设计一个Circle(圆)类，包括圆心位置`,半径，颜色等属性。编写构造方法和其他方法， 计算周长和面积。请编写程序验证类的功能。

class Circle:
    def __init__(self, x=0, y=0, radius=0, color='black'):
        self.x = x
        self.y = y
        self.radius = radius
        self.color = color
    
    def get_area(self):
        return 3.14 * self.radius ** 2
    
    def get_perimeter(self):
        return 2 * 3.14 * self.radius
    
    def __str__(self):
        return f"Circle with center at ({self.x}, {self.y}), radius {self.radius}, color {self.color}"

测试代码：

c1 = Circle(0, 0, 5, 'red')
print(c1)
print('Area:', c1.get_area())
print('Perimeter:', c1.get_perimeter())

c2 = Circle(3, 4, 2)
print(c2)
print('Area:', c2.get_area())
print('Perimeter:', c2.get_perimeter())

输出结果：

Circle with center at (0, 0), radius 5, color red
Area: 78.5
Perimeter: 31.400000000000002
Circle with center at (3, 4), radius 2, color black
Area: 12.56
Perimeter: 12.56