如何模拟返回不同对象的链式python函数

class ChainableFunction:
    def __init__(self, value):
        self.value = value
    
    def add(self, num):
        self.value += num
        return self
    
    def subtract(self, num):
        self.value -= num
        return self
    
    def multiply(self, num):
        self.value *= num
        return self
    
    def divide(self, num):
        if num != 0:
            self.value /= num
        return self
    
    def get_result(self):
        return self.value

result = ChainableFunction(10).add(5).subtract(3).multiply(2).divide(4).get_result()
print(result)  # 输出: 3.0