Polymorphism in Python

Author: Deepali-Srivastava

lectures-code/polymorphism-1.py

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+# Copyright (C) Deepali Srivastava - All Rights Reserved
+# This code is part of Python course available on CourseGalaxy.com
+
+class Car:
+   def start(self):
+       print('Engine started')
+   def move(self):
+       print('Car is running')
+   def stop(self):
+       print('Brakes applied')
+      
+class Clock:
+   def move(self):
+       print('Tick Tick Tick')
+   def stop(self):
+       print('Clock needles stopped')
+
+
+class Person:
+    def move(self):
+        print('Person walking')
+      
+    def stop(self):
+        print('Taking rest')
+
+    def talk(self):
+        print('Hello')
+
+car = Car()
+clock = Clock()
+person = Person()
+
+def do_something(x):
+   x.move()
+   x.stop()
+
+do_something(car)
+do_something(clock)
+do_something(person)
+ 

lectures-code/polymorphism-2.py

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+# Copyright (C) Deepali Srivastava - All Rights Reserved
+# This code is part of Python course available on CourseGalaxy.com
+
+class Rectangle: 
+    name = 'Rectangle'
+    def __init__(self, length, breadth):
+        self.length = length
+        self.breadth =  breadth
+
+    def area(self):
+        return self.length * self.breadth
+
+    def perimeter(self):
+        return 2 * (self.length + self.breadth)
+
+class Triangle:
+    name = 'Triangle'
+    def __init__(self, s1, s2, s3):
+        self.s1 = s1
+        self.s2 = s2
+        self.s3 = s3
+
+    def area(self):
+        sp = (self.s1 + self.s2 + self.s3) / 2
+        return ( sp*(sp-self.s1)*(sp-self.s2)*(sp-self.s3) ) ** 0.5
+
+    def perimeter(self):
+        return self.s1 + self.s2 + self.s3
+
+class Circle:
+    name = 'Circle'
+    def __init__(self, radius):
+        self.radius = radius
+        
+    def area(self):
+        return 3.14 * self.radius * self.radius
+
+    def perimeter(self):
+        return 2 * 3.14 * self.radius
+
+r1 = Rectangle(13,25)
+r2 = Rectangle(14,16)
+t1 = Triangle(14,17,12)
+t2 = Triangle(25,33,52)
+c1 = Circle(14)
+c2 = Circle(25)
+
+def find_area_perimeter(shape):    
+    print(shape.name)
+    print('Area : ', shape.area() ) 
+    print('Perimeter : ', shape.perimeter() )
+
+find_area_perimeter(t2)
+find_area_perimeter(c1)
+find_area_perimeter(r2)
+
+shapes = [r1,r2,t1,t2,c1,c2]
+
+total_area = 0
+total_perimeter = 0
+
+for shape in shapes:
+    total_area += shape.area()
+    total_perimeter += shape.perimeter()
+
+print(total_area, total_perimeter)
+