def get_outputs(self):
end_p = [p for p in self.postorder() if not self.incoming_edges(p)]<EOL>self.log.debug('<STR_LIT>' % (repr(self), end_p))<EOL>return end_p<EOL>
Returns ``Piper`` instances, which are outputs to the pipeline i.e. have
no outgoing pipes (incoming dependency edges).