Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > comp.lang.python > #8242
| Path | csiph.com!x330-a1.tempe.blueboxinc.net!usenet.pasdenom.info!aioe.org!feeder.news-service.com!newsfeed.xs4all.nl!newsfeed6.news.xs4all.nl!xs4all!post.news.xs4all.nl!not-for-mail |
|---|---|
| Return-Path | <ethan@stoneleaf.us> |
| X-Original-To | python-list@python.org |
| Delivered-To | python-list@mail.python.org |
| X-Spam-Status | OK 0.001 |
| X-Spam-Evidence | '*H*': 1.00; '*S*': 0.00; 'example:': 0.03; 'python': 0.08; 'from:addr:ethan': 0.09; 'from:addr:stoneleaf.us': 0.09; 'from:name:ethan furman': 0.09; 'message-id:@stoneleaf.us': 0.09; 'readable': 0.09; 'received:gator410.hostgator.com': 0.09; '~ethan~': 0.09; 'wrote:': 0.14; 'blah': 0.16; 'iterator': 0.16; 'iterators,': 0.16; 'received:72.11': 0.16; 'received:72.11.125': 0.16; 'received:72.11.125.166': 0.16; 'cc:addr:python-list': 0.17; 'header:In-Reply-To:1': 0.21; 'cc:2**0': 0.22; 'cc:no real name:2**0': 0.23; 'loop,': 0.23; 'works.': 0.23; 'subject:?': 0.29; 'cc:addr:python.org': 0.30; 'header:User-Agent:1': 0.35; 'something': 0.37; 'change': 0.37; 'limitation': 0.37; 'but': 0.38; 'subject:: ': 0.38; 'list,': 0.39; 'believe': 0.66; 'received:websitewelcome.com': 0.67; 'concept': 0.73; "'e'": 0.84; 'received:gateway15.websitewelcome.com': 0.84; 'sequence:': 0.84 |
| Date | Wed, 22 Jun 2011 13:04:40 -0700 |
| From | Ethan Furman <ethan@stoneleaf.us> |
| User-Agent | Thunderbird 1.5.0.10 (Windows/20070221) |
| MIME-Version | 1.0 |
| To | Neal Becker <ndbecker2@gmail.com> |
| Subject | Re: writable iterators? |
| References | <ittfon$nku$1@dough.gmane.org> |
| In-Reply-To | <ittfon$nku$1@dough.gmane.org> |
| Content-Type | text/plain; charset=ISO-8859-1; format=flowed |
| Content-Transfer-Encoding | 7bit |
| X-AntiAbuse | This header was added to track abuse, please include it with any abuse report |
| X-AntiAbuse | Primary Hostname - gator410.hostgator.com |
| X-AntiAbuse | Original Domain - python.org |
| X-AntiAbuse | Originator/Caller UID/GID - [47 12] / [47 12] |
| X-AntiAbuse | Sender Address Domain - stoneleaf.us |
| X-BWhitelist | no |
| X-Source | |
| X-Source-Args | |
| X-Source-Dir | |
| X-Source-Sender | mail.admailinc.com ([192.168.10.136]) [72.11.125.166]:1982 |
| X-Source-Auth | ethan+stoneleaf.us |
| X-Email-Count | 1 |
| X-Source-Cap | dG9idWs7dG9idWs7Z2F0b3I0MTAuaG9zdGdhdG9yLmNvbQ== |
| Cc | python-list@python.org |
| X-BeenThere | python-list@python.org |
| X-Mailman-Version | 2.1.12 |
| Precedence | list |
| List-Id | General discussion list for the Python programming language <python-list.python.org> |
| List-Unsubscribe | <http://mail.python.org/mailman/options/python-list>, <mailto:python-list-request@python.org?subject=unsubscribe> |
| List-Archive | <http://mail.python.org/pipermail/python-list> |
| List-Post | <mailto:python-list@python.org> |
| List-Help | <mailto:python-list-request@python.org?subject=help> |
| List-Subscribe | <http://mail.python.org/mailman/listinfo/python-list>, <mailto:python-list-request@python.org?subject=subscribe> |
| Newsgroups | comp.lang.python |
| Message-ID | <mailman.297.1308772187.1164.python-list@python.org> (permalink) |
| Lines | 24 |
| NNTP-Posting-Host | 82.94.164.166 |
| X-Trace | 1308772188 news.xs4all.nl 14139 [::ffff:82.94.164.166]:46234 |
| X-Complaints-To | abuse@xs4all.nl |
| Xref | x330-a1.tempe.blueboxinc.net comp.lang.python:8242 |
Show key headers only | View raw
Neal Becker wrote:
> AFAICT, the python iterator concept only supports readable iterators, not write.
> Is this true?
>
> for example:
>
> for e in sequence:
> do something that reads e
> e = blah # will do nothing
>
> I believe this is not a limitation on the for loop, but a limitation on the
> python iterator concept. Is this correct?
No. e = blah will rebind the indentifier 'e' with 'blah' whatever that
is. That is how python works.
Now, if e is mutable, say a list, you can do
e.append(blah)
and, since the name 'e' is not being rebound, you would see the change
in 'sequence'.
~Ethan~
Back to comp.lang.python | Previous | Next | Find similar | Unroll thread
Re: writable iterators? Ethan Furman <ethan@stoneleaf.us> - 2011-06-22 13:04 -0700
csiph-web