Putting it Together I

Let's put a bunch of concepts together.

Let's create a basic checkbook to keep track of how much money we have.

together.py

balance = 0
option = ''

while option != 'q':
    option = input(f'${balance} A)dd Money  S)ubtract Money Q)uit:')

    match option:
        case 'a':
            print('Add money')
            # Ask user for how much money to add
            # Update the balance variable
        case 's':
            print('Subtract money')
            # Ask user for how much money to subtract
            # Update the balance variable

Output:

$0 A)dd Money  S)ubtract Money Q)uit:a
Add money

$0 A)dd Money  S)ubtract Money Q)uit:s
Subtract money

$0 A)dd Money  S)ubtract Money Q)uit:q
Done.

Links

• Beginner's Guide

Exercises (5 mins)

1. Complete the together.py program. And a case statement for when the user enters an invalid value.

   $0 A)dd Money  S)ubtract Money Q)uit:j
   Invalid option
   
   $0 A)dd Money  S)ubtract Money Q)uit:a
   Add money
   Enter amount:10
   
   $10 A)dd Money  S)ubtract Money Q)uit:s
   Subtract money
   Enter amount:20
   
   $-10 A)dd Money  S)ubtract Money Q)uit:a
   Add money    
   Enter amount:30
   
   $20 A)dd Money  S)ubtract Money Q)uit:q
   Done.