# Question: how to sort based on the length of the second element in a list?
>>> def lenOfSecondItem (item):
...     return len(item[1])
>>> l = [ [1, [3, 3, 3]], [3, [1]], [2, [2, 2]]]
>>> l
[[1, [3, 3, 3]], [3, [1]], [2, [2, 2]]]
>>> sorted(l, key=lenOfSecondItem)
[[3, [1]], [2, [2, 2]], [1, [3, 3, 3]]]