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Groups > comp.lang.python > #94167
| Subject | Re: Devanagari int literals [was Re: Should non-security 2.7 bugs be fixed?] |
|---|---|
| References | (5 earlier) <55ab2b57$0$1664$c3e8da3$5496439d@news.astraweb.com> <20150719075601.779a4edb@bigbox.christie.dr> <CAPTjJmoV1MV4Fyr39iYL0s0o_sXYQvZmkgrLMcDA1UfsvyFf8w@mail.gmail.com> <20150719145520.5888c9e1@bigbox.christie.dr> <CAPTjJmqN+mxwU6eSnbZZXYxSaxNZQWuj7KiZ4J4wrOaZpMa6hQ@mail.gmail.com> |
| From | MRAB <python@mrabarnett.plus.com> |
| Date | 2015-07-19 23:13 +0100 |
| Newsgroups | comp.lang.python |
| Message-ID | <mailman.746.1437344032.3674.python-list@python.org> (permalink) |
On 2015-07-19 22:16, Chris Angelico wrote:
> On Mon, Jul 20, 2015 at 5:55 AM, Tim Chase
> <python.list@tim.thechases.com> wrote:
>> On 2015-07-20 04:07, Chris Angelico wrote:
>>> The int() and float() functions accept, if I'm not mistaken,
>>> anything with Unicode category "Nd" (Number, decimal digit). In
>>> your examples, the fraction (U+215B) is No, and the Roman numerals
>>> (U+2168, U+2182) are Nl, so they're not supported. Adding support
>>> for these forms might be accepted as a feature request, but it's
>>> not a bug.
>>
>> Ah, that makes sense. Some simple testing (thanks, unicodedata
>> module) supports your conjecture.
>>
>> It's not a particularly big deal so not really worth the brain-cycles
>> to add support for them. Just upon hearing "Python's int() does
>> smart things with Unicode characters", those were some of my first
>> characters to try. The failure struck me as odd until you explained
>> the simple difference.
>
> The other part of the problem is: What should float("2⅛3") be? Should
> it be equal to 21.0/83.0? Should the first part be parsed as a classic
> mixed number (2 + 1/8), and then what should the 3 mean? While it's
> easy to see what an individual character should represent (just check
> unicodedata.numeric(ch) - for ⅛ it's 0.125), the true meaning of a
> string of such characters is less than clear. Similarly, Roman
> numerals aren't meant to be used after the decimal point, so "Ⅸ.Ⅴ"
> does not normally mean nine and a half... not to mention the confusing
> situation that "ⅠⅤ" would naively parse as 15 but "Ⅳ" is definitely 4.
> Since these kinds of complexities exist, it's safest to reserve this
> level of parsing for a special-purpose function. If someone can come
> up with a really strong argument for the float() and int()
> constructors interpreting these, I'd expect to see it deployed as a
> third-party module first, before being pointed out as "see, you can
> use float() for all these, but if you want to use those, you should
> use Float() instead". (Incidentally, I fully expect to see, some day,
> pytz.localize() semantics brought into the standard library
> datetime.datetime class, for precisely this reason.)
>
> Unicode is awesome, but it's not a panacea :)
>
What's the result of, say, float('1e.3')?
It raises an exception.
So float("2⅛3") should also raise an exception.
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Re: Should non-security 2.7 bugs be fixed? Devin Jeanpierre <jeanpierreda@gmail.com> - 2015-07-18 19:33 -0700
Re: Should non-security 2.7 bugs be fixed? Rick Johnson <rantingrickjohnson@gmail.com> - 2015-07-18 19:49 -0700
Re: Should non-security 2.7 bugs be fixed? Rustom Mody <rustompmody@gmail.com> - 2015-07-18 20:52 -0700
Re: Should non-security 2.7 bugs be fixed? Rick Johnson <rantingrickjohnson@gmail.com> - 2015-07-18 21:18 -0700
Devanagari int literals [was Re: Should non-security 2.7 bugs be fixed?] Steven D'Aprano <steve@pearwood.info> - 2015-07-19 14:45 +1000
Re: Devanagari int literals [was Re: Should non-security 2.7 bugs be fixed?] Chris Angelico <rosuav@gmail.com> - 2015-07-19 15:06 +1000
Re: Devanagari int literals [was Re: Should non-security 2.7 bugs be fixed?] Marko Rauhamaa <marko@pacujo.net> - 2015-07-19 10:16 +0300
