#Python program to find the highest 3 values in a dictionary 
import sys 
from heapq import nlargest 
my_dict = {'a':500, 'b':5874. 'c':560, 'd':400, 'e':5874, 'f':20}
three_largest = nlargest(3, my_dict, key-my_dict.get)
print(three_largest)
