Composition vs Inheritance

composition.py

# Main client class
# Makes the credentials available to the other classes
# In this scenario, User uses or has an API, but it isn't an API
# So we don't really need to inherit from the client class (Dribbble_API)


class Dribbble_API(object):
    
    def __init__(self, client_id=None, client_secret=None, access_token=None):
        self.client_id = client_id
        self.client_secret = client_secret
        self.access_token   = access_token


    def call_api(self, endpoint):
        print("{}&access_token={}".format(endpoint, self.access_token))

# Simple User class
# Does not need to inherit from the client / does not need to know about the credentials
# We just pass an instance of Dribbble_API to User, and access the properties like so 
# self.client.property

class User():
    
    def __init__(self, client):
        self.client = client
    
    def get_info(self):
        return self.client.call_api('/user')


d = Dribbble_API(client_id="my_client_id", client_secret="MyClientSecret", access_token="mysecrettoken")
u = User(d)
u.get_info() # prints /user&access_token=mysecrettoken