Try

Select the button below to open the Python program in a new window. Run the program and read the lines of code to see if you can understand how it works. It will be helpful to arrange your display so that you can have this browser window on one side of the screen and the code on the other.

Watch this video to learn about the new concepts shown in the program:

Investigate

Questions to think about with this program to check your understanding:

Explain the purpose of the iteration and condition while value >= resale_value and resale_value > 0: in line 9.

Reveal answer

The value of the car is recalculated until the value is less than the resale value and is also more than £0. The first condition stops when the resale value is reached and the second condition ensures the value cannot go below £0.

Explain why line 13 is not indented.

Reveal answer

The final output statement about when to part exchange the car should not be inside the iteration because it needs to be executed after the year to part exchange has been calculated. This statement should only be output once, not after every calculation.

Make

Change the program so that it:

Only allows the value of the car to be shown up to year 4. Cars cannot be part exchanged with this dealer after year 5.

Typical inputs and outputs from the program would be:

Enter the value of the car purchased: £8500
Enter the minimum part exchange value: £2000
In year 0 the car is worth £ 8500
In year 1 the car is worth £ 6375
In year 2 the car is worth £ 4781
In year 3 the car is worth £ 3585
In year 4 the car is worth £ 2688
Part exchange before the end of year 5