Decision structures

In class exercises
Lab 04 and solutions for today's exercises have been posted to update21. Run update21 at the command prompt to get these updates 
$ update21
Creating /home/adas/cs21/solutions/w04-graphics
  Adding /home/adas/cs21/solutions/w04-graphics/circleShift.py
  Adding /home/adas/cs21/solutions/w04-graphics/animate.py
Change into your inclass directory. 
[~]$ cd
[~]$ cd cs21/inclass/
[inclass]$ ls
w01-intro/  w02-numAndString/  w03-decisions/ w04-graphics/
If the w04-graphics directory does not yet exist, create it using mkdir 
[inclass]$ mkdir w04-graphics
Copy the sample files for today from my directory using cp 
[inclass]$ cp ~adanner/public/cs21/w04-graphics/* w04-graphics/
[inclass]$ ls
w01-intro/  w02-numAndString/  w03-decisions/ w04-graphics/
[inclass]$ cd w04-graphics/
[w04-graphics]$ ls
animate.py  circleShift.py
[w04-graphics]$
Shifty Circles
The first program we will look at is circleShift.py.