IT 117: Intermediate Scripting

IT 117: Introduction to Scripting
Homework 9

Due

Sunday, April 9th at 11:59 PM

Deliverables

There is one deliverable for this assignment

hw9.py

Make sure the script obeys all the rules in the Script Requirements page.

Specification

In your hw9.py define the class LP that has the following attributes

title
label
artist
released

The class must have the following methods

get_title
get_label
get_artist
get_released
__str__

All the attributes in this class MUST be hidden.

get_title

This method returns the value of the title attribute.

get_label

This method returns the value of the label attribute.

get_artist

This method returns the value of the artist attribute.

get_released

This method returns the value of the released attribute.

str

This method returns a string consisting of the value of the title attribute, followed by a comma and a space, the value of the label attribute, followed by a comma and a space, and the value of the artist attribute.

Script for this assignment

Open an a text editor and create the file hw9.py.

You can use the editor built into IDLE or a program like Sublime.

Test Code

Your hw9.py file must contain the following test code at the bottom of the file:

lp = LP("The London Concert", "Sony Classical", "Wynton Marsalis", "1994")
print(lp.get_title())
print(lp.get_label())
print(lp.get_artist())
print(lp.get_released())
print(lp)

You should see

$ ./hw9.py
The London Concert
Sony Classical
Wynton Marsalis
1994
The London Concert, Sony Classical, Wynton Marsalis, 1994

Suggestions

Write this program in a step-by-step fashion using the technique of incremental development.

In other words, write a bit of code, test it, make whatever changes you need to get it working, and go on to the next step.

Make a copy of your hw8.py file in your hw9 directory.
Change the name of this file to hw9.py
Remove all the test code from hw9.py
Run the script.
You should see nothing. Fix any problem you find.
Change __init__ by adding the parameter released.
Copy the first line of the test code to the bottom of your script.
Run the script.
You should see nothing. Fix any problem you find.
Change __init__ and get_title so the attribute title is hidden.
Copy the 2nd line of the test code to the bottom of your script.
Run the script.
Fix any problem you find.
Change __init__ and get_label so the attribute label is hidden.
Copy the 3rd line of the test code to the bottom of your script.
Run the script.
Fix any problem you find.
Change __init__ and get_artist so the attribute artist is hidden.
Copy the 4th line of the test code to the bottom of your script.
Run the script.
Fix any problem you find.
Change __init__ so it sets the value of the attribute released.
Create the method get_released that returns the value of this attribute.
Copy the 5th line of the test code to the bottom of your script.
Run the script.
Fix any problem you find.
Remove the method print_lp.
Replace it with the method __str__ which returns a string containing the values of each of the attributes.
Copy the last line of the test code to the bottom of your script.
Run the script.
Fix any problem 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

The London Concert
Sony Classical
Wynton Marsalis
1994
The London Concert, Sony Classical, Wynton Marsalis, 1994

Unix Setup

Log in to users3.cs.umb.edu
You will be in your home directory.
Go to your it117 directory
```
cd it117
```
Go to your hw directory
```
cd hw
```
Create a directory for this exercise
```
mkdir  hw9
```
Check that the directory was created
```
ls
```

Copy the file to Unix

Open FileZilla and connect to users3.cs.umb.edu
You will have to connect using your Unix username and password.
Copy the file to the to it117/hw/hw9

Testing the script on Unix

Connect to
Use an ssh client.
Go to the directory for this exercise
```
cd  it117/hw/hw9
```
Make this script executable
```
chmod  755 hw9.py
```
Run this script
```
./hw9.py
```

You should see something like

The London Concert
Sony Classical
Wynton Marsalis
1994
The London Concert, Sony Classical, Wynton Marsalis, 1994

If your script does not run on users3 you will lose points

Due