full_traceback.py

def full_traceback(callable, *args, **kwargs):
    """Work around the wretched exception reporting of concurrent.futures.

    Futures generally gives no access to the traceback of the task; you get
    only a traceback into the guts of futures, plus the description line of
    the task's traceback. We jam the full traceback of any exception that
    occurs into the message of the exception: disgusting but informative.

    """
    try:
        return callable(*args, **kwargs)
    except Exception:
        raise Exception(format_exc())

Example use:

pool.submit(some_function, some, args)

…becomes…

pool.submit(full_traceback, some_function, some, args)