Testing

• You are allowed to access a wide variety of digital materials on the exam, which is good
• Giving you that access makes it difficult for me to verify the integrity of the exam though, which is less good
• Enter the virtual proctor tool, which takes periodic snapshots of your screen during an exam
• Let’s test it now, to see if it holds up to an entire class sharing

Problem 1: Predicate Refactoring

• Prob1.py in today’s contents contains four different poorly constructed predicate functions
• Your task is to clean them up!
  • Add docstrings as necessary
  • Reduce each function to a 1-liner (2 with the function header) using boolean operations
  • The literals True and False should not show up in the function anywhere

Problem 2: Sandwich Making

• Prob2.py contains a basic function definition to create and print a sandwich to the screen
• At the bottom you can specify the arguments to craft a particular sandwich. Enter arguments to create a:
  • Non-toasted turkey sandwich on sourdough with mustard and swiss. Cut in two.

Problem 2: Sandwich Defaults

• You may have made a mistake entering in the ingredients, or just lamented how much you had to type
• Let’s provide some good defaults.
• Decide with your group what a reasonable default would be for each of the initial parameters, and adjust the make_sandwich function header to create those defaults

Problem 2: More Sandwiches

• Create and print the following sandwiches, typing as little into the function call as possible (use your defaults where you can!)
  • A beef sandwich on white bread with swiss cheese and mustard. Toasted and cut.
  • A bologna sandwich on rye with cheddar cheese and mustard. Untoasted and uncut.
  • A ham sandwich on white bread with cheddar cheese and mayo. Untoasted and cut.

Problem 3: Utility Functions

• Write one function that could become part of a PGL utility library
• It should create a GObject, position it, customize it, and return it
• Should include many parameters (with sane defaults) to customize, detailed on next slide

Problem 3: Parameters to Include

Growing Trees