Grouping Python tuple list

Question

I have a list of (label, count) tuples like this:

[(\'grape\', 100), (\'grape\', 3), (\'apple\', 15), (\'apple\', 10), (\'apple\', 4), (\'banana\', 3)]
         


        

Answer 1

my version without itertools
[(k, sum([y for (x,y) in l if x == k])) for k in dict(l).keys()]