Python order list of lists of floats

Question

So if I have this list [['a', 0.1], ['b', 0.05], ['c', 1.5]]. How does one order it by the second value so that the ordered list looks like this [['b', 0.05], ['a', 0.1], ['c', 1.5]]?

Answer 1

from operator import itemgetter
list  = [['a', 0.1], ['b', 0.05], ['c', 1.5], ['d', 0.2]]
a = sorted(list, key=itemgetter(1))
print(list)
print(a)

Answer 2

You can use sorted and tell it to use the second element:

a = [['a', 0.1], ['b', 0.05], ['c', 1.5]]
print(sorted(a, key=lambda k: k[1]))

key=lambda k: k[1] tells it take the second element (k[1]) and sort based on those values.