Please write program in Python 3 (IDLE)

Part 2-Shipping Calculator Sample Output: Shipping Calculator Cost of items ordered: 49.99 Shipping cost: 7.95 Total cost: 57.94 Continue? (y): y Cost of items ordered: -65.50 You must enter a positive number. Please try again Cost of items ordered: 65.50 shipping cost: 9.95 Total cost: 75.45 Continue? (y): n Bye! Specifications: Use the following table to calculate shipping cost: Cost of Items Shipping Cost $30.00 $30.00 $49.99 $7.95 $50.00- $74.99 $9.95 > $75.00 $5.95 Free If the user enters a number that's less than zero, display an error message and give the user a chance to enter the number again