myprojects-hg-reborn

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#! /usr/bin/env python

"""square.py -- Make some noise about a square."""

#first I create a class rectangle

class rectangle:
	#I initialize the dimensions of the rectangle
	def __init__(self, height, width):
		self.height = height
		self.width = width
	#then I calculate its area
	def area(self):
		return self.height * self.width

#Now I define a derived class from the previous one using inheritance
#this simply returns on top of the previous stuff twice the are of the rectangle

class rect_new(rectangle): # I have to provide the name of the previous class as an
	# argument, since that is the class I want to derive from
	def double_area(self):
		return rectangle.area(self)*2. #now the new class can do anything the 
	#old one was able to do plus calculate the new area
	

my_rect=rectangle(5.,4.)
print 'the width is ', my_rect.width
print 'the height', my_rect.height
print 'the area is', my_rect.area()
# now a test on inheritance

my_rect2=rect_new(5.,4.)

print 'double area is', my_rect2.double_area()
print 'the original area calculate by the inherited class is ', my_rect2.area()