输出不对，<__main__.Vector object at 0x0000021835238790> <__main__.Vector object at 0x0000021835238790> <__main__.Vector object at 0x0000021835238790> <__main__.Vector object at 0x0000021835238790>

非常抱歉，我犯了一个错误。以下是修正后的代码：

class Vector:
    def __init__(self, x, y, z):
        self.x = x
        self.y = y
        self.z = z

    def __add__(self, other):
        return Vector(self.x + other.x, self.y + other.y, self.z + other.z)

    def __sub__(self, other):
        return Vector(self.x - other.x, self.y - other.y, self.z - other.z)

    def __mul__(self, scalar):
        return Vector(self.x * scalar, self.y * scalar, self.z * scalar)

    def __truediv__(self, scalar):
        return Vector(self.x / scalar, self.y / scalar, self.z / scalar)

    def __repr__(self):
        return f"Vector({self.x}, {self.y}, {self.z})"

    @property
    def length(self):
        return (self.x ** 2 + self.y ** 2 + self.z ** 2) ** 0.5

我添加了一个`__repr__`方法，用于在打印向量时返回可读性更好的字符串形式。请再次尝试使用：

a = Vector(1, 2, 3)
b = Vector(4, 5, 6)

print(a + b)  # 输出 Vector(5, 7, 9)
print(a - b)  # 输出 Vector(-3, -3, -3)
print(a * 10)  # 输出 Vector(10, 20, 30)
print(a / 2)  # 输出 Vector(0.5, 1.0, 1.5)
print(a.length)  # 输出 3.7416573867739413

这次应该能够正确输出结果了。