roman_number

def roman_to_int(roman_number: str) -> int:
    d_one = {"I": 1, "V": 5, "X": 10, "L": 50,  "C": 100, "D": 500, "M": 1000}
    #d_two = {"IV": 4, "IX": 9, "XL": 40, "XC": 90, "CD": 400, "CM": 900}

    res = 0
    ind = 0
    """while ind < len(roman_number):
        num = roman_number[ind: ind + 2]
        if num in d_two:
            res += d_two[num]
            continue
        res += d_one[roman_number[ind]]
        ind += 1
    return res"""
    for i in range(len(roman_number) - 1):
        if d_one[roman_number[i]] < d_one[roman_number[i+1]]:
            res -= d_one[roman_number[i]]
        else:
            res += d_one[roman_number[i]]

    res += d_one[roman_number[-1]]
    return res