Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > comp.lang.python > #41630
| Path | csiph.com!newsfeed.hal-mli.net!feeder3.hal-mli.net!newsfeed.hal-mli.net!feeder2.hal-mli.net!feeder.erje.net!eu.feeder.erje.net!dedekind.zen.co.uk!zen.net.uk!hamilton.zen.co.uk!reader01.nrc01.news.zen.net.uk.POSTED!not-for-mail |
|---|---|
| From | Nobody <nobody@nowhere.com> |
| Subject | Re: x += ... is not the same than x = x + ... if x is mutable |
| Date | Thu, 21 Mar 2013 04:27:38 +0000 |
| User-Agent | Pan/0.14.2 (This is not a psychotic episode. It's a cleansing moment of clarity.) |
| Message-Id | <pan.2013.03.21.04.27.38.40000@nowhere.com> |
| Newsgroups | comp.lang.python |
| References | <b5bfb026-fea4-4aec-8185-cc8837e1559a@googlegroups.com> |
| MIME-Version | 1.0 |
| Content-Type | text/plain; charset=UTF-8 |
| Content-Transfer-Encoding | 8bit |
| Lines | 13 |
| Organization | Zen Internet |
| NNTP-Posting-Host | 348a5a8d.news.zen.co.uk |
| X-Trace | DXC=ONWnCb3;KM0\c0=1\i[2^3a0UP_O8AJo<=dR0\ckLKG0WeZ<[7LZNR68EblaVK`U]5M2Z^cWRFGA;oR1`;=bfb;6 |
| X-Complaints-To | abuse@zen.co.uk |
| Xref | csiph.com comp.lang.python:41630 |
Show key headers only | View raw
On Wed, 20 Mar 2013 07:17:08 -0700, bartolome.sintes wrote: > I thought that x += ... was the same than x = x + ..., but today I have > realized it is not true when operating with mutable objects. It may or may not be the same. x += y will invoke x.__iadd__(y) if x has an __iadd__ method, otherwise x + y will be evaluated and the result assigned to x. In the first case, x will always continue to refer to the same object (i.e. id(x) won't change). In the second case, x will typically (but not always) refer to a different object.
Back to comp.lang.python | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
x += ... is not the same than x = x + ... if x is mutable bartolome.sintes@gmail.com - 2013-03-20 07:17 -0700
Re: x += ... is not the same than x = x + ... if x is mutable Jussi Piitulainen <jpiitula@ling.helsinki.fi> - 2013-03-20 16:26 +0200
Re: x += ... is not the same than x = x + ... if x is mutable Nobody <nobody@nowhere.com> - 2013-03-21 04:27 +0000
Re: x += ... is not the same than x = x + ... if x is mutable "Colin J. Williams" <cjw@ncf.ca> - 2013-03-21 08:35 -0400
Re: x += ... is not the same than x = x + ... if x is mutable Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-03-21 12:39 +0000
csiph-web