exception handling

[Peter Otten]

Mage wrote:

> def error_msg(msg):
>     sys.exit(msg)
> 
> try:
>     do_something()
>     if value != my_wish:
>        error_msg('Invalid input')
> except:
>     print "Fatal IO or Network error"
> 
> This doesn't work because sys.exit raises an exception.
> 
> I know that I can define exception types after except, but there might
> be many. Also I know I can write:
> except:
>     if str(sys.exc_info()[0]) == 'exceptions.SystemExit':
>         raise
> 
> But honestly I would like simething like that:
> 
> except (!SystemExit):
> 
> Is this possible somehow?

try:
    # may raise any exception
except SystemExit:
    raise # propagate SystemExit (and subclasses)
except:
    # handle everything else

Peter