"Kirk Bailey" <[EMAIL PROTECTED]> wrote
> Try:
> filename=sys.arv[1]
> except Exception, e:
This still doesn't help for the problem where a
different exception is raised.It really does need to be
try: filename = sys.argv[1]:
except IndexError:
> if filename='':
> filename='foo' # define a default value
> else:
> if foo: # detect one likely error
> foobarcode
> else:
This is invalid syntax it would need to be a chain of if/elif/else
> another idea is simply detect that there IS a argument;
>
> if sys.argv[1];
> filename=sys.argv[1]
> ...
> which avoids try altogether. Somehow I kinda like this way more.
This would still throw an exception if argv[1] doesn't exist
because the code still tries to access non existent data.
You cannot get away without using the try/except here
unless you check the length of argv:
if len(sys.argv) > 1:
filename = sys.argv[1]
Now you can check whether filename is valid or not.
HTH,
--
Alan Gauld
Author of the Learn to Program web site
http://www.freenetpages.co.uk/hp/alan.gauld
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