如何在python heapq中使用lambda? [英] How to use lambdas in python heapq?

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].

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