[IPython-user] IPython Color help on windows cmd shell
Wed Mar 7 03:47:50 CST 2007
Jörgen Stenarson schrieb:
> Thomas Heller skrev:
>> Robert Kern schrieb:
>>> Fernando Perez wrote:
>>>> On 3/2/07, Thomas Heller <firstname.lastname@example.org> wrote:
>>>>> In : class X(object):
>>>>> ...: u"the doc string"
>>>>> In : x = X()
>>>>> In : x??
>>>>> T y p eX B a s e C < c l a s s ' _ _ mS t r i n g < _ _ m a i n _ _ . X o b j e cN a m e s pI n t e r a D o c s
>>>>> t r i n g [ s o u r c e f t h e d o
>>>> Mmh, very odd. I don't see that at all under Linux:
>>>> I know so little about windows that I honestly don't have a clue as to
>>>> what the problem could be. Any suggestions?
>>> Various (GUI terminal, font) combinations, on all platforms, want to render
>>> "Unicode" characters as double-width.
>> Yes, and pyreadline/console.py should convert unicode to byte strings before
>> rendering them. There are two possibilities to fix this with ctypes:
>> - The first one is to explicitely convert unicode strings. The attached patch
>> does that for the WriteConsoleA function.
>> - The second one is to let ctypes do it automatically by setting the .argtypes
>> attribute on the functions that need to handle text; in this case ctypes
>> automatically convert unicode/byte strings.
> I think two issues more must be considered here.
These are valid points, imo.
> What should happen if the encoding does not work? Should offending
> characters be rendered as ? or should pyreadline raise an exception?
> What do you think?
In interactive mode, rendering them as ? is probably the best that can be done.
> The second issue is which encoding should be used? I not sure mbcs is
> the best, as I understand things it is connected to the filesystem
> encoding and not the encoding used by the console. These are in general
> not the same. For me (using a swedish windows machine) the default
> codepage for a console is cp850, though I usually use 1252.
Sure. Probably one should use sys.stdout.encoding:
Python 2.4.4 (#71, Oct 18 2006, 08:34:43) [MSC v.1310 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import sys
Hm, I forgot to mention a third possibility, which would hopefully also
solve all the issues mentioned above: Why not use WriteConsoleW instead
of WriteConsoleA when a unicode string has to be printed? This way no
conversion at all would be needed.
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