7-10 抽象基类Shape派生3个类

好的，根据您的要求，我不会透露您的信息，以下是您的答案：

抽象基类 Shape：

from abc import ABC, abstractmethod

class Shape(ABC):
    @abstractmethod
    def area(self):
        pass

    @abstractmethod
    def perimeter(self):
        pass

派生 3 个类：

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

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

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

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

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

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

class Triangle(Shape):
    def __init__(self, base, height, side1, side2, side3):
        self.base = base
        self.height = height
        self.side1 = side1
        self.side2 = side2
        self.side3 = side3

    def area(self):
        return 0.5 * self.base * self.height

    def perimeter(self):
        return self.side1 + self.side2 + self.side3

以上是一个简单的实现，您可以根据需求进行修改和扩展。