<< Chapter < Page Chapter >> Page >
Figure 2 . Output from the code in Listing 4.
Tom Joe

Modify and then print the value in superclassVar

Finally, the code in Listing 5 uses the reference to the Subclass object to modify and then print the value stored in the class variable of the Superclass class named superclassVar .

Listing 5 . Modify and then print the value in superclassVar.
ref.superclassVar = "Sue" print(ref.superclassVar)

Figure 3 shows the output produced by executing the code in Listing 5 .

Figure 3 . Output from the code in Listing 5.
Sue

Run the program

I encourage you to copy the code from Listing 6 . Execute the code and confirm that you get the same results as those shown in Figure 4 . Experiment with the code, making changes, and observing the results of your changes. Make certain that youcan explain why your changes behave as they do.

Visualize the program

I also encourage you to create a visualization for the code in Listing 6 . Step through the program one instruction at a time. As you do that, pay attention to the movements of the red and green arrows on the left, the diagramon the right, and the printed material at the bottom. That should help you to better understand inheritance in Python.

Complete program listing

A complete listing of the program discussed in this module is provided in Listing 6 below. The output produced by the code in Listing 6 is shown in Figure 4 .

Listing 6 . Complete program listing.
# Illustrates inheritance #----------------------------------------------------------#Define the superclass class Superclass(object):superclassVar = Truedef __init__(self,name): Superclass.superclassVar = nameself.friend = "Tom" #Define a subclass that extends or inherits from Superclassclass Subclass(Superclass): def __init__(self,name):Superclass.__init__(self,name) print(self.friend)#Code that exercises the classes print(Superclass.superclassVar)ref = Subclass("Joe") print(ref.superclassVar)ref.superclassVar = "Sue" print(ref.superclassVar)
Figure 4 . Output from code in Listing 6.
True TomJoe Sue

Miscellaneous

This section contains a variety of miscellaneous information.

Housekeeping material
  • Module name: Itse1359-1450-Inheritance
  • File: Itse1359-1450.htm
  • Published: 10/27/14
  • Revised: 03/04/15
Disclaimers:

Financial : Although the Connexions site makes it possible for you to download a PDF file for thismodule at no charge, and also makes it possible for you to purchase a pre-printed version of the PDF file, you should beaware that some of the HTML elements in this module may not translate well into PDF.

I also want you to know that, I receive no financial compensation from the Connexions website even if you purchase the PDF version of the module.

In the past, unknown individuals have copied my modules from cnx.org, converted them to Kindle books, and placed them for sale on Amazon.com showing me as the author. Ineither receive compensation for those sales nor do I know who does receive compensation. If you purchase such a book, please beaware that it is a copy of a module that is freely available on cnx.org and that it was made and published withoutmy prior knowledge.

Affiliation : I : I am a professor of Computer Information Technology at Austin Community College in Austin, TX.

-end-

Questions & Answers

participants in market
LEHLOGONOLO Reply
do the negative slope of production possibility curve sloped to show trade offs in production of two goods?
Bafokeng Reply
how is economics not a science subject
Adio Reply
i need the main definition of economics
Okafor Reply
according to professor Richard lipsey economics is a social science that concerns with the way society has employ scarce productive resources in other to achieve a certain conditions of living
Confidence
what does it mean to say that market equilibrium is stable?
Ayesha Reply
what is the practical significance of cross price elasticity of demand?
Ayesha
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Azolingo Reply
what is the practical significance of cross price elasticity of demand?
Ayesha
economics is a social science that deals with human behaviour relating with end and scares means
Okafor
according to working definition of economics by professor Richard lipsey economics is a social science that concerns with the way society has choice to employ scarce productive resources in other to achieve a certain living conditions
Confidence
why is economics not a pure science?
AHUMBE Reply
it is not a pure science because it only studies human behavior
Ayaane
economics is a social science cause it is relating to ends and scares means🙂
Okafor
economics is not a pure science because it studies about human behaviour scarcity want and needs of human beings and the critical thinking of human beings it can be said not to be a pure science because it cannot be manipulated because you don't know humans minds, humans minds are unpredictable
Confidence
economics is not a pure science because it studies about human behavior scarcity want and needs of human being .and the critical thinking of human being. last science can be manipulated but economics cannot because you don't know humans minds, humans min
Confidence
what is management of human resources?
Ibrahim Reply
how is economics a science?
Mei Reply
economics is not a science subject either is a social science subject
Okafor
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Confidence
4. It is a hot day, and Bert is thirsty. Here is the value he places on each bottle of water: Value of first bottle $7 Value of second bottle $5 Value of third bottle $3 Value of fourth bottle $1 a. From this information, derive Bert’s demand schedule. Graph his demand curve for bottled w
Tahmina Reply
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Lukman
what is the law of diminishing marginal utility
Samuel Reply
The law of diminishing marginal utility state that as a consumer consumes a successive units of a commodity, a point is eventually reached where consumption of additional unit yields less satisfaction.
raheem
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Isatu Reply
other things can be equal an certain amount paid for the goods by consumer in the market called demand.
Dhanishhwar
demand is the amount of a commodity a consumer is willing and able buy at a given price at a particular point in time
Samuel
Demand is the quantity of commodity a consumer is willing and able to buy at a given price and a particular time.
raheem
demand can be defined as the willingness and ability of a consumer to purchase goods or services at a given price in a particular time
Confidence
what is economics
Owusu Reply
economics is a social science subject, which study human behaviors as a relationship btw end ND scarce means
Joseph
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Isatu
Utility is the satisfaction a consumer derives from consuming a particular commodity.
raheem
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Agyei Reply
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Owusu
what are the four basic assumptions of perfect competition
Liyanda Reply
Researchers demonstrated that the hippocampus functions in memory processing by creating lesions in the hippocampi of rats, which resulted in ________.
Mapo Reply
The formulation of new memories is sometimes called ________, and the process of bringing up old memories is called ________.
Mapo Reply
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Source:  OpenStax, Itse 1359 introduction to scripting languages: python. OpenStax CNX. Jan 22, 2016 Download for free at https://legacy.cnx.org/content/col11713/1.32
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