Python Circle Class With Getter Setter. In this Python programming tutorial we will learn about the use of Getter and Setter methods. How can we provide a getter and setter method for each variable in a Python class?

## What are Getter and Setter Methods in Python class?

A getter method is actually an Accessor Method that returns the value of an instance variable. While a Setter method is also called a Mutator method. It is used to set the value of an instance variable in a Python class.

## How to Create Circle Class?

Write a Python program to design a Circle class with radius. Define a constructor, a setter setRadius() and a getter getRadius(). Write down a method to calculate area and the other method for perimeter: findArea() and findPerimeter().

## Design the Circle Class

class Circle: ''' Circle class'''

## Define constructor for Circle Class

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

## Writing Accessor and Mutator Methods for radius of Circle

Here we will define getRadius() and setRadius() methods for the instance variable “radius”.

The getRadius () method will return the value of radius.

On the other hand we can set or change the value of radius using setRadius() method. It will take a parameter which will provide the value to the associated instance variable.

# Write getter and setter for radius def setRadius(self,radius): self.radius = radius def getRadius(self): return self.radius

## Define Methods To Calculate area and perimeter of Circle

# write findArea() and findPerimeter() def findArea(self): return math.pi * self.radius * self.radius def findPerimeter(self): return 2*math.pi*self.radius

## Source code of class Circle with Getter and Setter Methods

# Write a Python program to # design a Circle class # with radius, # constructor, # setRadius() and getRadius(), # findArea() and findPerimeter() import math class Circle: ''' Circle class''' # constructor def __init__(self, radius): self.radius = radius # Write getter and setter for radius def setRadius(self,radius): self.radius = radius def getRadius(self): return self.radius # write findArea() and findPerimeter() def findArea(self): return math.pi * self.radius * self.radius def findPerimeter(self): return 2*math.pi*self.radius # write main function def main(): # create an object c1 = Circle(4.50) # show area and perimeter ar = c1.findArea() ar = round(ar,2) pe = c1.findPerimeter() pe = round(pe,2) # get radius r = c1.getRadius() print("Circle object c1 with radius=",r) print("Area = ", ar) print("Perimeter = ",pe) # set radius / change radius c1.setRadius(9.2456) # show area and perimeter for new value of radius ar = c1.findArea() ar = round(ar,2) r = c1.getRadius() #r = round(r,2) pe = c1.findPerimeter() pe = round(pe,2) print("Circle object c1 with radius=",r) print("Area = ", ar) print("Perimeter = ",pe) # call main main()

Circle object c1 with radius= 4.5 Area = 63.62 Perimeter = 28.27 Circle object c1 with radius= 9.2456 Area = 268.55 Perimeter = 58.09 Second Execution Circle object c1 with radius= 2.54 Area = 20.27 Perimeter = 15.96 Circle object c1 with radius= 5.26 Area = 86.92 Perimeter = 33.05

## Must Read

Python Class and Objects With Code Examples

Python Create New Class Rectangle

Create a new Python Math1 Class with Parameterized Constructor

C++ Program To Calculate Area and Circumference of Circle

### Related Posts on Python OOP concepts

- Create New Java Class Calculation Add Subtract
- Creating New Box class in Java
- Define Bar Chart Class in Java Program
- Define Circle Class in Java with Radius and Area
- Create a New Java Class Rectangle – Java Program
- Design and Use Triangle Class – C++ Program
- C++ Program Temperature Conversion Using Class and Objects
- Create a new Python Math1 Class with Constructor