• 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

Thursday, October 23rd at 11:59 PM

What You Need to Do

• Create the script hw10.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 hw10 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 hw10.py

Specification

• Define the class Wine that has the following attributes
  • vineyard
  • type
  • year
  • rating
• The script must contain XXX methods
• All the attributes in this class MUST be hidden
• The class must have the following methods
  • __init__
  • get_vineyard
  • get_type
  • get_year
  • get_rating
  • set_rating
  • __str__
  • __gt__
  • __lt__
  • __eq__
  • __ne__

Methods

__init__

• Header

  def __init__(self, vineyard, type, year):

• The constructor should set the value of rating to the empty string

get_vineyard

• Header

  def get_vineyard(self)

• This method returns the value of vineyard

get_type

• Header

  def get_type(self):

• This method returns the value of type

get_year

• Header

  def get_year(self):

• This method returns the value of year

get_rating

• Header

  def get_rating(self):

• This method returns the value of rating

set_rating

• Header

  def set_rating(self, rating):

• This method assigns a value to rating

__str__

• Header

  def __str__(self):

• This method returns a string containing the attribute values for vineyard, type and year

__gt__

• Header

  def __gt__(self, other):

• This method returns True if the object's value for year is greater than the other object's value for year

__lt__

• Header

  def __lt__(self, other):

• This method returns True if the object's value for year is equal to the other object's value for year

__eq__

• Header

  def __eq__(self, other)

• This method returns True if the object's value for year is equal to the other object's value for year

__ne__

• Header

  def __ne__(self, other):

• This method returns True if the object's value for year is not equal to the other object's value for year

Test Code

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

w1 = Wine("Pahkmeyer", "Merlot", 1999)
print("vineyard: ", w1.get_vineyard())
print("type:     ", w1.get_type())
print("year:     ", w1.get_year())
print("rating:   ", w1.get_rating())
w1.set_rating(95)
print(w1)
print("rating:  ", w1.get_rating())
w2 = Wine("Hartwell", "Merlot", 2000)
print(w2)
print("w1 > w2  :", w1 > w2)
print("w1 < w2  :", w1 < w2)
print("w1 == w2 :", w1 == w2)
print("w1 != w2 :", w1 != w2)

Output

• The output should look something like this

  type:      Merlot
  year:      1999
  rating:    
  Pahkmeyer Merlot 1999
  rating:   95
  Hartwell Merlot 2000
  w1 > w2  : False
  w1 < w2  : True
  w1 == w2 : False
  w1 != w2 : True

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 hw10.py.
   Write the class header for Wine.
   Write the constructor for this class.
   Make sure the constructor sets the value for each attribute, including rating.
   The value for year should be stored as an integer.
   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 get_vineyard.
   Uncomment the 2nd line of the test script by removing the #.
   Run the script.
   Fix any errors you find.
3. Create get_type.
   Uncomment the 3rd line of the test script.
   Run the script.
   Fix any errors you find.
4. Create get_year.
   Uncomment the 4th line of the test script.
   Run the script.
   Fix any errors you find.
5. Create get_rating.
   Uncomment the 5th line of the test script.
   Run the script.
   Fix any errors you find.
6. Create set_rating.
   Uncomment the next two lines of the test script.
   Run the script.
   Fix any errors you find.
7. Create __str__.
   Uncomment the next three lines of the test script.
   Run the script.
   Fix any errors you find.
8. Create __gt__ which returns True if the year of the object is greater than the year of the other object.
   Uncomment the next line of the test script.
   Run the script.
   Fix any errors you find.
9. Create __lt__ which returns True if the year of the object is less than the year of the other object.
   Uncomment the next line of the test script.
   Run the script.
   Fix any errors you find.
10. Create __eq__ which returns True if the year of the object is equal the year of the other object.
    Uncomment the next line of the test script.
    Run the script.
    Fix any errors you find.
11. Create __ne__ which returns True if the year of the object is not equal the year of the other object.
    Uncomment the next line of the test script.
    Run the script.
    Fix any errors you find.

Testing on Your Machine

• Open IDLE
• Use the Open command in IDLE to open hw10.py
• Under the Run menu, select Run Module
• Your output should look something like this

  vineyard:  Pahkmeyer
  type:      Merlot
  year:      1999
  rating:    
  Pahkmeyer Merlot 1999
  rating:   95
  Hartwell Merlot 2000
  w1 > w2  : False
  w1 < w2  : True
  w1 == w2 : False
  w1 != w2 : True

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 hw10 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/hw10

• Run this script

  hw10.py

• You should see something like this

  vineyard:  Pahkmeyer
  type:      Merlot
  year:      1999
  rating:    
  Pahkmeyer Merlot 1999
  rating:   95
  Hartwell Merlot 2000
  w1 > w2  : False
  w1 < w2  : True
  w1 == w2 : False
  w1 != w2 : True

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