请编写一个python程序，定义一个形状类，包含属性-形状名、面积、周长，除初始化方法外，定义方法-算面积，算周长。然后，定义三个子类，三角形、矩形、圆形，分别重写算面积、算周长的方法。最后，定义相应子类的对象来验证类是否成功定义。

当然，这是一个简单的Python程序示例，展示了如何创建一个基础形状类和它的几个子类：

class Shape:
    def init(self, name):
        self.name = name
        self.area = None
        self.perimeter = None
# 定义通用的方法计算面积和周长
def calculate_area(self):
    raise NotImplementedError("Subclasses must implement this method")

def calculate_perimeter(self):
    raise NotImplementedError("Subclasses must implement this method")
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class Triangle(Shape):
    def init(self, base, height):
        super().init("Triangle")
        self.base = base
        self.height = height
def calculate_area(self):
    return 0.5 * self.base * self.height

def calculate_perimeter(self):
    return self.base + self.height
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class Rectangle(Shape):
    def init(self, length, width):
        super().init("Rectangle")
        self.length = length
        self.width = width
def calculate_area(self):
    return self.length * self.width

def calculate_perimeter(self):
    return 2 * (self.length + self.width)
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class Circle(Shape):
    def init(self, radius):
        super().init("Circle")
        self.radius = radius
def calculate_area(self):
    return 3.14159 * (self.radius ** 2)

def calculate_perimeter(self):
    return 2 * 3.14159 * self.radius
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测试和验证子类
triangle = Triangle(3, 4)
print(f"Triangle area: {triangle.calculate_area()}")
print(f"Triangle perimeter: {triangle.calculate_perimeter()}")
rectangle = Rectangle(5, 6)
print(f"Rectangle area: {rectangle.calculate_area()}")
print(f"Rectangle perimeter: {rectangle.calculate_perimeter()}")
circle = Circle(2)
print(f"Circular area: {circle.calculate_area()}")
print(f"Circular perimeter: {circle.calculate_perimeter()}")