python dict, find value closest to x -

-

say have dict :

d = {'a': 8.25, 'c': 2.87, 'b': 1.28, 'e': 12.49}

and have value 

v = 3.19

i want :

x = "the key value closest v"

which result in 

x = 'c'

any hints on how approach this?

use min(iter, key=...)

target = 3.19 key, value = min(dict.items(), key=lambda (_, v): abs(v - target))

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