Stan Stan - 4 months ago 7
Python Question

How to sort (list/tuple) of lists/tuples?

I have some data either in list contains lists, or list contains tuples.

data = [[1,2,3], [4,5,6], [7,8,9]]
data = [(1,2,3), (4,5,6), (7,8,9)]


And I want to sort by the 2nd element in the subset. Meaning, sorting by 2,5,8 where 2 is from (1,2,3), 5 is from (4,5,6). What is the common way to do this? Should I store tuples or lists in my list? Since tuples are more inflexible. Thanks.

Answer
sorted_by_second = sorted(data, key=lambda tup: tup[1])

or:

data.sort(key=lambda tup: tup[1])  # sorts in place