'Display the message on stout or stderr depending on verbosity'

def _print(self, msg, msg_args):

    if (not self.verbose):
        return
    if (self.verbose < 50):
        writer = sys.stderr.write
    else:
        writer = sys.stdout.write
    msg = (msg % msg_args)
    writer(('[%s]:    %s\n' % (self, msg)))
