Define key in nlargest() of heapq?

Duncan Booth duncan.booth at invalid.invalid
Tue Nov 13 09:46:23 CET 2007

Davy <zhushenli at> wrote:

> Hi all,
> I have a dictionary with n elements, and I want to get the m(m<=n)
> keys with the largest values.
> 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].
> How to do this by nlargest() of heapq? I have tried
> nlargest(2,dic,key),
> the interpreter give out:
> Traceback (most recent call last):
>   File "<interactive input>", line 1, in <module>
> NameError: name 'key' is not defined
> Best regards,
> Davy
You could use the code I posted for you yesterday. See message

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