# Tuples as return values

def f(r): """ Return (circumference, area) of a circle of radius r """ c = 2 * math.pi * r a = math.pi * r * r return (c, a)

**Here is what the above code is Doing:**

1. The function f is defined.

2. The function f takes one argument, r.

3. The function f returns a tuple of two values.

4. The function f computes the circumference and area of a circle of radius r.