I have a class Point3D that creates a vertical numpy matrix and can be edited:

import numpy as np

class Point3D:
    def __init__(self, x, y, z):

        self.vector = np.matrix([x, y, z])
        self.vector = self.vector.reshape(3, 1)
    
    def __str__(self):
        n = self.__class__.__name__
        return f'{n}({self.x}, {self.y}, {self.z})'

    @property
    def x(self): return self.vector.item((0, 0))
    @property
    def y(self): return self.vector.item((1, 0))
    @property
    def z(self): return self.vector.item((2, 0))

    @x.setter
    def x(self, x_val): self.vector.itemset((0, 0), x_val)
    @y.setter
    def y(self, y_val): self.vector.itemset((1, 0), y_val)
    @z.setter
    def z(self, z_val): self.vector.itemset((2, 0), z_val)

In another file, I have code that moves a camera (the camera is a Point3D), this is the final part of the code:

self.camera_pos.x += (self.player_VX / (self.fps.get_fps() + 0.1))
self.camera_pos.z += (self.player_VZ / (self.fps.get_fps() + 0.1))

For some reason, even though the expression on the right is nonzero, camera_pos is not changing. Why?