On Sun, 14 Feb 2010 10:33:09 pm patrice laporte wrote:
> I got a class that takes a file name in its __init__ method (it
> could be elsewhere, but why not here ?). Then, somewhere in that
> class, a method will do something with that file name, such as "try
> to open that file".
>
> If the file do esn't exist, bing ! I got an exception "I/O Error n°2
> : file doesn't exist".
Are you sure? What version of Python are you using? I get a completely
different error message:
>>> open("no such file.txt", "r")
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
IOError: [Errno 2] No such file or directory: 'no such file.txt'
Note carefully that the exception shows you the file name.
> That's nice, I of course catch this exception, but it's not enough
> for the user : What file are we talking about ? And how to tell the
> user what is that file, and make him understand he tell the app to
> use a file that doesn't exist ?
>>> try:
... open("no such file.txt", "r")
... except IOError, e:
... pass
...
>>> e.filename
'no such file.txt'
> And this is not enough for developer : where that error happened ?
> what class ? what method ?
All these things are displayed by the default traceback mechanism.
--
Steven D'Aprano
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