return values for exceptions

[holger krekel]

N. Thomas wrote:
> I notice that user defined Python exceptions always return a value of 1 to
> the shell. I'd like to return different values in my program, depending on
> the exception, is there any way to do this?
> 
> I suppose that I could trap the exception, and then return a value based on
> that, but I'm not too sure if that is the right way to go about doing it.

IMO it's quite right.  You could also derive from SystemExit:

>>> class MyEx(SystemExit):
        pass

>>> raise MyEx(12)   # this cleanly exists
$ echo $?
12

regards,
    
    holger