在Python中的元组列表中找到最大值 [英] Find the maximum value in a list of tuples in Python

问题描述

可能重复:
排序或查找最大值嵌套列表中第二个元素的值. Python

Possible Duplicate:
Sorting or Finding Max Value by the second element in a nested list. Python

我有一个包含〜10 ^ 6个元组的列表，如下所示:

I have a list with ~10^6 tuples in it like this:

[(101, 153), (255, 827), (361, 961), ...]
  ^     ^
  X     Y

我想在此列表中找到Y的最大值，但也想知道绑定到的X.

I want to find the maximum value of the Ys in this list, but also want to know the X that it is bound to.

我该怎么做?

推荐答案

使用max():

使用itemgetter():

In [53]: lis=[(101, 153), (255, 827), (361, 961)]

In [81]: from operator import itemgetter

In [82]: max(lis,key=itemgetter(1))[0]    #faster solution
Out[82]: 361

使用lambda:

In [54]: max(lis,key=lambda item:item[1])
Out[54]: (361, 961)

In [55]: max(lis,key=lambda item:item[1])[0]
Out[55]: 361

timeit比较:

In [30]: %timeit max(lis,key=itemgetter(1))
1000 loops, best of 3: 232 us per loop

In [31]: %timeit max(lis,key=lambda item:item[1])
1000 loops, best of 3: 556 us per loop

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