Newbie lambda question

[Windspar]

lambda are simple functions
code equal to

pairs = [(1, 'one'), (2, 'two'), (3, 'three'), (4, 'four')]
def pair_sort(pair):
	return pair[1] # this point to second object in list (1, 'one')[1] == 'one' 

pairs.sort(key=pair_sort)
print(pairs)