import math

class Circle:

    def __init__(self, radius):
        self.radius = radius

    def get_area(self):
        return math.pi * self.radius ** 2  

    def get_perimeter(self):
        return 2 * math.pi * self.radius
	

my_circle = Circle(4)
print("Radius before change: ", my_circle.radius)
my_circle.radius = "www"
print("Radius after change: ", my_circle.radius)