Class

# 클래스 생성자 / 소멸자
class Person(object):
    def __init__(self, name):
        self.name = name

    def __del__(self):
        print('good bye')

    def say(self):
        print('hello')
        self.run(2)

    def run(self, num):
        print('run' * num)


person = Person('Mike')
person.say()


# del 을 사용하면 강제로 소멸자가 호출되게 할 수 있다.
del person


####################################################################
# 클래스 상속
class Car(object):
    def __init__(self, model=None):
        self.model = model

    def run(self):
        print('run')


class Toyota(Car):
    def run(self):
        print('fast')


class Tesla(Car):
    def __init__(self, model='Model S', enable_auto_run=False):
        super().__init__(model)
        self._enable_auto_run = enable_auto_run

    # enable_auto_run 을 readonly 로 만들기
    @property
    def enable_auto_run(self):
        return self._enable_auto_run

    def run(self):
        print('super fast')

    def auto_run(self):
        print('auto run')


car = Car()
car.run()

toyota = Toyota('Lexus')
toyota.run()

tesla = Tesla('Model S')
tesla.run()
tesla.auto_run()

# enable_auto_run 은 readonly
tesla.enable_auto_run = True  # AttributeError: can't set attribute 'enable_auto_run'

####################################################################
# abstract class
import abc


# abc.ABC 를 상속받아 생성: Person 객체를 직접 생성 불가능하게 함
class Person(abc.ABC):
    def __init__(self, age=1):
        self.age = age

    @abc.abstractmethod
    def drive(self):
        pass


class Adult(Person):
    def drive(self):
        print("ok")


person = Adult()
person.drive()


####################################################################
# 다중 상속

class A(object):
    def talk(self):
        print('talk')

    def run(self):
        print('A run')


class B(object):
    def run(self):
        print('B run')


class AB(A, B):
    def fly(self):
        print('fly')


ab = AB()
# AB(A, B) 로 정의되어 있을 경우 A 에 있는 method 를 사용한다.
ab.run()  # A run
ab.fly()  # fly


####################################################################
# 클래스 변수

class Book(object):
    # 모든 클래스 오브젝트들이 공유
    kind = 'comic'

    def __init__(self, name) -> None:
        self.name = name

    def info(self):
        print(self.kind, self.name)


book = Book('Dragon Ball')
book.info()  # comic Dragon Ball


####################################################################
# class method / static method

class Circle(object):
    kind = 'plane'

    def __init__(self, r):
        self.x = r

    # 주로 factory method 로 활용
    @classmethod
    def default_circle(cls):
        return cls(100)

    @staticmethod
    def about(radius):
        print(f'about circle: {radius}')


a = Circle(9)
print(a.kind)  # plane
print(a.x)  # 9

b = Circle.default_circle()
print(b.x)  # 100

print(Circle.kind)  # plane
print(Circle.x) # AttributeError: type object 'Circle' has no attribute 'x'
print(Circle.about(3))  # about circle: 3


####################################################################
# 특수 메소드

class Word(object):
    def __init__(self, text):
        self.text = text

    # str()
    def __str__(self):
        return 'Word!!!!'

    # len()
    def __len__(self):
        return len(self.text)

    # +
    def __add__(self, word):
        return self.text.lower() + word.text.lower()

    # ==
    def __eq__(self, word):
        return self.text.lower() == word.text.lower()