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

Due

Sunday, November 9th 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

Specification

• Define the class LP
• This class must have the following 4 attributes
  • title
  • label
  • artist
  • released
• All the attributes must be hidden
• The class must have the following 6 methods
  • __init__
  • get_title
  • get_label
  • get_artist
  • get_released
  • __str__

Methods

__init__

• Header

  def __init__(self, title, label, artist, released):

• This function must set all four attributes
• All attributes must be hidden

get_title

• Header

  def get_title(self):

• This method returns the value of the title attribute

get_label

• Header

  def get_label(self):

• This method returns the value of the label attribute

get_artist

• Header

  def get_artist(self):

• This method returns the value of the artist attribute

get_released

• Header

  def get_released(self):

• This method returns the value of the released attribute

__str__

• Header

  def __str__(self):

• This method returns a string with the values of all four attributes
• Each attribute must be followed by a comma and a space

Test Code

• Your script must contain the following statements
• They should appear at the bottom of your script

  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)

Output

• The output should look something like this

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

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

1. Create the file hw9.py.
   Write the class header for LP.
   Write the constructor for this class.
   Make sure the constructor has parameters for each attribute.
   Make sure the constructor sets the value for each attribute.
   Remember, all attributes must be hidden.
   Add the test code to the bottom of the script.
   Comment out all but the first line of the script.
   Run the script.
   Fix any errors you find.
2. Create the method get_title.
   Uncomment the second line of the test code to the bottom of the file.
   Run the script.
   Fix any errors you find.
3. Create the method get_label.
   Uncomment the third line of the test code to the bottom of the file.
   Run the script.
   Fix any errors you find.
4. Create the method get_artist.
   Add the fourth line of the test code to the bottom of the file.
   Run the script.
   Fix any errors you find.
5. Create the method get_released.
   Uncomment the fifth line of the test code to the bottom of the file.
   Run the script.
   Fix any errors you find.
6. Create the method __STR__.
   Return a string containing the value of all attributes each one separated from the next by a comma and a space.
   Uncomment 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

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

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

  hw9.py

• You should see something like this

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

Copyright © 2020 Glenn Hoffman. All rights reserved. May not be reproduced without permission.