Python でのオブジェクト指向プログラミングの一般的な問題と解決策

class Dog:
    def __init__(self, name):
        self.name = name

    def bark(self):
        print(f"{self.name} is barking")

# 创建一个Dog的实例
my_dog = Dog("Tom")
# 调用实例的方法
my_dog.bark()

class Animal:
    def __init__(self, name):
        self.name = name

    def sound(self):
        print("This animal makes a sound")

class Cat(Animal):
    def sound(self):
        print("Meow")

my_cat = Cat("Kitty")
my_cat.sound()

class Shape:
    def calculate_area(self):
        pass

class Rectangle(Shape):
    def __init__(self, width, height):
        self.width = width
        self.height = height

    def calculate_area(self):
        return self.width * self.height

class Circle(Shape):
    def __init__(self, radius):
        self.radius = radius

    def calculate_area(self):
        return 3.14 * self.radius * self.radius

def print_area(shape):
    print(f"The area is: {shape.calculate_area()}")

my_rectangle = Rectangle(2, 3)
my_circle = Circle(5)

print_area(my_rectangle)
print_area(my_circle)

class BankAccount:
    def __init__(self, balance):
        self.__balance = balance

    def deposit(self, amount):
        self.__balance += amount

    def withdraw(self, amount):
        if self.__balance >= amount:
            self.__balance -= amount
        else:
            print("Insufficient balance")

    def check_balance(self):
        print(f"Current balance: {self.__balance}")

my_account = BankAccount(1000)
my_account.deposit(500)
my_account.withdraw(200)
my_account.check_balance()