Re: [xml] using "raise" in Python error handler callbacks

[Stefan Seefeld <seefeld sympatico ca>]

Daniel Veillard wrote:
> On Thu, Mar 31, 2005 at 10:25:41PM +0100, Andrew McDermott wrote:
>
> > Whilst experimenting with the Python bindings I noticed that exceptions 
> > are not propagated when using registerErrorHandler().  If I run the 
> > following I get the error message:
> >
> > 	/etc/passwd : failed to parse.
> >
> > However, there is no Traceback for the "raise".  Is this correct?
> >
> > import libxml2
> > import sys
>
>
>   You have
>     Python calling C calling Python.
> the internal exception in the callback does not cross the C boundary
> I don't see how this could work without disastrous side effects like
> memory leaks or general instability in the program.

I don't think this is quite accurate. Think about python as a high-level
API to a C runtime. If the outer and the inner python runtimes are
the same, there is certainly a way to pass the necessary information through
(i.e. ultimately just preserve the exception state from the callback).

Regards,
		Stefan