Posted By: Anonymous
I have a list of lists:
[[12, 'tall', 'blue', 1], [2, 'short', 'red', 9], [4, 'tall', 'blue', 13]]
If I wanted to sort by one element, say the tall/short element, I could do it via
s = sorted(s, key = itemgetter(1)).
If I wanted to sort by both tall/short and colour, I could do the sort twice, once for each element, but is there a quicker way?
A key can be a function that returns a tuple:
s = sorted(s, key = lambda x: (x, x))
Or you can achieve the same using
itemgetter (which is faster and avoids a Python function call):
import operator s = sorted(s, key = operator.itemgetter(1, 2))
And notice that here you can use
sort instead of using
sorted and then reassigning:
s.sort(key = operator.itemgetter(1, 2))