$>>>$ def eye$\_$care$($medication$)$ :

print$($medication$)$

Snippet $9\mathrm{.}3$

Call the function eye$\_$care, as shown in Snippet $9\mathrm{.}4$:

$>>>$ eye$\_$care$($Eye$)$

Snippet $9\mathrm{.}4$

The exception thrown is shown in Snippet $9\mathrm{.}5$:

Traceback $($most recent call last$)$:

File $"",$ line $1,$ in

NameError: name 'Eye' is not defined

Snippet $9\mathrm{.}5$

Use can also use the raise keyword to raise an exception, as shown in Snippet $9\mathrm{.}6$:

raise NameError$(\text{'}$An exception has occurred.$\text{'})$

Snippet $9\mathrm{.}6$

The exception thrown is shown in Snippet $9\mathrm{.}7$:

Traceback $($most recent call last$)$:

File $"",$ line $1,$ in

NameError: An exception has occurred.