Chapter 20 Classes¶

In [1]:

# 01 클래스(Class)의 기초

class Car(object):
    pass

In [2]:

# 02 클래스(class)의 인스턴스(instance) 생성

class Car(object):
    pass

my_car = Car()

In [3]:

# 03 클래스 맴버 변수(Class member variables)

class Car(object):
    condition = "new"

my_car = Car()

In [4]:

# 04 클래스 맴버 변수(Class member variables) 호출하기

class Car(object):
    condition = "new"

my_car = Car()
print (my_car.condition)

new

In [5]:

# 05 클래스(Class) 초기화하기

class Car(object):
    condition = "new"
    
    def __init__(self, model, color, mpg):
        self.model = model
        self.color = color
        self.mpg = mpg

my_car = Car("DeLorean", "silver", 88)
print (my_car.condition)

new

In [6]:

# 06 맴버 변수(member variables) 참조하기

class Car(object):
    condition = "new"
    
    def __init__(self, model, color, mpg):
        self.model = model
        self.color = color
        self.mpg = mpg

my_car = Car("DeLorean", "silver", 88)

print (my_car.condition)
print (my_car.model)
print (my_car.color)
print (my_car.mpg)

new
DeLorean
silver
88

In [7]:

# 07 클래스 메소드(method) 생성하기

class Car(object):
    condition = "new"
    def __init__(self, model, color, mpg):
        self.model = model
        self.color = color
        self.mpg   = mpg
    
    def display_car(self):
        return "This is a %s %s with %s MPG." % (self.color, self.model, self.mpg)

my_car = Car("DeLorean", "silver", 88)
print (my_car.display_car())

This is a silver DeLorean with 88 MPG.

In [8]:

# 08 맴버 변수(member variables) 수정하기

class Car(object):
    condition = "new"
    def __init__(self, model, color, mpg):
        self.model = model
        self.color = color
        self.mpg   = mpg
    
    def display_car(self):
        return "This is a %s %s with %s MPG." % (self.color, self.model, self.mpg)
    
    def drive_car(self):
        self.condition = "used"

my_car = Car("DeLorean", "silver", 88)

print (my_car.condition)

my_car.drive_car()

print (my_car.condition)

new
used

In [9]:

# 09 상속(Inheritance)

class Car(object):
    condition = "new"
    def __init__(self, model, color, mpg):
        self.model = model
        self.color = color
        self.mpg   = mpg
    
    def display_car(self):
        return "This is a %s %s with %s MPG." % (self.color, self.model, self.mpg)
    
    def drive_car(self):
        self.condition = "used"

class ElectricCar(Car):
    def __init__(self, battery_type, model, color, mpg):
        self.battery_type = battery_type
        self.model = model
        self.color = color
        self.mpg = mpg

my_car = ElectricCar("molten salt", "DeLorean", "silver", 88)

In [10]:

# 10 메소드 오버라이드 (Overriding Methods)

class Car(object):
    condition = "new"
    def __init__(self, model, color, mpg):
        self.model = model
        self.color = color
        self.mpg   = mpg
    
    def display_car(self):
        return "This is a %s %s with %s MPG." % (self.color, self.model, self.mpg)
    
    def drive_car(self):
        self.condition = "used"

class ElectricCar(Car):
    def __init__(self, battery_type, model, color, mpg):
        self.battery_type = battery_type
        self.model = model
        self.color = color
        self.mpg = mpg
    
    def drive_car(self):
        self.condition = "like new"

my_car = ElectricCar("molten salt", "DeLorean", "silver", 88)

print (my_car.condition)

my_car.drive_car()

print (my_car.condition)

new
like new

In [11]:

# 11 유용한 클래스(Classes) 만들기

class Point3D(object):
    def __init__(self, x, y, z):
        self.x = x
        self.y = y
        self.z = z
    
    def __repr__(self):
        return "(%s, %s, %s)" % (self.x, self.y, self.z)

my_point = Point3D(1, 2, 3)
print (my_point)

(1, 2, 3)