Recognise similar instances in array and merge them

Question

I have an array of arrays, like this...

[[\'Abradolf Lincler\', 4], [\'Abradolf Lincler\', 4], [\'Scary Terry\', 4], [\'Abradolf Lincler\', 4], [\'Scary Terry\',         


        

Answer 1

Better using setdefault:

d={}
for x,y in arrays:
   d.setdefault(x,[]).append(y)
print(list(map(list,{k:sum(v) for k,v in d.items()}.items())))

Output:

[['Abradolf Lincler', 32], ['Scary Terry', 20], ['Summer Smith', 20]]

Best in all defaultdict:

from collections import defaultdict
d=defaultdict(int)
for x,y in arrays:
   d[x]+=y
print(list(map(list,dict(d).items())))   

Output:

[['Abradolf Lincler', 32], ['Scary Terry', 20], ['Summer Smith', 20]]