Re: Devanagari int literals [was Re: Should non-security 2.7 bugs be fixed?] Rustom Mody <rustompmody@gmail.com> - 2015-07-19 00:32 -0700
Re: Devanagari int literals [was Re: Should non-security 2.7 bugs be fixed?] Marko Rauhamaa <marko@pacujo.net> - 2015-07-19 10:44 +0300
Re: Devanagari int literals [was Re: Should non-security 2.7 bugs be fixed?] Terry Reedy <tjreedy@udel.edu> - 2015-07-19 19:13 -0400
Re: Devanagari int literals [was Re: Should non-security 2.7 bugs be fixed?] Rustom Mody <rustompmody@gmail.com> - 2015-07-19 19:02 -0700
Re: Devanagari int literals [was Re: Should non-security 2.7 bugs be fixed?] Anuradha Laxminarayan <lanuradha@gmail.com> - 2015-07-18 23:25 -0700
Re: Devanagari int literals [was Re: Should non-security 2.7 bugs be fixed?] Terry Reedy <tjreedy@udel.edu> - 2015-07-19 04:26 -0400
Re: Devanagari int literals [was Re: Should non-security 2.7 bugs be fixed?] Tim Chase <python.list@tim.thechases.com> - 2015-07-19 07:56 -0500
Re: Devanagari int literals [was Re: Should non-security 2.7 bugs be fixed?] Chris Angelico <rosuav@gmail.com> - 2015-07-20 04:07 +1000
Re: Devanagari int literals [was Re: Should non-security 2.7 bugs be fixed?] Tim Chase <python.list@tim.thechases.com> - 2015-07-19 14:55 -0500
Re: Devanagari int literals [was Re: Should non-security 2.7 bugs be fixed?] Chris Angelico <rosuav@gmail.com> - 2015-07-20 07:16 +1000
Re: Devanagari int literals [was Re: Should non-security 2.7 bugs be fixed?] wxjmfauth@gmail.com - 2015-07-20 00:43 -0700
Re: Devanagari int literals [was Re: Should non-security 2.7 bugs be fixed?] MRAB <python@mrabarnett.plus.com> - 2015-07-19 23:13 +0100
Re: Devanagari int literals [was Re: Should non-security 2.7 bugs be fixed?] Rustom Mody <rustompmody@gmail.com> - 2015-07-20 20:30 -0700
Re: Devanagari int literals [was Re: Should non-security 2.7 bugs be fixed?] Chris Angelico <rosuav@gmail.com> - 2015-07-21 13:43 +1000
Re: Devanagari int literals [was Re: Should non-security 2.7 bugs be fixed?] Rustom Mody <rustompmody@gmail.com> - 2015-07-20 23:11 -0700
Re: Devanagari int literals [was Re: Should non-security 2.7 bugs be fixed?] Laura Creighton <lac@openend.se> - 2015-07-21 10:10 +0200
Re: Devanagari int literals [was Re: Should non-security 2.7 bugs be fixed?] Marko Rauhamaa <marko@pacujo.net> - 2015-07-21 12:10 +0300
Re: Devanagari int literals [was Re: Should non-security 2.7 bugs be fixed?] Chris Angelico <rosuav@gmail.com> - 2015-07-21 19:18 +1000
Re: Devanagari int literals [was Re: Should non-security 2.7 bugs be fixed?] Marko Rauhamaa <marko@pacujo.net> - 2015-07-21 13:13 +0300
Re: Devanagari int literals [was Re: Should non-security 2.7 bugs be fixed?] Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-07-21 11:34 +0100
Re: Devanagari int literals [was Re: Should non-security 2.7 bugs be fixed?] Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-07-21 20:39 +1000
Re: Devanagari int literals [was Re: Should non-security 2.7 bugs be fixed?] Marko Rauhamaa <marko@pacujo.net> - 2015-07-21 13:54 +0300
Re: Devanagari int literals [was Re: Should non-security 2.7 bugs be fixed?] Marko Rauhamaa <marko@pacujo.net> - 2015-08-09 00:27 +0300
Re: OT Re: Math-embarrassment results in CS [was: Should non-security 2.7 bugs be fixed?] Rustom Mody <rustompmody@gmail.com> - 2015-08-09 09:29 -0700
Re: Math-embarrassment results in CS [was: Should non-security 2.7 bugs be fixed?] Rustom Mody <rustompmody@gmail.com> - 2015-07-22 06:34 -0700
OT Re: Math-embarrassment results in CS [was: Should non-security 2.7 bugs be fixed?] Steven D'Aprano <steve@pearwood.info> - 2015-07-23 02:58 +1000
Re: OT Re: Math-embarrassment results in CS [was: Should non-security 2.7 bugs be fixed?] Laura Creighton <lac@openend.se> - 2015-07-22 19:17 +0200
