user.py

from collections import namedtuple
from datetime import date

# Here's a user defined using the usual "OO" style.
class UserClass:
    def __init__(self, first, last, birthday):
        self.__first = first
        self.__last = last
        self.__birthday = birthday

    def name(self):
        return self.__first + " " + self.__last

    def age(self):
        return date.today() - self.__birthday

# Here's an "object" with identical external semantics defined using a
# namedtuple (basically a struct) and a closure.
User = namedtuple("User", ["name", "age"])

def newUser(first, last, birthday):
    return User(
        name=lambda: first + " " + last,
        age=lambda: date.today() - birthday)

# Instantiate one of each, with identical syntax other than the name of the
# class vs. instantiating function.
class_john = UserClass("John", "Coltrane", date(1926, 9, 23))
struct_john = newUser("John", "Coltrane", date(1926, 9, 23))

# Print ages and names, again with identical syntax; these will be identical.
print(class_john.name())
print(struct_john.name())

print(class_john.age())
print(struct_john.age())