[dictionary] how to get key by item

[Egor Bolonev]

saluton al ciuj

i know how to get item by key

==================
dict = {10 : 50, 2 : 12, 4 : 43}

print dict[2]

12

but i wonder how to get key by item

print dict[12]

2

==================

is there a more fast way than that one (my dictionary is really big)
==================
dict = {10 : 50, 2 : 12, 4 : 43}
item = 12
for key in dict.keys():
    if dict[key] == item:
        print key
        break
==================
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