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






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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