For this assignment you were supposed to Read chapter 4 (Variables,
Expressions and Statements) and 6 (Keyboard Input) in the online book of
“Python 2: For Beginners Only and run all the examples and exercises.
(a common mistake that occurs is that when you cut/paste the code directly
from the tutorial, there will be extra empty spaces before certain lines,
then you will encounter a syntax error message “unexpected indent” when you
run the program. Fix the problem by deleting the extra indent.)
