Find dictionary keys with duplicate values

Question

some_dict = {\"firstname\": \"Albert\", \"nickname\": \"Albert\", \"surname\": \"Likins\", \"username\": \"Angel\"}

I would like to return the keys

Answer 1

If your data set isn't too large, you don't need reverse multidict. You can use count on dict.values() and return the desired keys by iterating over dict.items().

desired_keys = []

vals = some_dict.values()

for key, value in some_dict.items():
   if vals.count(value) > 1:
        desired_keys.append(key)

Hope this helps!