Use a class variable to define the value of a constant PI. # Python Program to find Area Of Circle using Radius PI = 3.14 radius = float(input(' Please Enter the radius of a circle: ')) area = PI * radius * radius circumference = 2 * PI * radius print(" Area Of a Circle = %.2f" %area) print(" Circumference Of a Circle = %.2f" %circumference) There are several common ways to use doctest: To check that a module’s docstrings are up-to-date by verifying that all interactive examples still work as documented. pi * r * r print ("Area of the circle is : %.2f" % area) a. radius must be The triangle class is a subclass of polygon class. method. Python Program to find Area Of a Triangle: If we know length of 3 sides, we can find area of a triangle using Heron's Formula: Area = √(s*(s-a)*(s-b)*(s-c)) Python Hello World Program Python add 2 numbers Program NOTES: In Python 2, you need to write "class Circle(object):" to create a so-called new-style class by Assume that the center point is stored in the variables xc and yc, and the perimeter point is in xp and yp. I think a smart developer should get familiar doctest , unittest , pytest , and nose. We(me and my wife) have one Youtube channel. Testing Python-Programs with or without special modules like unit-Test and doctest We can see that the functions make only sense, if the input consists of positive integers. The doctest module searches for pieces of text that look like interactive Python sessions, and then executes those sessions to verify that they work exactly as shown. Let’s find the area of a circle using the math module of python : Here, we have imported the ‘math’ module and use the value of math.pi for π. The Doctest Module finds patterns in the docstring that looks like interactive shell commands. As an example, we’ll write a function that takes two points, the center of the circle and a point on the perimeter, and computes the area of the circle. I will show you both of these ways to calculate the area. edit close. It’s is a fairly well known python unit test framework, and can run doctests, unittests, and “no boilerplate” tests. 3. Constants like ‘pi’, ‘e’, ‘tau’, ‘inf’ and ‘nan’ are also defined inside this module. Python: Area of a Circle In geometry, the area enclosed by a circle of radius r is πr2. So in the above example, the length of the side of the square is about 6cm, so the area of the square is 6x6 = 36cm^2, so the area of the circle is approximately 14/17 x 36 = 29.64cm^2. 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