Python -将罗马字符转换为整数

def roman_to_int(s):
    roman_dict = {'I': 1, 'V': 5, 'X': 10, 'L': 50, 'C': 100, 'D': 500, 'M': 1000}
    result = 0
    prev_value = 0
    for c in s[::-1]:
        curr_value = roman_dict[c]
        if curr_value >= prev_value:
            result += curr_value
        else:
            result -= curr_value
        prev_value = curr_value
    return result

# 示例用法
print(roman_to_int('III'))  # 输出 3
print(roman_to_int('IV'))   # 输出 4
print(roman_to_int('IX'))   # 输出 9
print(roman_to_int('LVIII'))  # 输出 58
print(roman_to_int('MCMXCIV'))  # 输出 1994