adding objects to a class list, from another class in Python

Question

How could I modify the classes below so that when a new instance of Pet is created, it is automatically added to its Owner's list of pets?

class Name:
    def __init__(self, first, last):
        self.first = first
        self.last = last

class Pet:
    def __init__(self, name, owner):
        self.name = name
        self.owner = owner
        
class Owner:
    def __init__(self, name):
        self.name = name
        self.pets = []

in Pet.__init__(): self.owner.pets.append(self)

Green Cloak Guy
– Green Cloak Guy

2021-05-27 21:45:57 +00:00
Commented May 27, 2021 at 21:45 — Green Cloak Guy
– Green Cloak Guy, Commented May 27, 2021 at 21:45

Juan Andrade · Accepted Answer · 2021-05-27 21:58:57Z

2

owner1 = Owner(name="Juan")

pet = Pet(name="foo", owner=owner1)

owner1.pets += pet

or change your pet init

class Pet:
    def __init__(self, name, owner):
        self.name = name
        self.owner = owner
        owner.pets.append(self)

edited May 27, 2021 at 21:58

answered May 27, 2021 at 21:47

Juan Andrade

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5 Comments

Juan Andrade Over a year ago

Realy no, fixed!

Green Cloak Guy Over a year ago

You can't concatenate a non-iterable to a list. Change it to owner.pets += [self]

Bill Over a year ago

Or how about owner.pets.append(self)?

Juan Andrade Over a year ago

yeah, sorry, that "owner.pets.append(self)" is the correct syntax, seeing that self will be an object, and objects is not iterable

Alan Alor Over a year ago

Excellent, many thanks. The change on pet init worked perfectly!

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