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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 provides a preview of code that will beexplained in more detail in the module titled Itse1359-1070-Strings Part 2 in this book .
I recommend that you open another copy of this module in a separate browser window and use the following links to easily find and view the Figuresand Listings while you are reading about them.
(Note to blind and visually impaired students: The Figures and Listings in this module arepresented in plain text format and should be accessible using an audio screen reader or a braille display.)
This module provides a preview of code that will be explained in more detail in a future module. The purpose of this module is to provide an opportunity foryou to work through and to think about the code on your own before reading the explanation. This should give you a clear assessment of what you already knowand what you don't yet understand. The hope is that by working through and thinking about the code before reading the explanation, you will be betterprepared to retain the knowledge later when you do read the explanation.
This approach is based loosely on the concept of Intentional Programming as incorporated in the instructor-led Java programming courseware that is available from TKP .
You will be writing the code based on instructions provided in comments. Once this program is completed, it should produce the outputshown in Figure 1 .
| Figure 1. Program output. |
|---|
1.T
2.s3.This
4.string5.This
6.string7.This is a string
8.This is a string9.Empty:
10.tri11.16
12.This is a string |
Copy the code template from Listing 1. into your favorite Python text editor or IDE. Then make the modifications described in the comments by replacing each instance of #?? with oneor more statements. Feel free to run the program at any point in the process in order to compare your output with the required output shown in Figure 1 .
| Listing 1. Program code template. |
|---|
# File String01.py
# Rev 03/21/15# Copyright 2015, R. G. Baldwin
# Illustrates indexing and# slicing strings
##-------------------------------
aStr = "This is a string""""Print the output shown on Line 1."""
#??"""Print the output shown on Line 2."""
#??"""Print the output shown on Line 3."""
#??"""Print the output shown on Line 4."""
#??"""Print the output shown on Line 5 using different syntax than 3 above."""
#??"""Print the output shown on Line 6 using different syntax than 4 above."""
#??"""Print the output shown on Line 7 as the concatenation of two slices
of aStr."""#??
"""Print the output shown on Line 8 as a single slice of aStr."""#??
"""Print the output shown on Line 9 as the concatenation of the word, the colon,a space, and a slice of aStr."""
#??"""Print the output shown on Line 10 as a slice counting backwards from the
right end of aStr."""#??
"""Print the length of aStr as shown on Line 11."""#??
print("12." + aStr) |
If you get stuck and are unable to successfully complete one of the modifications, you will find the correct code in the module titled Itse1359-1070-Strings Part 2 except that the code in that module does not produce the line numbers shown in Figure 1 .
This section contains a variety of miscellaneous information.
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 am a professor of Computer Information Technology at Austin Community College in Austin, TX.
-end-
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