Python - dividing a list-of-lists to groups

Question

Consider the following simplified case:

lol = [['John','Polak',5,3,7,9],
       ['John','Polak',7,9,2,3],
       ['Mark','Eden' ,0,3,3,1],
       ['Mark','Eden' ,5,1,2,9]]

What would be a pythonic and memory+speed efficient way to transform this list-of-lists to a list-of-lists-of-lists based on the first two parameters:

lolol = [[['John','Polak',5,3,7,9],
          ['John','Polak',7,9,2,3]],
         [['Mark','Eden' ,0,3,3,1],
          ['Mark','Eden' ,5,1,2,9]]]

Actually - any other data structure would also be ok, as long as I have the correct hierarchy. For example the following dictionary structure comes to mind, but creating it doesn't seem efficient speed-efficient enough, and the memory would probably be higher than the lolol solution.

dolol = {('John','Polak'):[[5,3,7,9],[7,9,2,3]],
         ('Mark','Eden') :[[0,3,3,1],[5,1,2,9]]}

Answer 1

To complement delnan's answer with a Python 2 equivalent:

from collections import defaultdict

dolol=defaultdict(list)
for data in lol:
    dolol[data[0],data[1]].append(data[2:])