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

Due

Sunday, April 19th at 11:59 PM

What You Need to Do

• Create the script hw11.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 hw11 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 hw11.py

Specification

• In this script you must define two classes
  • Product
  • Dry_Good
• Dry_Good is a subclass of Product
• Product will have the following attributes
  • name
  • sku
  • price
  • source
• All attributes must be hidden
• Product must have the following methods
  • __init__
  • get_name
  • get_sku
  • get_price
  • get_source
  • __str__
• Dry_Good will have the following unique attribute
  • weight
• All attributes must be hidden
• Dry_Good must have the following methods
  • __init__
  • __str__
  • get_weight

Product Methods

__init__

• Header

  def __init__(self, name, sku, price, source):

• The constructor must set all attributes, storing price as a float

get_name

• Header

  def get_name(self):

• This method must return the value of the name attribute

get_sku

• Header

  def get_sku(self):

• This method must return the value of the sku attribute

get_price

• Header

  def get_price(self):

• This method must return the value of the price attribute

get_source

• Header

  def get_source(self):

• This method must return the value of the source attribute

__str__

• Header

  def __str__(self):

• This method must return a string containing the values of all attributes

Dry_Good Methods

__init__

• Header

  def __init__(self, name, sku, price, source, weight):

• The constructor must set all attributes, storing weight as an integer.

__str__

• Header

  def __str__(self):

• This method must return a string containing the values of all attributes

get_weight

• Header

  def get_weight(self):

• This method must return the value of the weight attribute

Test Code

• Your script must contain the following statements

  p_1 = Product("Large Economy Tide", "132532112352", 4.57, "P&G")
  print(p_1)
  print(p_1.get_name())
  print(p_1.get_sku())
  print(p_1.get_price())
  print(p_1.get_source())
  dg_1 = Dry_Good("Large Economy Tide", "132532112352", 4.57, "P&G", 40)
  print(dg_1)
  print(dg_1.get_weight())

• They should appear at the bottom of your script

Output

• The output should look something like this

  Large Economy Tide: 132532112352 4.57, P&G
  Large Economy Tide
  132532112352
  4.57
  P&G
  Large Economy Tide: 132532112352 4.57, P&G, Weight: 40
  40

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 hw11.py.
   Write the class header for Product.
   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. Write __str__.
   Remove the # from the 2nd line of the test code.
   Run the script.
   Fix any errors you find.
3. Write get_name.
   Remove the # from the 3rd line of the test code.
   Run the script.
   Fix any errors you find.
4. Write get_sku.
   Remove the # from the 4th line of the test code.
   Run the script.
   Fix any errors you find.
5. Write get_price.
   Remove the # from the 5th line of the test code.
   Run the script.
   Fix any errors you find.
6. Write get_source.
   Remove the # from the 6th line of the test code.
   Run the script.
   Fix any errors you find.
7. Write the class header for Dry_Good.
   Write the constructor for this class.
   Remove the # from the 7th line of the test code.
   Run the script.
   Fix any errors you find.
8. Write __str__.
   Remove the # from the 8th line of the test code.
   Run the script.
   Fix any errors you find.
9. Write get_weight.
   Remove the # from the last line of 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

  Large Economy Tide: 132532112352 4.57, P&G
  Large Economy Tide
  132532112352
  4.57
  P&G
  Large Economy Tide: 132532112352 4.57, P&G, Weight: 40
  40

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 hw11 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 HHHHHH 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/hw11

• Run this script

  hw11.py

• You should see something like this

  Large Economy Tide: 132532112352 4.57, P&G
  Large Economy Tide
  132532112352
  4.57
  P&G
  Large Economy Tide: 132532112352 4.57, P&G, Weight: 40
  40

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