lambda x1,x2, ... ,xn: function( x1 x2 ... xn)
for n >= 1
add = lambda x, y: x + y
print(add(3, 5))
# Output: 8
Sorting a list of 2-tuples
a = [(1, 2), (4, 1), (9, 10), (13, -3)]
a.sort(key=lambda x: x[1])
print(a)
# Output: [(13, -3), (4, 1), (1, 2), (9, 10)]
