lesson2-recap

An instruction that evaluates to a single value is an expression. An instruction that doesn't is a statement.
IDLE is an editor.
The interactive shell window has the >>> prompt.
The file editor window is where you enter code for complete programs.
Data types: int, float, string
Strings hold text and begin and end with quotes: ‘Hello world!'
Values can be stored in variables: spam = 42
Variables can be used anywhere values can be used in expressions: spam + 1