你能帮我理解一个实际例子中的抽象类与接口的用法吗？

from abc import ABC, abstractmethod

class Shape(ABC):
    def __init__(self, color, x, y):
        self.color = color
        self.x = x
        self.y = y

    @abstractmethod
    def area(self):
        pass

    @abstractmethod
    def perimeter(self):
        pass

class Rectangle(Shape):
    def __init__(self, color, x, y, width, height):
        super().__init__(color, x, y)
        self.width = width
        self.height = height

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

    def perimeter(self):
        return 2 * (self.width + self.height)

class Circle(Shape):
    def __init__(self, color, x, y, radius):
        super().__init__(color, x, y)
        self.radius = radius

    def area(self):
        return 3.14 * self.radius ** 2

    def perimeter(self):
        return 2 * 3.14 * self.radius

class AreaCalculator:
    @staticmethod
    def calculate_area(shape):
        return shape.area()

rectangle = Rectangle("red", 0, 0, 10, 20)
area = AreaCalculator.calculate_area(rectangle)
print(f"The area of the rectangle is {area}")