Re: OT Re: Math-embarrassment results in CS [was: Should non-security 2.7 bugs be fixed?] Rustom Mody <rustompmody@gmail.com> - 2015-07-22 10:49 -0700
Re: OT Re: Math-embarrassment results in CS [was: Should non-security 2.7 bugs be fixed?] Laura Creighton <lac@openend.se> - 2015-07-22 20:14 +0200
Re: OT Re: Math-embarrassment results in CS [was: Should non-security 2.7 bugs be fixed?] Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-07-22 21:59 +0100
Re: OT Re: Math-embarrassment results in CS [was: Should non-security 2.7 bugs be fixed?] Steven D'Aprano <steve@pearwood.info> - 2015-07-23 03:21 +1000
Re: OT Re: Math-embarrassment results in CS [was: Should non-security 2.7 bugs be fixed?] Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2015-07-22 21:44 -0400
Re: OT Re: Math-embarrassment results in CS [was: Should non-security 2.7 bugs be fixed?] Chris Angelico <rosuav@gmail.com> - 2015-07-23 12:00 +1000
Re: OT Re: Math-embarrassment results in CS [was: Should non-security 2.7 bugs be fixed?] Paul Rubin <no.email@nospam.invalid> - 2015-07-22 10:48 -0700
Re: OT Re: Math-embarrassment results in CS [was: Should non-security 2.7 bugs be fixed?] Rustom Mody <rustompmody@gmail.com> - 2015-07-22 10:51 -0700
Re: OT Re: Math-embarrassment results in CS [was: Should non-security 2.7 bugs be fixed?] Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-07-23 15:14 +1000
Re: OT Re: Math-embarrassment results in CS [was: Should non-security 2.7 bugs be fixed?] Rustom Mody <rustompmody@gmail.com> - 2015-07-22 11:09 -0700
Re: OT Re: Math-embarrassment results in CS [was: Should non-security 2.7 bugs be fixed?] Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-07-23 15:41 +1000
Re: OT Re: Math-embarrassment results in CS [was: Should non-security 2.7 bugs be fixed?] Marko Rauhamaa <marko@pacujo.net> - 2015-07-23 23:59 +0300
Re: OT Re: Math-embarrassment results in CS [was: Should non-security 2.7 bugs be fixed?] Chris Angelico <rosuav@gmail.com> - 2015-07-24 07:03 +1000
Re: OT Re: Math-embarrassment results in CS [was: Should non-security 2.7 bugs be fixed?] Marko Rauhamaa <marko@pacujo.net> - 2015-07-24 00:29 +0300
Re: OT Re: Math-embarrassment results in CS [was: Should non-security 2.7 bugs be fixed?] Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-07-23 22:50 +0100
Re: OT Re: Math-embarrassment results in CS [was: Should non-security 2.7 bugs be fixed?] Laura Creighton <lac@openend.se> - 2015-07-23 23:52 +0200
Re: OT Re: Math-embarrassment results in CS [was: Should non-security 2.7 bugs be fixed?] Marko Rauhamaa <marko@pacujo.net> - 2015-07-24 00:59 +0300
Re: OT Re: Math-embarrassment results in CS [was: Should non-security 2.7 bugs be fixed?] Chris Angelico <rosuav@gmail.com> - 2015-07-24 08:02 +1000
Re: OT Re: Math-embarrassment results in CS [was: Should non-security 2.7 bugs be fixed?] Chris Angelico <rosuav@gmail.com> - 2015-07-24 08:00 +1000
Re: OT Re: Math-embarrassment results in CS [was: Should non-security 2.7 bugs be fixed?] MRAB <python@mrabarnett.plus.com> - 2015-07-23 23:01 +0100
Re: OT Re: Math-embarrassment results in CS [was: Should non-security 2.7 bugs be fixed?] Laura Creighton <lac@openend.se> - 2015-07-24 00:19 +0200
Re: OT Re: Math-embarrassment results in CS [was: Should non-security 2.7 bugs be fixed?] Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-07-23 23:56 +0100
Re: OT Re: Math-embarrassment results in CS [was: Should non-security 2.7 bugs be fixed?] Grant Edwards <invalid@invalid.invalid> - 2015-07-24 00:07 +0000
Re: OT Re: Math-embarrassment results in CS [was: Should non-security 2.7 bugs be fixed?] Rick Johnson <rantingrickjohnson@gmail.com> - 2015-07-23 18:40 -0700
Re: OT Re: Math-embarrassment results in CS [was: Should non-security 2.7 bugs be fixed?] Paul Rubin <no.email@nospam.invalid> - 2015-07-23 19:03 -0700
Re: OT Re: Math-embarrassment results in CS [was: Should non-security 2.7 bugs be fixed?] Rick Johnson <rantingrickjohnson@gmail.com> - 2015-07-23 20:16 -0700
