Lecture 18 - Announcements / Notes

Announcements

• Exam 3 - generally went better than Exam 2.

  • Exam 3 Score distribution:

  

  • Current course grade distribution:

• Your final exam grade replaces the midterm grade component if it’s better

  • (you must have taken at least 2 midterm exams for this to apply)

• Schedule tweak: there is no E20. There is (still) a POTD 20.

Plan for Today

• E18T

  • when done, write:

    def copy_list(in_list):
        """ Return a new list object containing the same elements as in_list.
            Precondition: in_list's contents are all immutable. """
    
    # Example usage:
    a = [1, 2, 3, 4]
    b = copy_list(a)
    b[0] = 0
    print(a[0], b[0])
    # prints 1, 0

    and

    def cull(a):
       """ Remove a randomly chosen half of the elements from the given list """
    
    # Example usage:
    a = [1, 2, 3, 4]
    cull(a)
    print(a)
    # prints [2, 3] (or any other choice of 2 elements from the original list)

• P17

• P18 setup