Thank you for the reply. It happens that, as I understand it, none of
the options that you mentioned is a solution for my situation.
On Jan 29, 9:48 pm, Steven D'Aprano <[EMAIL PROTECTED]>
wrote:
> The easiest ways to fix that are:
>
> (1) subclass an exception that already knows about Unicode;
But I often raise one of Python's built-in errors. And also, is it
really true that subclassing one of Python's built-ins give me
something that is unicode deficient? I assumed that I had missed
something (because that's happened so many times before :-) ).
For instance, I write a lot of CGI and I want to wrap everything in a
try .. except.
try:
main()
except Exception, err:
print "Terrible blunder: ",str(err)
so that the err can be one of my exceptions, or can be one that came
with Python. (And, that I can see, err.args can be either the relevant
string or a tuple containing the relevant string and the documentation
is silent on whether in the built-in exceptions if err.args is a tuple
then the string is guaranteed to be first in the tuple.)
> (2) convert the file name to ASCII before you store it; or
I need the non-ascii information, though, which is why I included it
in the error message.
> (3) add a __str__ method to your exception that is Unicode aware.
I have two difficulties with this: (1) as above I often raise Python's
built-in exceptions and for those __str__() is what it is, and (2)
this goes against the meaning of __str__() that I find in the
documentation in ref/customization.html which says that the return
value must be a string object. Obviously no one will come to my house
and slap me if I violate that, but I'll venture that it would be odd
if the best practice were to be to do the opposite of the
documentation.
> I'm going to be lazy and do a real simple-minded version of (2):
>
> >>> class MyBetterException(Exception):... def __init__(self, arg):
> ... self.args = arg.encode('ascii', 'replace')
> ... self.unicode_arg = arg # save the original in case
This is illuminating. How do you know that for exceptions __init__()
should take one non-self argument? I missed finding this information.
Thanks again,
Jim
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