编写代码实现假分数加减乘除运算

下面是 Python 代码实现假分数加减乘除运算的示例：

class Fraction:
    def __init__(self, numerator, denominator):
        self.numerator = numerator
        self.denominator = denominator
        self.reduce()

    def __str__(self):
        return f"{self.numerator}/{self.denominator}"

    def reduce(self):
        gcd = self.get_gcd(self.numerator, self.denominator)
        self.numerator //= gcd
        self.denominator //= gcd

    def get_gcd(self, a, b):
        while b:
            a, b = b, a % b
        return a

    def get_lcm(self, a, b):
        return a * b // self.get_gcd(a, b)

    def __add__(self, other):
        lcm = self.get_lcm(self.denominator, other.denominator)
        numerator = self.numerator * lcm // self.denominator + other.numerator * lcm // other.denominator
        denominator = lcm
        return Fraction(numerator, denominator)

    def __sub__(self, other):
        lcm = self.get_lcm(self.denominator, other.denominator)
        numerator = self.numerator * lcm // self.denominator - other.numerator * lcm // other.denominator
        denominator = lcm
        return Fraction(numerator, denominator)

    def __mul__(self, other):
        numerator = self.numerator * other.numerator
        denominator = self.denominator * other.denominator
        return Fraction(numerator, denominator)

    def __truediv__(self, other):
        numerator = self.numerator * other.denominator
        denominator = self.denominator * other.numerator
        return Fraction(numerator, denominator)

使用示例：

f1 = Fraction(3, 4)
f2 = Fraction(2, 5)

print(f1 + f2)  # 输出 23/20
print(f1 - f2)  # 输出 7/20
print(f1 * f2)  # 输出 3/10
print(f1 / f2)  # 输出 15/8