EX11 - More Classes

In Exercise 11, we will be constructing more classes to model some mini battles between animals.

0. Pull the skeleton code

You will find the starter files needed by “pulling” from the course workspace repository. Before beginning, be sure to:

  1. Be sure you are in your course workspace. Open the file explorer and you should see your work for the course. If you do not, open your course workspace through File > Open Recent.
  2. Open the Source Control View by clicking the 3-node (circles) graph (connected by lines) icon in your sidebar or opening the command palatte and searching for Source Control.
  3. Click the Ellipses in the Source Control pane and select “Pull” from the drop-down menu. This will begin the pulling process from the course repository. It should silently succeed.
  4. Return to the File Explorer pane and open the exercises directory. You should see it now contains the directory named ex11. If you expand those directories, you will see the starter files for this exercise. You should notice the ex11 directory appear.

If the above did not work, try the following:

  1. Click the Ellipses in the Source Control pane and select “Pull, Push” from the drop-down menu. Then select “Pull from”. Then select “upstream” and the main option. This will begin the pulling process from the course repository. It should silently succeed.
  2. Return to the File Explorer pane and open the exercises directory. You should see it now contains another directory named ex11. If you expand that directory, you should see the starter files

Part 1. Animal Class

Add the following import statements directly below your module level docstring. You’ll get a syntax error if you put them below your __author__ variable.

from __future__ import annotations

Write a class called Animal with the following specifications:

  1. Each Animal object should have 3 attributes including:
    • a str attribute called species
    • an int attribute called danger_level
    • a str attribute called emoji

  2. The Animal class should have a constructor that takes in species, danger_level, and emoji, in this order. This means it will have ** 4 parameters including self**.

  3. Your class should also have 1 methods: fight. The functionality of this methods should be as described below.

    3.1 fight

    • This method takes in an Animal parameter named opponent (and self) and returns Animal.
    • fight should return the animal with the higher danger_level.
    • If they have the same danger_level then the opponent should win (be returned)

Part 2. Team Class

Write a class called Team with the following specifications:

  1. Each Team object should have 3 attributes including:
    • a str attribute called team_name
    • an list[Animal] attribute called animals
    • an int attribute called score

  2. Your Team class should have a constructor that takes in two parameters in addition to self: team_name and animals, in this order. The constructor should also initialize score to 0.

  3. Your class should also have 2 methods called battle and who_won. The functionality of these methods should be as described below:

    3.1 battle

    This method takes in a Team parameter named opponent (and self) and returns list[Animal]. battle should:

    • Make sure the animals list in self and opponent are of equal size and return an empty list if not.
    • Iterate through the animals lists in self and opponent and make use of the fight method in Animal to match up the animals at equivalent indices. For instance self.animals[0] should fight opponent.animals[0].
    • Increase the score attribute of the correct team when one of their fighters wins.
    • Return a list that contains the winners of each fight. For instance the winner of self.animals[0] vs opponent.animals[0] should be at index 0 of the return list.

    3.2 who_won

    This method takes in a Team parameter named opponent (and self) and returns str. who_won should:

    • Return “The battle hasn’t happened yet” if both scores are 0
    • Return “It was a tie!” if both scores are equal but not 0
    • Return “Team <team_object.team_name> won!” using which ever team has the higher score.

Part 3. Test it out!

We have provided some starter code commented out in main for you all to play around with your classes and try some battles. Uncomment these lines and run your program to test it out. Feel free to play around!

4. Make a Backup Checkpoint “Commit”

As you make progress on this exercise, making backups is encouraged. Note that you do not have to make a backup in order to submit your work, though you are encouraged to before each submission so that you can revert back to a previous point in your project if you accidentally change something you did not intend to.

  1. Open the Source Control panel (Command Palette: “Show SCM” or click the icon with three circles and lines on the activity panel).
  2. Notice the files listed under Changes. These are files you’ve made modifications to since your last backup.
  3. Move your mouse’s cursor over the word Changes and notice the + symbol that appears. Click that plus symbol to add all changes to the next backup. You will now see the files listed under “Staged Changes”.
    • If you do not want to backup all changed files, you can select them individually. For this course you’re encouraged to back everything up.
  4. In the Message box, give a brief description of what you’ve changed and are backing up. This will help you find a specific backup (called a “commit”) if needed. In this case a message such as, “Progress on Exercise 3” will suffice.
  5. Press the Check icon to make a Commit (a version) of your work.
  6. Finally, press the Ellipses icon (…), look for “Pull/Push” submenu, and select “Push to…”, and in the dropdown select your backup repository.

4. Submit to Gradescope for Grading

Login to Gradescope and select the assignment named “EX11 - More Classes”. You’ll see an area to upload a zip file. To produce a zip file for autograding, return back to Visual Studio Code.

If you do not see a Terminal at the bottom of your screen, open the Command Palette and search for “View: Toggle Integrated Terminal”.

To produce a zip file for ex11, type the following command (all on a single line):

python -m tools.submission exercises/ex11

In the file explorer pane, look to find the zip file named “21.mm.dd-hh.mm-exercises-ex11.zip”. The “mm”, “dd”, and so on, are timestamps with the current month, day, hour, minute. If you right click on this file and select “Reveal in File Explorer” on Windows or “Reveal in Finder” on Mac, the zip file’s location on your computer will open. Upload this file to Gradescope to submit your work for this exercise.