Do all the items on this Preparation page BEFORE this session's scheduled class time.

1. Conditionals: IF and IF-ELSE and IF-ELIF-ELIF...ELSE statements: Reading.
   • The above PDF was constructed from portions of Chapter 5. Conditionals, which itself is part of How to Think Like a Computer Scientist: Learning with Python 3 by Peter Wentworth, Jeffrey Elkner, Allen B. Downey, and Chris Meyers.
   • The book is a nice online resource, as are the other books from the Open Book Project.
2. The Accumulator Pattern (revisited): Video [9:36]
   • This video extends the accumulator pattern from the summing pattern that you have seen previously to include the counting and in-graphics accumulator patterns.
   • The video uses a graphics system call Zellegraphics that preceded RoseGraphics, so you will see zg instead of rg and other such small changes from what we use now.
3. First Do a Concrete Example By Hand: Video [10:39]
   • In almost ANY non-trivial software development coding problem, you simply MUST do a concrete example by hand, as shown in this video.
   • Note: The video uses the following example: Given a line, draw a diamond from the line. The video should have said that the given line is the upper-left line of the diamond. Instead, the video wrongly spoke of "positive slope".
4. Optional:
   • You might find it helpful to review previous videos, especially the ones on:
     • Thinking Like a Computer: Control Flow , and
     • Thinking Like a Computer: Namespaces, Parameters, and Returns.