Person.py

# -*- coding: utf-8 -*-
class Person:
    def __init__(self, name):
        self.__name = name
        self.__partner = None

    def getName(self): return self.__name

    def __str__(self):
        return self.__name + "<" + (self.__partner.getName() if self.__partner else "None") + ">"

    def marry(self, partner):
        u""" 結婚 """
        if self.__partner: return
        self.__partner = partner
        partner.marry(self)
            
    def divorce(self):
        u""" 離婚 """
        if not self.__partner: return
        partner = self.__partner
        self.__partner = None
        partner.divorce()

tarou  = Person("Tarou")
hanako = Person("Hanako")

# 結婚
tarou.marry(hanako)
print tarou, hanako  #=> Tarou:Hanako Hanako:Tarou

# 離婚
hanako.divorce()
print tarou, hanako  #=> Tarou:None Hanako:None