3.创建圆环类的对象，并输出对象的面积和周长;创建多个圆，输出总的个数，每个圆的面积周长等。

好的，我可以回答这个问题。以下是代码示例：

class Circle:
    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

# 创建圆环类的对象
circle1 = Circle(5)
circle2 = Circle(7)

# 输出对象的面积和周长
print("Circle 1 area:", circle1.area())
print("Circle 1 perimeter:", circle1.perimeter())
print("Circle 2 area:", circle2.area())
print("Circle 2 perimeter:", circle2.perimeter())

# 创建多个圆
circles = [Circle(3), Circle(4), Circle(6)]

# 输出总的个数，每个圆的面积周长等
total_circles = len(circles)
total_area = sum([circle.area() for circle in circles])
total_perimeter = sum([circle.perimeter() for circle in circles])

print("Total circles:", total_circles)
print("Total area:", total_area)
print("Total perimeter:", total_perimeter)

希望这个代码示例对你有所帮助！