#!/usr/bin/env python3

class Person():
    def __init__(self, name, age):
        self.name = name
        self.age = age

    def __repr__(self):
        return repr((self.name, self.age))

people = [
    Person("tom", 22),
    Person("jack", 11),
    Person("jerry", 33)
]

if __name__ == "__main__":
    sorted_people = sorted(people, key=lambda person: person.age)
    print(sorted_people)