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Thu Sep 16 20:16:53 CEST 2010 · http://mail.python.org/pipermail/python-dev/2010-September/103738.html

On Thu, Sep 16, 2010 at 10:56:56AM -0700, Guido van Rossum wrote:
> On Thu, Sep 16, 2010 at 10:46 AM, Martin (gzlist) <gzlist at googlemail.com> wrote:
> > On 16/09/2010, Guido van Rossum <guido at python.org> wrote:
> >>
> >> In all cases I can imagine where such polymorphic functions make
> >> sense, the necessary and sufficient assumption should be that the
> >> encoding is a superset of 7-bit(*) ASCII. This includes UTF-8, all
> >> Latin-N variant, and AFAIK also the popular CJK encodings other than
> >> UTF-16. This is the same assumption made by Python's byte type when
> >> you use "character-based" methods like lower().
> >
> > Well, depends on what exactly you're doing, it's pretty easy to go wrong:
> >
> > Python 3.2a2+ (py3k, Sep 16 2010, 18:43:45) [MSC v.1500 32 bit (Intel)] on win32
> > Type "help", "copyright", "credits" or "license" for more information.
> >>>> import os, sys
> >>>> os.path.split("C:\\十")
> > ('C:\\', '十')
> >>>> os.path.split("C:\\十".encode(sys.getfilesystemencoding()))
> > (b'C:\\\x8f', b'')
> >
> > Similar things can catch out web developers once they step outside the
> > percent encoding.
> 
> Well, that character is not 7-bit ASCII. Of course things will go
> wrong there. That's the whole point of what I said, isn't it?
> 
You were talking about encodings that were supersets of 7-bit ASCII.
I think Martin was demonstrating a byte string that was a superset of 7-bit
ASCII being fed to a stdlib function which went wrong.

-Toshio
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