Final answer:
To enhance the Product Viewer program, you can add a condition that checks if the user enters a product number greater than 3. If true, display a message to enter a number between 1 and 3.
Step-by-step explanation:
To enhance the Product Viewer program, you can add a condition that checks if the user enters a product number greater than 3. If this condition is true, you can display a message to the user saying, 'Please type a number between 1 and 3.' This can be implemented by adding an 'if' statement after the user enters the product number, and using the 'print' function to display the message.
Here is an example of how you can modify the code:
if product_number > 3:
print('Please type a number between 1 and 3')
By making this modification, the program will prompt the user to enter a valid product number within the range of 1 to 3, ensuring that they do not enter an invalid value.