[Python-Dev] Catch SIGINT at Python startup

[Guido van Rossum]

On Mon, Mar 8, 2010 at 2:01 PM, Victor Stinner
<victor.stinner at haypocalc.com> wrote:
> Le lundi 08 mars 2010 22:06:36, vous avez écrit :
>> OTOH I think the try/except in site.py around the execution of
>> sitecustomize.py might be changed so that it prints a full traceback
>> whenever it raises an exception other than ImportError or, again,
>> exceptions inheriting from BaseException but not from Exception. IOW I
>> think that exceptions coming out of sitecustomize.py should continued
>> to be treated non-fatally, apart from ^C and friends, but I think that
>> exceptions coming out of site.py *might* be considered more fatally
>> once the change to exceptions coming out of sitecustomize.py is made.
>
> Do you mean something like the following code?
> ----------------------
> def execsitecustomize():
>    """Run custom site specific code, if available."""
>    try:
>        import sitecustomize
>    except ImportError:
>        pass
>    except Exception:
>        if sys.flags.verbose:
>            sys.excepthook(*sys.exc_info())
>        else:
>            print >>sys.stderr, "'import sitecustomize' failed; use -v for
> traceback"
>
> def execusercustomize():
>    """Run custom user specific code, if available."""
>    try:
>        import usercustomize
>    except ImportError:
>        pass
>    except Exception:
>        if sys.flags.verbose:
>            sys.excepthook(*sys.exc_info())
>        else:
>            print >>sys.stderr, "'import usercustomize' failed; use -v for
> traceback"
> ----------------------

Yes, roughly.

> Using these functions, even if sitecustomize fails, usercustomize is imported.

Until 5 minutes ago I didn't even know we had usercustomize. :-)

> Can it be a problem? Does usercustomize requires that sitecustomize has been
> initialized correctly?

I don't know, but if it is, execsitecustomize() could return a flag to
be checked by the code that calls execusercustomize().

> (The code can be changed to only import usercustomize if sitecutomize succeed
> or failed with an ImportError, but not if it fails with a different error)

Right. It doesn't strike me as a big deal either way.

-- 
--Guido van Rossum (python.org/~guido)