PYTHON FUNCTIONS PLEASE!

Write a program that converts a Roman number such as MCMLXXVIII to its decimal number representation. Hint: First write a function that yields the numeric value of each of the letters. Then use the following algorithm: total = 0 While the roman number string is not empty If value(first character) is at least valuejsecond character), or the string has length 1 Add value(first character) to total. Remove the character. Else Add the difference, value(second character) - value(first character), to total. Remove both characters