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get key by value in dictionary
list = {'george':16,'amber':19}
search_age = raw_input("Provide age")
for age in list.values():
    if age == search_age:
        name = list[age]
        print name

for name, age in list.iteritems():
    if age == search_age:
        print name

for name, age in mydict.items():
    if age == search_age:
        print name

{16: 'george', 19: 'amber'}

mydict[search_age]

[name for name, age in mydict.items() if age == search_age]

next((name for name, age in mydict.items() if age == search_age), None)