2.6 and sys.exit()

hetchkay hetchkay at gmail.com
Fri Nov 13 06:28:04 CET 2009

On Nov 13, 9:50 am, John Yeung <gallium.arsen... at gmail.com> wrote:
> On Nov 12, 11:22 pm, r <rt8... at gmail.com> wrote:
> > On Nov 12, 10:07 pm, hetchkay <hetch... at gmail.com> wrote:
> > > I have the following in exit.py:
> > > import sys
> > > sys.exit(0)
> > > I now try 'python -i exit.py':
> > > In 2.5, the script exits as I would expect.
> > > In 2.6, the following error is printed:
> > > Traceback (most recent call last):
> > >   File "exit.py", line 2, in <module>
> > >     sys.exit(0)
> > > SystemExit: 0
> > > I couldn't find anything related to this in "What's new in 2.6".
> > Look here ;-)
> >http://docs.python.org/library/exceptions.html#exceptions.SystemExit
> How does that answer the OP's question?  Namely, how to make 2.6
> behave like 2.5?  (Even saying "You can't make 2.6 behave like 2.5"
> would have been a better answer.)
> Failing that, how about something that explains why 2.6 behaves
> differently than 2.5, and why one of them is better or more correct
> than the other?
> Personally, I think 2.6's is probably the more correct behavior.
> Specifically, if the point of the -i command line option is to force
> interactive mode after completion of the script (which in this case
> completed with sys.exit), then it should go to interactive mode
> regardless of whether the script terminates "normally" or not.  I
> think 2.5's behavior of allowing interactive mode to be skipped is
> against the spirit of -i.  Unless -i meant something different in 2.5.
> Is there some kind of environment variable to set up to control this?
> John

I can understand the behavior from a '-i' point of view. My
requirement is somewhat different. Consider a geometry tool that can
be used to create objects, merge objects etc. I have python 'commands'
for doing any of these operations and for saving the objects to a
file. The user could write a file containing a set of commands (in
python format) and load this file in the GUI. Optionally, one of the
commands could be to exit in which case the GUI should shut down. I am
using 'execfile' to execute the file, and this does not exit if the
user has used sys.exit (or even if I expose a command called 'Exit'
which calls sys.exit).

May be I should not be using execfile but I am not sure what else I
should use. The user-written file could contain loops and other
constructs as well.


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