8000 Add examples of multiple inheritance, ABCs, and interfaces. All these… · DORELAS/complete-python-course@936afaa · GitHub
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Add examples of multiple inheritance, ABCs, and interfaces. All these are used together for the same thing: ensuring a class has particular functionality that another class defines.
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‎section16/sample_code/1-multiple-inheritance/admin.py

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from user import User
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from saveable import Saveable
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class Admin(User, Saveable):
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def __init__(self, username, password, access):
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super(Admin, self).__init__(username, password)
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self.access = access
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def __repr__(self):
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return f'<Admin {self.username}, access {self.access}>'
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def to_dict(self):
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return {
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'username': self.username,
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'password': self.password,
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'access': self.access
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}

‎section16/sample_code/1-multiple-inheritance/app.py

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from database import Database
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from admin import Admin
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a = Admin('paco', 'perez', 2)
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b = Admin('rolf', 'smith', 1)
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a.save()
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b.save()
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user = Database.find(lambda x: x['username'] == 'paco')[0]
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user_obj = Admin(**user)
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print(user_obj.username)

‎section16/sample_code/1-multiple-inheritance/database.py

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class Database:
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content = {'users': []}
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@classmethod
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def insert(cls, data):
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cls.content['users'].append(data)
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@classmethod
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def remove(cls, finder):
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cls.content['users'] = [user for user in cls.content['users'] if not finder(user)]
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@classmethod
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def find(cls, finder):
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return [user for user in cls.content['users'] if finder(user)]

‎section16/sample_code/1-multiple-inheritance/saveable.py

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from database import Database
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class Saveable:
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def save(self):
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Database.insert(self.to_dict())

‎section16/sample_code/1-multiple-inheritance/user.py

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class User:
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def __init__(self, username, password):
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self.username = username
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self.password = password
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def login(self):
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return 'Logged in!'
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def __repr__(self):
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return f'<User {self.username}>'

‎section16/sample_code/2-abc/animal.py

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from abc import ABCMeta, abstractmethod
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class Animal(metaclass=ABCMeta):
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def walk(self):
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print('Walking...')
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def eat(self):
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print('Eating...')
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@abstractmethod
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def num_legs():
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pass

‎section16/sample_code/2-abc/app.py

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from animal import Animal
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from dog import Dog
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d = Dog('Bob')
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# a = Animal()
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d.walk()

‎section16/sample_code/2-abc/dog.py

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from animal import Animal
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class Dog(Animal):
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def __init__(self, name):
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self.name = name
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def num_legs(self):
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return 4

‎section16/sample_code/3-abc-2/animal.py

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from abc import ABCMeta, abstractmethod
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class Animal(metaclass=ABCMeta):
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def __init__(self, name):
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self.name = name
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def walk(self):
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print('Walking...')
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def eat(self):
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print('Eating...')
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@abstractmethod
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def num_legs():
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pass

‎section16/sample_code/3-abc-2/app.py

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from dog import Dog
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from monkey import Monkey
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d = Dog('Bob')
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m = Monkey('Rolf')
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d.walk()
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m.eat()

‎section16/sample_code/3-abc-2/dog.py

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from animal import Animal
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class Dog(Animal):
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def num_legs(self):
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return 4

‎section16/sample_code/3-abc-2/monkey.py

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from animal import Animal
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class Monkey(Animal):
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def num_legs(self):
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return 2

‎section16/sample_code/4-abc-3-and-interfaces/admin.py

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from user import User
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class Admin(User):
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def __init__(self, username, password, access):
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super(Admin, self).__init__(username, password)
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self.access = access
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def __repr__(self):
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return f'<Admin {self.username}, access {self.access}>'
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def to_dict(self):
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return {
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'username': self.username,
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'password': self.password,
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'access': self.access
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}

‎section16/sample_code/4-abc-3-and-interfaces/app.py

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from database import Database
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from admin import Admin
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a = Admin('paco', 'perez', 2)
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b = Admin('rolf', 'smith', 1)
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a.save()
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b.save()
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user = Database.find(lambda x: x['username'] == 'paco')[0]
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user_obj = Admin(**user)
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print(user_obj.username)

‎section16/sample_code/4-abc-3-and-interfaces/database.py

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class Database:
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content = {'users': []}
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@classmethod
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def insert(cls, data):
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cls.content['users'].append(data)
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@classmethod
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def remove(cls, finder):
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cls.content['users'] = [user for user in cls.content['users'] if not finder(user)]
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@classmethod
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def find(cls, finder):
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return [user for user in cls.content['users'] if finder(user)]

‎section16/sample_code/4-abc-3-and-interfaces/saveable.py

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from abc import ABCMeta, abstractmethod
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from database import Database
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class Saveable(metaclass=ABCMeta):
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def save(self):
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Database.insert(self.to_dict())
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@abstractmethod
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def to_dict():
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pass

‎section16/sample_code/4-abc-3-and-interfaces/user.py

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from saveable import Saveable
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class User(Saveable):
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def __init__(self, username, password):
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self.username = username
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self.password = password
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def login(self):
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return 'Logged in!'
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def __repr__(self):
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return f'<User {self.username}>'
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def to_dict(self):
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return {
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'username': self.username,
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'password': self.password
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}

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