How to get a set of keys with largest values?

[Duncan Booth]

Davy <zhushenli at gmail.com> wrote:

> For example, I have dic that includes n=4 elements, I want m=2 keys
> have the largest values)
> dic = {0:4,3:1,5:2,7:8}
> So, the the largest values are [8,4], so the keys are [7,0].
> 
> Is there any fast way to implement this algorithm?
> Any suggestions are welcome!
> 

Don't implement it: just use it.

>>> dic = {0:4,3:1,5:2,7:8}
>>> from heapq import nlargest
>>> nlargest(2, dic, key=dic.__getitem__)
[7, 0]
>>>