Getting Started
with Python

class Person(object):
    "Your basic person object"

    def __init__(self, first_name, last_name):
        self.first_name, self.last_name = first_name, last_name
    def __repr__(self):
        return "Person(first_name=%s, last_name=%s)" % (
            self.first_name, self.last_name)

def Roster(persons_set):
    "Return a list of person objects, sorted by last name"

    def last_name(person):
        return person.last_name
    return sorted(people, key=last_name)

members = set()
members.add(Person('John', 'Smith'))
members.add(Person('Michelle', 'Javez'))

print Roster(members)