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| References | (8 earlier) <jh9d7i$d6q$1@dough.gmane.org> <mailman.5739.1329084873.27778.python-list@python.org> <roy-E2270B.17273412022012@news.panix.com> <4f384b6e$0$29986$c3e8da3$5496439d@news.astraweb.com> <4F38536A.2030208@davea.name> |
|---|---|
| Date | 2012-02-13 11:59 +1100 |
| Subject | Re: Python usage numbers |
| From | Chris Angelico <rosuav@gmail.com> |
| Newsgroups | comp.lang.python |
| Message-ID | <mailman.5750.1329094801.27778.python-list@python.org> (permalink) |
On Mon, Feb 13, 2012 at 11:03 AM, Dave Angel <d@davea.name> wrote: > On 02/12/2012 06:29 PM, Steven D'Aprano wrote: >> I think you mean 4 times as many bytes as characters. Unless you have 32 >> bit bytes :) >> >> > Until you have 32 bit bytes, you'll continue to have encodings, even if only > a couple of them. The advantage, though, is that you can always know how many bytes to read for X characters. In ASCII, you allocate 80 bytes of storage and you can store 80 characters. In UTF-8, if you want an 80-character buffer, you can probably get away with allocating 240 characters... but maybe not. In UTF-32, it's easy - just allocate 320 bytes and you know you can store them. Also, you know exactly where the 17th character is; in UTF-8, you have to count. That's a huge advantage for in-memory strings; but is it useful on disk, where (as likely as not) you're actually looking for lines, which you still have to scan for? I'm thinking not, so it makes sense to use a smaller disk image than UTF-32 - less total bytes means less sectors to read/write, which translates fairly directly into performance. ChrisA
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Re: Python usage numbers Chris Angelico <rosuav@gmail.com> - 2012-02-12 12:28 +1100
Re: Python usage numbers Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-02-12 02:23 +0000
Re: Python usage numbers Rick Johnson <rantingrickjohnson@gmail.com> - 2012-02-11 18:36 -0800
Re: Python usage numbers Chris Angelico <rosuav@gmail.com> - 2012-02-12 15:38 +1100
Re: Python usage numbers Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-02-12 05:51 +0000
Re: Python usage numbers Chris Angelico <rosuav@gmail.com> - 2012-02-12 17:08 +1100
Re: Python usage numbers Roy Smith <roy@panix.com> - 2012-02-12 10:48 -0500
Re: Python usage numbers Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2012-02-12 11:47 -0500
Re: Python usage numbers Roy Smith <roy@panix.com> - 2012-02-12 12:11 -0500
Re: Python usage numbers Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-02-12 22:49 +0000
Re: Python usage numbers Dan Sommers <dan@tombstonezero.net> - 2012-02-12 15:55 +0000
Re: Python usage numbers rusi <rustompmody@gmail.com> - 2012-02-12 08:50 -0800
Re: Python usage numbers Roy Smith <roy@panix.com> - 2012-02-12 12:21 -0500
Re: Python usage numbers Nick Dokos <nicholas.dokos@hp.com> - 2012-02-12 12:36 -0500
entering unicode (was Python usage numbers) rusi <rustompmody@gmail.com> - 2012-02-12 19:09 -0800
Re: entering unicode (was Python usage numbers) Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-02-19 03:44 +0000
Re: entering unicode (was Python usage numbers) rusi <rustompmody@gmail.com> - 2012-02-19 00:52 -0800
