[Python-Dev] Python and the Unicode Character Database

[Michael Foord]

On 28/11/2010 23:59, "Martin v. Löwis" wrote:
>> FWIW the C# equivalent is locale aware *unless* you pass in a specific
>> culture.
>> (System.Double.Parse):
> That's not quite the equivalent of float(), I would say: this one
> apparently is locale-aware, so it is more the equivalent of locale.atof.

Right. It is *the* standard way of getting a float from a string though, 
whereas in Python we have two depending on whether or not you want to be 
locale aware. The standard way in C# is locale aware. To be non-locale 
aware you pass in a specific culture or number format.

> The next question then is if it supports indo-arabic digits in any
> locale (or more specifically in an arabic locale).

I don't think so actually. The float parse formatting rules are defined 
like this:

     
[ws][$][sign][integral-digits[,]]integral-digits[.[fractional-digits]][E[sign]exponential-digits][ws] 


(From http://msdn.microsoft.com/en-us/library/7yd1h1be.aspx )

integral-digits, fractional-digits and exponential-digits are all 
defined as "A series of digits ranging from 0 to 9". Arguably this is 
not be conclusive. In fact the NumberFormatInfo class seems to hint that 
it may be otherwise:

http://msdn.microsoft.com/en-us/library/system.globalization.numberformatinfo.aspx

See DigitSubstitution on that page. I would have to try it to be sure 
and I don't have a Windows VM in convenient reach right now.

All the best,

Michael

> Regards,
> Martin


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