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Wed May 6 12:22:50 CEST 2009 · https://mail.python.org/pipermail/python-dev/2009-May/089437.html

2009/5/6 Antoine Pitrou <solipsis at pitrou.net>:
> By the way, what are the ASCII characters that are not suppported by Shift-JIS?
> Not many I suppose? (if I read the Wikipedia entry correctly, it's only the
> backslash and the tilde).

The biggest problem with Shift-JIS is that a perfectly valid unicode
character above 127 can be encoded to a byte sequence that includes
bytes in range(128).

E.g. the character 掛 (a.k.a. '\u639b') when encoded with Shift-JIS
becomes the two bytes sequence b'\x8a|'. Notice that the second byte
is 124, which on POSIX is usually interpreted as the pipe character
and can have security implications.

It's a know problem with Shift-JIS and was fixed in UTF-8.

-- 
Lino Mastrodomenico

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[Python-Dev] PEP 383 update: utf8b is now the error handler