How do you Unicode proponents type your non-ASCII characters? (was: Python usage numbers) Ben Finney <ben+python@benfinney.id.au> - 2012-02-13 09:43 +1100
Re: Python usage numbers Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-02-12 22:56 +0000
Re: Python usage numbers Roy Smith <roy@panix.com> - 2012-02-12 10:13 -0500
Re: Python usage numbers Terry Reedy <tjreedy@udel.edu> - 2012-02-12 17:07 -0500
Re: Python usage numbers Roy Smith <roy@panix.com> - 2012-02-12 17:22 -0500
Re: Python usage numbers Chris Angelico <rosuav@gmail.com> - 2012-02-13 09:14 +1100
Re: Python usage numbers Roy Smith <roy@panix.com> - 2012-02-12 17:27 -0500
Re: Python usage numbers Dave Angel <davea@dejaviewphoto.com> - 2012-02-12 17:40 -0500
Re: Python usage numbers Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-02-12 23:29 +0000
Re: Python usage numbers Roy Smith <roy@panix.com> - 2012-02-12 18:41 -0500
Re: Python usage numbers Dave Angel <d@davea.name> - 2012-02-12 19:03 -0500
Re: Python usage numbers Chris Angelico <rosuav@gmail.com> - 2012-02-13 11:59 +1100
Re: Python usage numbers Roy Smith <roy@panix.com> - 2012-02-12 20:11 -0500
Re: Python usage numbers Christian Heimes <lists@cheimes.de> - 2012-02-13 01:00 +0100
Re: Python usage numbers Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2012-02-12 21:37 -0500
Re: Python usage numbers Terry Reedy <tjreedy@udel.edu> - 2012-02-12 22:09 -0500
Re: Python usage numbers Roy Smith <roy@panix.com> - 2012-02-12 22:57 -0500
Re: Python usage numbers Ben Finney <ben+python@benfinney.id.au> - 2012-02-13 15:19 +1100
Re: Python usage numbers Andrew Berg <bahamutzero8825@gmail.com> - 2012-02-13 12:26 -0600
Re: Python usage numbers jmfauth <wxjmfauth@gmail.com> - 2012-02-14 00:00 -0800
Re: Python usage numbers Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-02-12 06:10 +0000
Re: Python usage numbers Andrew Berg <bahamutzero8825@gmail.com> - 2012-02-12 01:05 -0600
Re: Python usage numbers Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-02-12 09:12 +0000
Re: Python usage numbers Andrew Berg <bahamutzero8825@gmail.com> - 2012-02-12 05:11 -0600
Re: Python usage numbers Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-02-12 22:30 +0000
Re: Python usage numbers Dave Angel <d@davea.name> - 2012-02-12 17:50 -0500
Re: Python usage numbers Peter Pearson <ppearson@nowhere.invalid> - 2012-02-12 17:58 +0000
Re: Python usage numbers Rick Johnson <rantingrickjohnson@gmail.com> - 2012-02-12 20:48 -0800
Re: Python usage numbers Chris Angelico <rosuav@gmail.com> - 2012-02-13 16:03 +1100
OT: Entitlements [was Re: Python usage numbers] Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-02-13 08:05 +0000
Re: OT: Entitlements [was Re: Python usage numbers] Rick Johnson <rantingrickjohnson@gmail.com> - 2012-02-13 08:01 -0800
Re: OT: Entitlements [was Re: Python usage numbers] Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-02-13 16:12 +0000
Re: OT: Entitlements [was Re: Python usage numbers] Rick Johnson <rantingrickjohnson@gmail.com> - 2012-02-13 08:27 -0800
Re: OT: Entitlements [was Re: Python usage numbers] Ian Kelly <ian.g.kelly@gmail.com> - 2012-02-13 11:38 -0700
Re: OT: Entitlements [was Re: Python usage numbers] Rick Johnson <rantingrickjohnson@gmail.com> - 2012-02-13 13:01 -0800
