如何在python heapq中使用lambda?

本文介绍了如何在python heapq中使用lambda?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

在python heapq中，如果要放入对象，如何使用lambda指定其键?就像heapq.heappush(Q, v, key=lambda x: f(x)).

In python heapq if you are putting in objects, how can u use a lambda to specify its key? Like heapq.heappush(Q, v, key=lambda x: f(x)).

谢谢

推荐答案

您不能.或更确切地说，您不能将其指定为lambda.但是，您可以创建一个元组heapq.heappush(Q, (key(v), v))和heapq.heappop(Q)[1]的堆.

You can't. Or rather, you can't specify it as a lambda. You can however make a heap of tuples, heapq.heappush(Q, (key(v), v)) and heapq.heappop(Q)[1].