heapq.nl原始sequen中返回结果的最大索引

Question

如何返回iterable的第n个最大项的原始列表中的索引

heapq.nlargest(2, [100, 2, 400, 500, 400])

output = [(3,500), (2, 400)]

这已经花了我几个小时。我想不通。

Answer 1

>>> seq = [100, 2, 400, 500, 400]
>>> heapq.nlargest(2, enumerate(seq), key=lambda x: x[1])
[(3, 500), (2, 400)]

Answer 2

您可以将^{}与^{}结合使用，这对于小的n来说很快（注意list.index返回值为x的第一个项列表中的索引）：

>>> iterable = [100, 2, 400, 500, 400]
>>> map(iterable.index, heapq.nlargest(2, iterable))
[3, 2]

要查看关联的值。。。

>>> map(lambda n: (n, iterable.index(n)), heapq.nlargest(2, iterable))
[(500, 3), (400, 2)]

有关更大的n请参阅@silenghost的帖子。

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编辑：对一些解决方案进行基准测试：

#!/usr/bin/env python
import heapq
from timeit import Timer

seq = [100, 2, 400, 500, 400]

def a(seq):
    """returns [(3, 500), (2, 400)]"""
    return heapq.nlargest(2, enumerate(seq), key=lambda x: x[1])

def b(seq):
    """returns [3, 2]"""
    return map(seq.index, heapq.nlargest(2, seq))

def c(seq):
    """returns [(500, 3), (400, 2)]"""
    map(lambda n: (n, seq.index(n)), heapq.nlargest(2, seq))

if __name__ == '__main__':
    _a = Timer("a(seq)", "from __main__ import a, seq")
    _b = Timer("b(seq)", "from __main__ import b, seq")
    _c = Timer("c(seq)", "from __main__ import c, seq") 

    loops = 1000000

    print _a.timeit(number=loops)
    print _b.timeit(number=loops)
    print _c.timeit(number=loops)

    # Core i5, 2.4GHz, Python 2.6, Darwin
    # 8.92712688446
    # 5.64332985878
    # 6.50824809074