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This module is one in a collection of modules on Python designed for teaching ITSE 1359 Introduction to Scripting Languages: Python at Austin Community College in Austin, TX.
This module contains review questions and answers keyed to the module titled Itse1359-1430-Instance Variables .
Once you study that module, you should be able to answer the review questions in this module.
The questions and the answers in this module are connected by hyperlinks to make it easy for you to navigate from the question to the answer and back again.
(Note to blind and visually impaired students: with the exception of two bitmap images that are used solely as spacers to separate the questionsection from the answer section, all of the material in this module is presented in plain text format and should be accessible using an audio screen reader or abraille display. Note however that the required indentation may not be properly represented by an audio screen reader.)
True or False? The code in Figure 1 produces the output shown in Figure 2 .
| Figure 1 . Question 1 program code. |
|---|
class TestClass(object):
def __init__(self,data):self.iVar01 = datadef addInstanceVar(self,data):
self.iVar02 = dataref01 = TestClass("ABCD")
ref02 = TestClass("DEFG")print(ref01.iVar01)
print(ref02.iVar01)ref01.addInstanceVar(1234)
print(ref01.iVar02)print(ref02.iVar02) |
| Figure 2 . Question 1 possible output. |
|---|
ABCD
DEFG1234
1234 |
Go to answer 1
What is the meaning of the following two images?
These images were inserted here simply to insert some space between the questions and the answers to keep them from being visible on the screen at thesame time.
This image was also inserted for the purpose of inserting space between the questions and the answers.
False. The actual output is shown in Figure 3 . Adding a new instance variable to an object at runtime does not add that instance variable to all objects thathave been instantiated from the same class.
| Figure 3 . Question 1 actual output. |
|---|
ABCD
DEFG1234
Traceback (most recent call last):File "1359-1430r-01.py", line 20, in<module>print(ref02.iVar02)
AttributeError: 'TestClass' object has no attribute 'iVar02' |
Go back to Question 1
This section contains a variety of miscellaneous information.
Financial : Although the Connexions site makes it possible for you to download aPDF file for this module at no charge, and also makes it possible for you to purchase a pre-printed version of the PDF file, youshould be aware 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 ofthe module.
In the past, unknown individuals have copied my modules from cnx.org, converted them to Kindle books, and placed them for sale onAmazon.com showing me as the author. I neither receive compensation for those sales nor do I know who does receive compensation. If youpurchase such a book, please be aware that it is a copy of a module that is freely available on cnx.org and that it was made andpublished without my prior knowledge.
Affiliation : I am a professor of Computer Information Technology at Austin Community College in Austin, TX.
-end-
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