How to get a set of keys with largest values?

[Davy]

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].

Is there any fast way to implement this algorithm?
Any suggestions are welcome!

Best regards,
Davy