei9V 7oaA== X-Received: by 10.66.85.103 with SMTP id g7mr13897662paz.45.1360304696315; Thu, 07 Feb 2013 22:24:56 -0800 (PST) User-Agent: Microsoft-MacOutlook/14.3.0.121105 Date: Thu, 07 Feb 2013 22:24:49 -0800 Subject: memoryview (was "len() on mutables vs. immutables") From: Demian Brecht To: Terry Reedy Thread-Topic: memoryview (was "len() on mutables vs. immutables") In-Reply-To: <51147F71.2050706@udel.edu> Mime-version: 1.0 Content-type: text/plain; charset="US-ASCII" Content-transfer-encoding: 7bit Cc: python-list@python.org 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: 18 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1360304707 news.xs4all.nl 6940 [2001:888:2000:d::a6]:36615 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:38416 On 2013-02-07 8:30 PM, "Terry Reedy" wrote: >So you may assume I've been bitten far too many times by incorrect assumptions about implementations that ended up actually doing something quite silly. Having said that, I felt fairly safe in making that assumption with Python, but figured I'd write something about my findings as I dug around the source in order to answer the question for myself. Still wondering about memoryview though: If a memoryview (3+) is representing a non-continuguous block of memory (> 1 ndim), will len(obj) not return incorrect results? It seems to be reporting the shape of the 0th dim at the moment.. Or is there something that I'm missing altogether?