Re: OT: Entitlements [was Re: Python usage numbers] Chris Angelico <rosuav@gmail.com> - 2012-02-14 08:27 +1100
Re: OT: Entitlements [was Re: Python usage numbers] Mark Lawrence <breamoreboy@yahoo.co.uk> - 2012-02-13 21:46 +0000
Re: OT: Entitlements [was Re: Python usage numbers] Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-02-14 00:19 +0000
Re: OT: Entitlements [was Re: Python usage numbers] Rick Johnson <rantingrickjohnson@gmail.com> - 2012-02-13 17:07 -0800
Re: OT: Entitlements [was Re: Python usage numbers] Ian Kelly <ian.g.kelly@gmail.com> - 2012-02-13 18:29 -0700
Re: OT: Entitlements [was Re: Python usage numbers] Rick Johnson <rantingrickjohnson@gmail.com> - 2012-02-17 17:13 -0800
Re: OT: Entitlements [was Re: Python usage numbers] Chris Angelico <rosuav@gmail.com> - 2012-02-18 13:13 +1100
Re: OT: Entitlements [was Re: Python usage numbers] Mark Lawrence <breamoreboy@yahoo.co.uk> - 2012-02-18 02:39 +0000
Re: OT: Entitlements [was Re: Python usage numbers] Ian Kelly <ian.g.kelly@gmail.com> - 2012-02-18 00:28 -0700
Re: OT: Entitlements [was Re: Python usage numbers] Rick Johnson <rantingrickjohnson@gmail.com> - 2012-02-18 07:02 -0800
Re: OT: Entitlements [was Re: Python usage numbers] Mark Lawrence <breamoreboy@yahoo.co.uk> - 2012-02-18 16:15 +0000
Re: OT: Entitlements [was Re: Python usage numbers] Rick Johnson <rantingrickjohnson@gmail.com> - 2012-02-18 10:34 -0800
Re: OT: Entitlements [was Re: Python usage numbers] random joe <pywin32@gmail.com> - 2012-02-18 10:49 -0800
Re: OT: Entitlements [was Re: Python usage numbers] Albert van der Horst <albert@spenarnc.xs4all.nl> - 2012-02-26 12:14 +0000
Re: OT: Entitlements [was Re: Python usage numbers] Terry Reedy <tjreedy@udel.edu> - 2012-02-18 04:16 -0500
Re: OT: Entitlements [was Re: Python usage numbers] John O'Hagan <research@johnohagan.com> - 2012-02-14 19:41 +1100
Re: OT: Entitlements [was Re: Python usage numbers] Rick Johnson <rantingrickjohnson@gmail.com> - 2012-02-14 16:21 -0800
Re: OT: Entitlements [was Re: Python usage numbers] Chris Angelico <rosuav@gmail.com> - 2012-02-15 11:44 +1100
Re: OT: Entitlements [was Re: Python usage numbers] Rick Johnson <rantingrickjohnson@gmail.com> - 2012-02-14 17:26 -0800
Re: OT: Entitlements [was Re: Python usage numbers] John O'Hagan <research@johnohagan.com> - 2012-02-15 19:56 +1100
Re: OT: Entitlements [was Re: Python usage numbers] Rick Johnson <rantingrickjohnson@gmail.com> - 2012-02-15 07:04 -0800
Re: OT: Entitlements [was Re: Python usage numbers] Mark Lawrence <breamoreboy@yahoo.co.uk> - 2012-02-15 15:18 +0000
Re: OT: Entitlements [was Re: Python usage numbers] Rick Johnson <rantingrickjohnson@gmail.com> - 2012-02-15 08:27 -0800
Re: OT: Entitlements [was Re: Python usage numbers] Mark Lawrence <breamoreboy@yahoo.co.uk> - 2012-02-15 17:16 +0000
Re: OT: Entitlements [was Re: Python usage numbers] Ian Kelly <ian.g.kelly@gmail.com> - 2012-02-15 09:46 -0700
Re: OT: Entitlements [was Re: Python usage numbers] Albert van der Horst <albert@spenarnc.xs4all.nl> - 2012-02-26 12:44 +0000
Re: OT: Entitlements [was Re: Python usage numbers] Rick Johnson <rantingrickjohnson@gmail.com> - 2012-02-26 12:35 -0800
Re: OT: Entitlements [was Re: Python usage numbers] Chris Angelico <rosuav@gmail.com> - 2012-02-27 07:50 +1100
