如何获取以分数的“分子/分母”形式返回分数字符串版本的方法

def get_fraction_string(numerator, denominator):
    if denominator == 0:
        return "错误：除数不能为0"

    if numerator == 0:
        return "0"

    sign = "-" if numerator * denominator < 0 else ""
    numerator = abs(numerator)
    denominator = abs(denominator)

    # 辗转相除法求最大公约数
    def gcd(a, b):
        while b:
            a, b = b, a % b
        return a

    gcd_value = gcd(numerator, denominator)
    numerator //= gcd_value
    denominator //= gcd_value

    return sign + str(numerator) + "/" + str(denominator)