On 06/16/2010 10:10 PM, Stuart McGraw wrote:
> I am having a problem with exceptions and unicode.
>
> try: open ('file.txt')
> except IOError, e: pass
> str (e)
> => "[Errno 2] No such file or directory: 'file.txt'"
>
> which is fine but...
>
> try: open (u'フィイル.txt')
> except IOError, e: pass
> str (e)
> => "[Errno 2] No such file or directory:
> u'\\u30d5\\u30a3\\u30a4\\u30eb.txt'"
>
> ok, I did ask for a str string so no reason I should expect a unicode
> string, but then (in Python 2.6)...
>
> unicode (e)
> => u"(2, 'No such file or directory')"
>
> i.e. no formatting at all, or in Python 2.6.5
>
> unicode (e)
> => u"[Errno 2] No such file or directory:
> u'\\u30d5\\u30a3\\u30a4\\u30eb.txt'"
it looks like IOError simply calls repr(self.filename) to create an
error message.
e.filename is, however, still a unicode object, so you could access that
directly, and format it yourself. A simple approach to get the same
message would be
u"[Errno {0.errno}] {0.strerror}: '{0.filename}'".format(e)
but it looks like the standard exceptions use repr (barely surprising),
and in Python 2, repr is as much of a arse about unicode as the rest of
the language.
> (Python 3.x is not an option.)
If it were, it'd be a good one though ;-)
> Note that the exceptions may be anything (I just used IOError
> as an example) and are generated in bowels of an API that I
> can't/won't mess with.
Yeah, well, you'd have to special-case every single exception type that
gets unicode arguments, as they probably all treat them in the same
ungrateful way.
Thomas
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