Due

Sunday, April 21st at 11:59 PM

Deliverables

There is one deliverable for this assignment

• hw11.py

Specification

The script must define two classes

• Collectable
• Baseball_Card

Baseball_Card is a subclass of Collectable

Collectable

Collectable must have the following attributes

• type
• purchased
• price

purchased and price MUST be stored as integers

All attributes must be hidden.

purchased and price must be stored as integers.

Collectable must have the following methods

• __init__
• get_type
• get_purchased
• get_price
• __str__

__str__ must return a string containing all attributes.

Baseball_Card

Baseball_Card must have the following attributes.

• player
• year
• company

All attributes must be hidden.

year and must be stored as an integer.

Baseball_Card must have the following methods

• __init__
• get_player
• get_year
• get_company
• __str__

__str__ must return a string containing all attributes.

Script for this assignment

Open an a text editor and create the file hw11.py.

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

Test Code

Your hw11.py file must contain the following test code at the bottom of the file:

col_1 = Collectable("Baseball card", 2018, 500)
print(col_1.get_type())
print(col_1.get_purchased())
print(col_1.get_price())
print(col_1)
bc_1 = Baseball_Card("Willie Mays", 1952, "Topps", 2018, 500)
print(bc_1.get_player())
print(bc_1.get_year())
print(bc_1.get_company())
print(bc_1)

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.

1. Create the file hw11.py.
   Write the class header for Collectable.
   Write the constructor for this class.
   Copy the test code to the bottom of the script.
   Comment out all line in the test code except the first.
   You comment out a line by making # the first character on the line.
   Run the script.
   Fix any errors you find.
2. Create the methods get_type, get_purchased and get_price.
   Uncomment the next three lines in the test code.
   Run the script.
   Fix any errors you find.
3. Create the __str__ method.
   Uncomment the next line in the test code.
   Run the script.
   Fix any errors you find.
4. Write the class header for Baseball_Card.
   Write the constructor for this class.
   When you call the __init__ method for Collectable you will have to supply the string "Baseball card" as the second argument.
   Uncomment the next line in the test code.
   Run the script.
   Fix any errors you find
5. Create the methods get_player, get_year and get_company.
   Uncomment the next three lines in the test code.
   Run the script.
   Fix any errors you find.
6. Create the __str__ method.
   Uncomment the last line in the test code.
   Run the script.
   Fix any errors you find.

Testing on Your Machine

• Open IDLE
• Use the Open command in IDLE to open hw11.py
• Under the Run menu, select Run Module
• Your output should look something like this

  Baseball card
  2018
  500
  Baseball card, 2018, 500
  Willie Mays
  1952
  Topps
  Willie Mays, 1952, Topps, Baseball card, 2018, 500

Copy the file to Unix

• Open FileZilla and connect to pe15.cs.umb.edu
  You will have to connect using your Unix username and password.
• Go to your 117 directory
• Go to your hw directory
• Inside this directory create the directory hw11
• Copy your hw11.py file from your machine to the hw11 directory on pe15

Make the File Executable

• Connect to pe15.cs.umb.edu
  Use an ssh client.
• Go to your it117 directory
  

  cd 117

• Go to your hw directory
  

  cd hw

• Go to your hw11 directory
  

  cd hw11

• Change the permissions on the script
  

  chmod 755 hw11.py

Copyright © 2021 Glenn Hoffman. All rights reserved. May not be reproduced without permission.