| ```console | |
| $ 04_01_possible --help | |
| A simple to use, efficient, and full-featured Command Line Argument Parser | |
| Usage: 04_01_possible[EXE] <MODE> | |
| Arguments: | |
| <MODE> What mode to run the program in [possible values: fast, slow] | |
| Options: | |
| -h, --help Print help | |
| -V, --version Print version | |
| $ 04_01_possible fast | |
| Hare | |
| $ 04_01_possible slow | |
| Tortoise | |
| $ 04_01_possible medium | |
| ? failed | |
| error: invalid value 'medium' for '<MODE>' | |
| [possible values: fast, slow] | |
| For more information, try '--help'. | |
| ``` |