Go to Chapter 5 of A Smarter Way.
A. Variable names can’t be enclosed in quotes.
B. Variable names can’t have spaces in them.
C. Variable names can’t start with numbers.
D. Variable names can’t be reserved words like print, if and import. Note the list on page 29.
Exercise
Go to http://www.asmarterwaytolearn.com/python/5.html and review the exercises.