radius_setter

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

    @property
    def radius(self):
        return self.__radius

    @radius.setter
    def radius(self, value):
        if value <= 0:
            raise ValueError("Value is not positive")
        self.__radius = value

    def area(self):
        return 3.14 * self.__radius * self.__radius


my_circle = Circle(5)
print("Initial radius:", my_circle.radius)

my_circle.radius = 7
print("Updated radius:", my_circle.radius)