python list

Question

hi

how can i sum second elements of indexes that have same first element in this list?

initial list = [['p2', 0], ['p1', 0], ['p3', 0], ['p2', 4], ['p4', 6]]

result = [['p2', 4], ['p1', 0], ['p3', 0], ['p4', 6]]

Answer 1

https://code.sololearn.com/czqioZTpidPu/?ref=app

Answer 2

https://code.sololearn.com/c2p20Kq9XkUd/?ref=app