def run1(self):
delay = self.run0()<EOL>if delay is None:<EOL><INDENT>return False<EOL><DEDENT>if delay > <NUM_LIT:0>:<EOL><INDENT>self.clock.sleep(delay)<EOL><DEDENT>return True<EOL>
Run one item (a callback or an RPC wait_any) or sleep.

        Returns:
          True if something happened; False if all queues are empty.