pyprocessing and exceptions

Jesse Noller jnoller at
Thu Apr 16 03:17:27 CEST 2009

On Wed, Apr 15, 2009 at 11:32 AM, garyrob <garyrob at> wrote:
> Hi,
> We're still using Python 2.5 so this question is about the
> pyprocessing module rather than the multiprocessing module, but I'm
> guessing the answer is the same.
> I tend to use the Pool() object to create slave processes. If
> something goes wrong in the slave, an exception is raised there, which
> is then raised in the master or parent process, which is great.
> The problem is that if the master aborts due to the exception, it
> doesn't show the usual stack trace info for the slave, which would
> show (among other things) the line number the error occurred on.
> Instead, it shows the line in the master where work was sent to the
> slave (such as a call to
> I'm wondering what the recommended way is to write code that will
> reveal what went wrong in the slave. One obvious possibility is to
> have functions that are invoked in the slave incorporate their own
> exception handling that prints a stack trace. But I'd rather handle
> this issue in the master, rather than have to handle it in every
> function in the slave module that the master may invoke.
> Is there a way to do that? If not, what's the recommended approach?
> Thanks,
> Gary
> --

You should handle the exception in the child.

Also, multiprocessing was backported to python 2.5 and earlier.


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