Append value to each sublist in a list

Question

I have a list of list that I want to append a constant value to each sublist of the full list, for instance:

_lst = [[1, 2], [3, 4], [5, 6]]

and I want to append 7 to each of the sublist so that _lst becomes:

[[1, 2, 7], [3, 4, 7], [5, 6, 7]]

Is there a good way to complete the job (such as using zip )? Thanks!

Answer 1

for l in _lst:
    l.append(7)

Answer 2

_lst = [ele + [7] for ele in _lst]

Answer 3

>>> tmp = [ i.append(7) for i in _lst ]
>>> print _lst
[[1, 2, 7], [3, 4, 7], [5, 6, 7]]