IT 117: Intermediate Scripting

IT 117: Intermediate Scripting
Homework 9

Due
What You Need to Do
Setup On Your Machine
Specification
Test Code
Output
Suggestions
Testing on Your Machine
Copy the Script to Unix
Testing the Script on Unix (Optional)

Due

Sunday, April 13th at 11:59 PM

What You Need to Do

Create the script hw9.py
Make sure it obeys the rules in Rules for Homework Scripts
Make sure the script has a hashbang line and is executable
Move it to an an hw9 directory on pe15.cs.umb.edu

Setup On Your Machine

Open a text editor.
I would suggest the text editor built into the program IDLE.
Save the file as hw9.py
Copy the file book.txt from /home/ghoffman/course_files/it117_files.
Use FileZilla to do this.

Specification

Define the the class Book with the folloewing hidden attributes
- title
- sub_title
- author
- publisher
- copyright
- description
The constructor will set all attributes
It should set the value of description to the empty string
The class has 7 methods in addition to the constructor
- get_title(self)
- get_sub_title(self)
- get_author(self)
- get_publisher(self)
- get_description(self)
- set_description(self, description)
- __str__(self)
The first 5 methods are accessor that return the value of an attribute
set_description asigns a value to description
The string returned by __str__ should return the value of all attributes

Test Code

Your script must contain the following statements

They should appear at the bottom of your script

file = open('book.txt', 'r')
line_count = 0

for line in file:
    line_count += 1
    if line_count % 6 == 1:
        title = line.strip()
    elif line_count % 6 == 2:
        sub_title = line.strip()
    elif line_count % 6 == 3:
        author = line.strip()
    elif line_count % 6 == 4:
        publisher = line.strip()
    elif line_count % 6 == 5:
        copyright = line.strip()
    elif line_count % 6 == 0:
        description = line.strip()
 
b1 = Book(title, sub_title, author, publisher, copyright)
print('Title:', b1.get_title())
print('Sub_title:', b1.get_sub_title())
print('Author:', b1.get_author())
print('Publisher:', b1.get_publisher())
print('Copyright:', b1.get_copyright())
b1.set_description(description)
print('Description:', b1.get_description())
print(b1)

This code will only work if you have copied book.txt into the same directory as your script
You will find this file in /home/ghoffman/course_files/it116_files

Output

The output should look something like this

Title: Guns, Germs, and Steel
Sub_title: The Fates of Human Societies
Author: Jared Diamond
Publisher: Norton
Copyright: 1997
Description: How the accident of geography influences the development of technology
Guns, Germs, and Steel: The Fates of Human Societies, Jared Diamond, Norton (1997)

Suggestions

Write this script in stages
Test your script at each step
Print the steps below
And check them off as you finish each one

Add a header for the class Book to the script.
Create the method header for the constructor __init__ with parameters self, title, sub_title, author, publisher and copyright. For the body of this function, use a pass statement.
Run the script and fix any errors you find.
Copy the test code to the bottom of the script.
Comment out all the statements after
```
b1 = Book(title, sub_title, author, publisher, copyright)
```
Add assignment statements for each of the attributes.
The value for description should be the empty string.
Remember the attributes must be hidden.
Run the script and fix any errors you find.
Create the accesor method get_title that returns the value of title.
Remove the # from the next line in the test code.
Run the script and fix any errors you find.
Create the accesor method get_sub_title that returns the value of sub_title.
Remove the # from the next line in the test code.
Run the script and fix any errors you find.
Create the accesor method get_author that returns the value of author.
Remove the # from the next line in the test code.
Run the script and fix any errors you find.
Create the accesor method get_publisher that returns the value of publisher.
Remove the # from the next line in the test code.
Run the script and fix any errors you find.
Create the accesor method get_copyright that returns the value of copyright.
Remove the # from the next line in the test code.
Run the script and fix any errors you find.
Create the mutator method set_description that gives a value to the description attribute.
Remove the # from the next line in the test code.
Run the script and fix any errors you find.
Create the accesor method get_description that returns the value of description.
Remove the # from the next line in the test code.
Run the script and fix any errors you find.
Create __str__ that returns a string containing the value of all attributes with a comma between them.
Remove the # from the last line in the test code.
Run the script and fix any errors you find.

Testing on Your Machine

Open IDLE
Use the Open command in IDLE to open hw9.py
Under the Run menu, select Run Module

Your output should look something like this

Title: Guns, Germs, and Steel
Sub_title: The Fates of Human Societies
Author: Jared Diamond
Publisher: Norton
Copyright: 1997
Description: How the accident of geography influences the development of technology
Guns, Germs, and Steel: The Fates of Human Societies, Jared Diamond, Norton (1997)

Copy the Script to Unix

Open FileZilla and connect to pe15.cs.umb.edu
Go to your it117 directory
Go to your hw directory
Right-click in the whitespace inside the hw directory
Enter hw9 in the dialog box
Click and drag your script from the bottom left panel to the bottom right panel
Right-click on the file and select "Permissions" from the menu
Enter 755 in the box provided
This will make the script executable
Click and drag book.txt from the bottom left panel to the bottom right panel

Testing the Script on Unix (Optional)

Connect to pe15.cs.umb.edu using an ssh client like putty.exe (Windows) or ssh (Mac)
Go to the directory for this exercise
```
cd  it117/hw/hw9
```
Run this script
```
python3 hw9.py
```

You should see something like this

Title: Guns, Germs, and Steel
Sub_title: The Fates of Human Societies
Author: Jared Diamond
Publisher: Norton
Copyright: 1997
Description: How the accident of geography influences the development of technology
Guns, Germs, and Steel: The Fates of Human Societies, Jared Diamond, Norton (1997)