Re: OT Re: Math-embarrassment results in CS [was: Should non-security 2.7 bugs be fixed?] Grant Edwards <invalid@invalid.invalid> - 2015-07-24 14:13 +0000
Re: OT Re: Math-embarrassment results in CS [was: Should non-security 2.7 bugs be fixed?] Paul Rubin <no.email@nospam.invalid> - 2015-07-24 08:45 -0700
Re: OT Re: Math-embarrassment results in CS [was: Should non-security 2.7 bugs be fixed?] Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-07-24 16:58 +0100
Re: OT Re: Math-embarrassment results in CS [was: Should non-security 2.7 bugs be fixed?] Rustom Mody <rustompmody@gmail.com> - 2015-07-23 22:15 -0700
Re: OT Re: Math-embarrassment results in CS [was: Should non-security 2.7 bugs be fixed?] Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2015-07-23 18:57 +1200
Re: OT Re: Math-embarrassment results in CS [was: Should non-security 2.7 bugs be fixed?] Rustom Mody <rustompmody@gmail.com> - 2015-07-23 02:12 -0700
Re: OT Re: Math-embarrassment results in CS [was: Should non-security 2.7 bugs be fixed?] Rustom Mody <rustompmody@gmail.com> - 2015-07-23 05:52 -0700
Re: OT Re: Math-embarrassment results in CS [was: Should non-security 2.7 bugs be fixed?] Marko Rauhamaa <marko@pacujo.net> - 2015-07-23 11:24 +0300
Re: Devanagari int literals [was Re: Should non-security 2.7 bugs be fixed?] Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-07-21 18:57 +1000
Re: Should non-security 2.7 bugs be fixed? Terry Reedy <tjreedy@udel.edu> - 2015-07-19 02:44 -0400
Re: Should non-security 2.7 bugs be fixed? Terry Reedy <tjreedy@udel.edu> - 2015-07-19 05:11 -0400
Re: Should non-security 2.7 bugs be fixed? Rustom Mody <rustompmody@gmail.com> - 2015-07-19 07:30 -0700
Re: Should non-security 2.7 bugs be fixed? Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-07-19 15:00 +0100
Re: Should non-security 2.7 bugs be fixed? Steven D'Aprano <steve@pearwood.info> - 2015-07-19 14:45 +1000
Re: Should non-security 2.7 bugs be fixed? Devin Jeanpierre <jeanpierreda@gmail.com> - 2015-07-19 18:20 -0700
Re: Should non-security 2.7 bugs be fixed? Steven D'Aprano <steve@pearwood.info> - 2015-07-20 13:05 +1000
Re: Should non-security 2.7 bugs be fixed? Devin Jeanpierre <jeanpierreda@gmail.com> - 2015-07-19 20:41 -0700
Re: Should non-security 2.7 bugs be fixed? Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-07-20 02:46 +0100
Re: Should non-security 2.7 bugs be fixed? Rustom Mody <rustompmody@gmail.com> - 2015-07-19 19:16 -0700
Re: Should non-security 2.7 bugs be fixed? Chris Angelico <rosuav@gmail.com> - 2015-07-20 12:59 +1000
Re: Should non-security 2.7 bugs be fixed? Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-07-20 11:59 +0100
Re: Should non-security 2.7 bugs be fixed? Rick Johnson <rantingrickjohnson@gmail.com> - 2015-07-20 20:04 -0700
Re: Should non-security 2.7 bugs be fixed? Rustom Mody <rustompmody@gmail.com> - 2015-07-20 20:15 -0700
Re: Should non-security 2.7 bugs be fixed? Chris Angelico <rosuav@gmail.com> - 2015-07-21 13:33 +1000
Re: Should non-security 2.7 bugs be fixed? Terry Reedy <tjreedy@udel.edu> - 2015-07-21 00:45 -0400
Re: Should non-security 2.7 bugs be fixed? breamoreboy@gmail.com - 2015-07-21 14:22 -0700
Re: Should non-security 2.7 bugs be fixed? Rick Johnson <rantingrickjohnson@gmail.com> - 2015-07-21 19:07 -0700
Re: Should non-security 2.7 bugs be fixed? Terry Reedy <tjreedy@udel.edu> - 2015-07-22 02:51 -0400
Re: Should non-security 2.7 bugs be fixed? Rick Johnson <rantingrickjohnson@gmail.com> - 2015-07-22 16:37 -0700
Re: Should non-security 2.7 bugs be fixed? Terry Reedy <tjreedy@udel.edu> - 2015-07-20 02:25 -0400
Re: Should non-security 2.7 bugs be fixed? dieter <dieter@handshake.de> - 2015-07-20 08:58 +0200
Re: Should non-security 2.7 bugs be fixed? Devin Jeanpierre <jeanpierreda@gmail.com> - 2015-07-20 00:13 -0700
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