Python Vector3 3D向量类

Code
# -*- coding: UTF-8 -*-
'''
Vector3 3D向量类
关于操作符重载 http://docs.python.org/reference/datamodel.html
'''

import math

class Vector3():

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

    #置为零向量
    def zero():
        self.x = 0
        self.y = 0
        self.z = 0

    #"=" 赋值不支持重载

    #重载 "==" 操作符
    def __eq__(self, other):
        return self.x == other.x and self.y == other.y and self.z == other.z

    #重载 "!=" 操作符     
    def __ne__(self, other):
        return self.x != other.x or self.y != other.y or self.z != other.z

    #重载一元 "-" 操作符