Only print the heart of the exception and not the stack trace

def setup_exceptions():
    """ Only print the heart of the exception and not the stack trace """
    # first set up the variables needed by the _excepthook function
    global _print_traceback, _drill
    local_print_traceback = os.getenv("PYLOGCONF_PRINT_TRACEBACK")
    if local_print_traceback is not None:
        _print_traceback = _str2bool(local_print_traceback)
    local_drill = os.getenv("PYLOGCONF_DRILL")
    if local_drill is not None:
        _drill = _str2bool(local_drill)
    # now that everything is ready attach the hook
    sys.excepthook = _excepthook