Python lists -- deduping and adding sub-list element

PK Stroh :

Input:

a = [[['a','b'],3],[['b','a'],9],[['b','z'],4]]

Desired Output (dedupe regardless of order and add integers)

[[['a','b'],12],[['b','z'],4]]

This does not work of course:

a2 = [sorted(list) for list in [i[0] for i in a]]

print(a2)

[['a', 'b'], ['a', 'b'], ['b', 'z']]

which can be deduped of course:

a3= [] 

for i in a2: 
    if i not in a3: 
       a3.append(i)

print(a3)

[['a', 'b'], ['b', 'z']]

But of course I am losing the counts for the sub-list being deduped. Any advice?
Thanks.

Eric Frigade :

I guess this is what you want:

a = [[['a','b'],3],[['b','a'],9],[['b','z'],4]]

# we use a dict to do the job.
# we sort the list of char and change to tuple. So i can be use as key.
dct = {}

for i in a:
    srt = tuple(sorted(i[0]))
    if srt in dct:
        # the tuple of char is already existing as key, just sum int.
        dct[srt]+= i[1]
    else:
        # if not we had a new key
        dct[srt] = i[1]
# Convert the dict to list of list
new_list = [[list(k),v] for k,v in dct.items()]
print(new_list) # [[['a', 'b'], 12], [['b', 'z'], 4]]

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