Derived class inheriting from a base class.

 

import math

class Point:
   def __init__( self, xValue = 0, yValue = 0 ):
      self.x = xValue
      self.y = yValue

class Circle( Point ):
   def __init__( self, x = 0, y = 0, radiusValue = 0.0 ):
      Point.__init__( self, x, y )
      self.radius = float( radiusValue )

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

print "Point bases:", Point.__bases__
print "Circle bases:", Circle.__bases__


print "\nCircle is a subclass of Point:", issubclass( Circle, Point )
print "Point is a subclass of Circle:", issubclass( Point, Circle )

point = Point( 30, 50 ) 
circle = Circle( 120, 89, 2.7 )   

print "\ncircle is a Point object:", isinstance( circle, Point )
print "point is a Circle object:", isinstance( point, Circle )

print "\npoint members:\n\t", point.__dict__
print "circle members:\n\t", circle.__dict__

print "\nArea of circle:", circle.area()

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3.	Class inherited
4.	Inherited method
5.	Polymorphism: override the function from base class
6.	Definition and test function for class Circle which is based on Point class
7.	Multiple Inheritance
8.	inheriting from multiple superclasses
9.	Use Inheritance to add more features to a class
10.	class extending dict type
11.	Class inheritance: inherit member variable override function

Derived class inheriting from a base class. : Class Inheritance « Class « Python

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