The example program below shows how the above methods might be used to store passenger names and travel destinations in a database. The use of strip$(),$ lower$(),$ and upper$()$ standardize user$-$input for easy comparison.

Run the program below and add some passengers into the database. Add a duplicate passenger name, using different capitalization, and print the list again.

menu$\_$prompt $=(\text{'}$Available commands:

$\text{'}$

$\text{'}($add$)$ Add passenger

$\text{'}$

$\text{'}($del$)$ Delete passenger

$\text{'}$

$\text{'}($print$)$ Print passenger list

$\text{'}$

$\text{'}($exit$)$ Exit the program

$\text{'}$

'Enter command:

$\text{'})$

destinations $=[\text{'}$PHX$\text{'},$ 'AUS', 'LAS'$]$

destination$\_$prompt $=(\text{'}$Available destinations:

$\text{'}$

$\text{'}($PHX$)$ Phoenix

$\text{'}$

$\text{'}($AUS$)$ Austin

$\text{'}$

$\text{'}($LAS$)$ Las Vegas

$\text{'}$

'Enter destination:

$\text{'})$

passengers $=\{\}$

print$(\text{'}$Welcome to Mohawk Airlines!

$\text{'})$

user$\_$input $=$ input$($menu$\_$prompt$).$strip$().$lower$()$

while user$\_$input $!=$ 'exit':

if user$\_$input $==$ 'add':

name $=$ input$(\text{'}$Enter passenger name:

$\text{'}).$strip$().$upper$()$

destination $=$ input$($destination$\_$prompt$).$strip$().$upper$()$

if destination not in destinations:

print$(\text{'}$Unknown destination.

$\text{'})$

else:

passengers$[$name$]=$ destination

elif user$\_$input $==$ 'del':

name $=$ input$(\text{'}$Enter passenger name:

$\text{'}).$strip$().$upper$()$

if name in passengers:

del passengers$[$name$]$

elif user$\_$input $==$ 'print':

for passenger in passengers:

print$(\text{'}\{\}-->\{\}\text{'}.$format$($passenger$.$title$(),$ passengers$[$passenger$]))$

else:

print$(\text{'}$Unrecognized command.$\text{'})$

user$\_$input $=$ input$(\text{'}$Enter command:

$\text{'}).$strip$().$lower$()$