That code as written will just use one dict_sub and keep replacing the
values in it, storing a reference to dict_sub for every dict[key]. So
I'm not surprised you're getting duplicated items. They should all be
duplicated. You can put dict_sub = {} inside the loop and it'll behave
like you expect.
If you want to do unique by the sub-items' values (and not just the
keys), how about creating the dicts like this instead? (Also, calling
it dict isn't good because it shadows the dict() function and isn't
very informative, so I'll call it marbles.)
marbles = {}
unique_values = {'subid1': {}, 'subid2': {}, 'subid3': {}}
for item in items:
# ... get item's values and key
sub = {'subid1': value1, 'subid2':, value2, 'subid3': value3}
unique = True
for k, v in sub.items():
if v in unique_values[k]:
unique = False
break
else:
unique_values[k][v] = True
if not unique:
return
marbles[key] = sub
Hope this helps.
--Nick
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