| 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 |