Need help writing this program in Python.

Write a program with a loop that asks the user to enter a series of positive numbers. The user should enter a negative number, -99, to signal the end of the series. After all the positive numbers have been entered, the program should display their sum. But when a negative number is entered, the program should display a phrase like The number should be positive or -99 to quit!

Enter a positive number (negative 99 to quit): 9 Enter a positive number (negative 99 to quit): -3 The number should be positive or -99 to quit! Enter a positive number (negative 99 to quit): 8 Enter a positive number (negative 99 to quit): -99 Total = 17.00