15-112 Agenda 18-June

• Quiz median: 81.5
• Looking forward:
  • Today: OOP, hw13 assigned
  • Tuesday: OOPy animations, hw14 assigned
  • Wednesday: Dealing with large code bases + TP assignment
  • Thursday: review
  • Friday: in class final; no recitation
  • Friday: TP Mentors assigned
• Final Exam Friday
  • 80 minutes; in lecture
  • Skewed towards content from after midterm1, but anything is fair game
  • animation probably won’t be grid based (closer to hw14)
  • More details later this week
• Content
  • What do we currently do to keep code organized?
    • Functions!
    • Helper function!
    • MVC
  • What do we do when we want to store multiple things with the same properties (for example a bunch of circles in an animation)?
    • Specially crafted lists
    • This can be confusing: why is circle[2] the radius? Wouldn’t circle.radius be nicer?
  • Solution: Object Oriented Programming (OOP)
  • Objects (realizations) and Classes (general descriptions)
    • Here’s how to describe a 112 student
    • Here’s 3 actual students in 112
  • Vocab: Objects are also called instances
  • Syntax for classes + objects, and __init__
  • Defining your own methods
  • Vocab: attributes (properties) and methods (behaviors)
  • Vocab: method vs function
  • Special methods
    • __hash__
    • __repr__
    • __str__
    • __eq__
  • An example tying this all together with the Student class
  • OOP is great for modeling real world objects
  • What about the relationships between these real world objects?
  • For example: students are all humans. Dogs are all mammals. Etc.
  • Inheritance:
    • Allows us to model those real world relationships without repeating code
  • Example of Human + Student class without inheritance
  • Example of inheritance using Human –> Student –> 112 Student
  • overwriting methods
  • super()
  • type vs isinstance
  • Not covered:
    • class attributes
    • static methods
    • multiple inheritance
• Attendance Check: https://tinyurl.com/summer112att16