No Negative Args, Please!¶

Download and run the starter code.

What you should see¶

3 items at $2.99 each is:
$8.97

In the main function, make the item_price a negative number. i.e., -2.99. Run the program and explain what happens. Answer the following in a comment.
- What is the error?
- What is the message?
- On what line does the error occur?
- What caused the error?
In the calc_subtotal function, add a check for the quantity value. Quantities cannot be negative so also raise a ValueError if the quantity is negative. In the main function fix the item_price variable to make it positive and make the quantity negative to observe the error.
In the main function, make both item_price and quantity negative. What do you see and what do you not see. Explain in a comment.