Re: OT: Entitlements [was Re: Python usage numbers] Rick Johnson <rantingrickjohnson@gmail.com> - 2012-02-26 14:32 -0800
Re: OT: Entitlements Ben Finney <ben+python@benfinney.id.au> - 2012-02-27 07:46 +1100
Re: OT: Entitlements [was Re: Python usage numbers] Chris Angelico <rosuav@gmail.com> - 2012-02-14 07:47 +1100
Re: OT: Entitlements [was Re: Python usage numbers] Michael Torrie <torriem@gmail.com> - 2012-02-13 14:46 -0700
Re: OT: Entitlements [was Re: Python usage numbers] Rick Johnson <rantingrickjohnson@gmail.com> - 2012-02-13 16:39 -0800
Re: OT: Entitlements [was Re: Python usage numbers] Michael Torrie <torriem@gmail.com> - 2012-02-13 18:36 -0700
Re: OT: Entitlements [was Re: Python usage numbers] Chris Angelico <rosuav@gmail.com> - 2012-02-14 12:37 +1100
Re: OT: Entitlements [was Re: Python usage numbers] Rick Johnson <rantingrickjohnson@gmail.com> - 2012-02-17 17:37 -0800
Re: OT: Entitlements [was Re: Python usage numbers] Tim Wintle <tim.wintle@teamrubber.com> - 2012-02-13 16:41 +0000
Re: OT: Entitlements [was Re: Python usage numbers] Rick Johnson <rantingrickjohnson@gmail.com> - 2012-02-14 16:40 -0800
RE: OT: Entitlements [was Re: Python usage numbers] "Prasad, Ramit" <ramit.prasad@jpmorgan.com> - 2012-02-17 20:09 +0000
Re: OT: Entitlements [was Re: Python usage numbers] Duncan Booth <duncan.booth@invalid.invalid> - 2012-02-14 11:31 +0000
Re: OT: Entitlements [was Re: Python usage numbers] Devin Jeanpierre <jeanpierreda@gmail.com> - 2012-02-14 07:06 -0500
Re: OT: Entitlements [was Re: Python usage numbers] Rick Johnson <rantingrickjohnson@gmail.com> - 2012-02-14 16:48 -0800
Re: OT: Entitlements [was Re: Python usage numbers] Chris Angelico <rosuav@gmail.com> - 2012-02-15 12:32 +1100
Re: OT: Entitlements [was Re: Python usage numbers] Duncan Booth <duncan.booth@invalid.invalid> - 2012-02-15 09:47 +0000
Re: OT: Entitlements [was Re: Python usage numbers] Arnaud Delobelle <arnodel@gmail.com> - 2012-02-15 09:58 +0000
Re: OT: Entitlements [was Re: Python usage numbers] Duncan Booth <duncan.booth@invalid.invalid> - 2012-02-15 10:04 +0000
Kill files [was Re: OT: Entitlements [was Re: Python usage numbers]] Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-02-15 10:27 +0000
Re: Kill files [was Re: OT: Entitlements [was Re: Python usage numbers]] Ethan Furman <ethan@stoneleaf.us> - 2012-02-15 11:29 -0800
Re: OT: Entitlements [was Re: Python usage numbers] rusi <rustompmody@gmail.com> - 2012-02-14 04:56 -0800
Re: OT: Entitlements [was Re: Python usage numbers] Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2012-02-14 09:37 -0500
Re: Python usage numbers Matej Cepl <mcepl@redhat.com> - 2012-02-12 09:14 +0100
Re: Python usage numbers Matej Cepl <mcepl@redhat.com> - 2012-02-12 09:26 +0100
Re: Python usage numbers Mark Lawrence <breamoreboy@yahoo.co.uk> - 2012-02-12 12:11 +0000
Re: Python usage numbers alister <alister.ware@ntlworld.com> - 2012-02-12 18:55 +0000
Re: Python usage numbers jmfauth <wxjmfauth@gmail.com> - 2012-02-12 11:52 -0800
French and IDLE on Windows (was Re: Python usage numbers) Terry Reedy <tjreedy@udel.edu> - 2012-02-12 18:30 -0500
Re: Python usage numbers Anssi Saari <as@sci.fi> - 2012-02-15 11:56 +0200
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