| A | B | 
|---|
| string | a group of 1 or more characters encased in quotation marks. | 
| substring | part of a string. | 
| in operator | a membership test operator. | 
| formatting | The way you make output look | 
| Boolean | expression evaluates to either true or false. | 
| case sensitive | uppercase and lowercase characters are treated differently. | 
| old style formatting | uses modulo(%) operator. | 
| new style formatting | uses the .format() method | 
| formatting code | formatting string is a special symbol or argument specifier that tells the interpreter how to display your string. | 
| flag | a formatter string in the placeholder |