使用python的罗马数字转换器

def roman_to_integer(roman):
    roman_dict = {'I': 1, 'V': 5, 'X': 10, 'L': 50, 'C': 100, 'D': 500, 'M': 1000}
    result = 0
    prev_value = 0
    
    for i in range(len(roman)-1, -1, -1):
        current_value = roman_dict[roman[i]]
        
        if current_value < prev_value:
            result -= current_value
        else:
            result += current_value
            
        prev_value = current_value
        
    return result

def integer_to_roman(integer):
    roman_dict = {1000: 'M', 900: 'CM', 500: 'D', 400: 'CD', 100: 'C', 90: 'XC', 50: 'L', 40: 'XL', 10: 'X', 9: 'IX', 5: 'V', 4: 'IV', 1: 'I'}
    result = ''
    
    for value, symbol in roman_dict.items():
        while integer >= value:
            result += symbol
            integer -= value
            
    return result