You should be able to define and explain the following terms:

• Object-oriented programming, including
  • methods
  • an object's instance variables
  • the constructor, or __init__ method
  • the string, or __str__, method
  • access methods, getters
  • update methods, setters
  • self

You should understand and be able to use the following Python concepts:

• How to define a Python class, including its constructor, string method, and the instance variables.
• How to use a Python class to create objects and call its methods.

Practice problems:

1. Write a Student class that stores information for a Swarthmore student. The class should include the following instance variables:
   • id, an integer identifier for the student
   • firstName, a string
   • lastName, a string
   • courses, a list of strings, the course names that the student is enrolled in
   • hobbies, a list of strings, the student's hobbies
   Write the following methods for your Student class:
   • A constructor that, given an id, a first name, and a last name, creates a Student with those values and empty lists of courses and hobbies.
   • A string method that returns a string representing the student.
   • Getter methods for each of the instance variables in the class.
   • An addCourse method that, given a course name, adds that course to the student's course list.
   • An addHobby method that, given a hobby name, adds that hobby to the student's hobby list.
   • A getCredits method that returns the number of courses a student is enrolled in. You can assume that each course is worth 1 credit.
   • A getFreeTime method that returns the value 55 - 12*number-of-courses - 5*number-of-hobbies. (Alternatively, this method could just return 0.)
2. Test your student class by creating a main program with several student bojects. Make sure to test that each method works as expected.
3. According to the textbook: "Objects know stuff and can do stuff." Explain what this means. How are objects different from functions?