17.5.py

#coding:utf-8

from __future__ import print_function, division


class Kangaroo:
    
    """
    A Kangaroo is a marsupial.
    """

    def __init__(self, name, contents=[]):
        """
        Initialize the pouch contents.
        name: string
        contents: initial pouch contents.
        """
        self.name = name
        self.pouch_contents = contents

    def __init__(self, name, contents=None):
        """
        Initialize the pouch contents.
        name: string
        contents: initial pouch contents.
        """
        self.name = name
        if contents == None:
            contents = []
        self.pouch_contents = contents

    def __str__(self):
        """
        Return a string representaion of this Kangaroo.
        """
        t = [self.name + ' has pouch contents:']
        for obj in self.pouch_contents:
            s = '    ' + object.__str__(obj)
            t.append(s)
        return '\n'.join(t)

    def put_in_pouch(self, item):
        """
        Adds a new item to the pouch contents.
        item: object to be added
        """
        self.pouch_contents.append(item)


kanga = Kangaroo('Kanga')
roo = Kangaroo('Roo')
kanga.put_in_pouch('wallet')
kanga.put_in_pouch('car keys')
kanga.put_in_pouch(roo)

print(kanga)
print(roo)