Python program to find the area and circumference of Circle Problem Definition: Write a python program that has a class named Circle. Use a class variable to define the value of a constant PI. Our program will take the radius as an input from the user, calculate the area and print it on the console. Here the Greek letter π represents a constant, approximately equal to 3.14159, which is equal to the ratio of the circumference of any circle to its diameter. View unittest.txt from COMPUTER 132 at Oracle Charter School. 1. 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Define the test method of 'test_creating_circle_with_numerical_radius' which creates circle with radius 2.5 and check if radius matches to value 2.5 Define the test method test_creating_circle_with_negative_radius which checks if value error exception is raised with the error message "radius must be between 0 and 1000 inclusive", while creating circle of radius 2.5. Python Constants like ‘pi’, ‘e’, ‘tau’, ‘inf’ and ‘nan’ are also defined inside this module. nose also supplies a number of helpful functions for writing timed tests, testing for exceptions, and other common use cases. As we already know that the def keyword is used to define a normal function in Python. Area = pi * r 2 where r is radius of circle . This Python program allows the user to enter three sides of the triangle. Write Python Program to find Volume and Surface Area of a Cylinder with example. They do not represent actual code, but rather ways in which we can organize our code for the optimum results. 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