How to return a list called in a class in python

Struggling with this:

Write a function called get_pets_string. get_pets_string should
have one parameter, an instance of Owner. get_pets_string
should return a list of that owner’s pets according to the
following format:

David Joyner's pets are: Boggle Joyner, Artemis Joyner

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 = []

If your function works correctly, this will originally
print:

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David Joyner's pets are: Boggle Joyner, Artemis Joyner
Audrey Hepburn's pets are: Pippin Hepburn

owner_1 = Owner(Name("David", "Joyner"))
owner_2 = Owner(Name("Audrey", "Hepburn"))

pet_1 = Pet(Name("Boggle", "Joyner"), owner_1)
pet_2 = Pet(Name("Artemis", "Joyner"), owner_1)
pet_3 = Pet(Name("Pippin", "Hepburn"), owner_2)

owner_1.pets.append(pet_1)
owner_1.pets.append(pet_2)
owner_2.pets.append(pet_3)

print(get_pets_string(owner_1))
print(get_pets_string(owner_2))

Here is my code as below:

def get_pets_string(owner):
    for obj in owner.pets:
       return owner.name.first + " " + owner.name.last + "'s pets are: " + obj.name.first + " " + obj.name.last

My answer can only print one pet for each owner like this:

David Joyner's pets are: Boggle Joyner
Audrey Hepburn's pets are: Pippin Hepburn

>Solution :

You can implement a quick helper function to change how the string is displayed and simply displaying the name:

def repr_name(name):
    return name.first + " " + name.last

Then you can display all the pets together:

def get_pets_string(owner):
   return f"{repr_name(owner.name)}'s pets are: {', '.join([repr_name(pet.name) for pet in owner.pets])}"

The ', '.join([str(pet.name) for pet in owner.pets]) puts the name of every pet into the list, and then separates each of them with commas.