即使类属性的类型正确,也会获取异常

我目前正在从事一个项目,该项目有以下课程

    import operator

    class dummy:
    def __init__(self,
                 density):
        self.density = density
    
    density = property(operator.attrgetter('_density'))

    @property
    def density(self):
        return self._density
    
    @density.setter
    def density(self,value):
        if type(value) != int or type(value) != float:
            raise Exception("density must be int or float types!")
        elif value <= 0:
            raise Exception("density must be non-zero and positive!")
        self._density = value

每当我尝试这样运行此代码时,都会出现异常:

dev = dummy(density = 3.25)

这是我得到的错误:

----> 1 dev = dummy(density = 3.25)

~\AppData\Local\Temp/ipykernel_18292/2065730148.py in __init__(self, density)
      2     def __init__(self,
      3                  density):
----> 4         self.density = density
      5 
      6     density = property(operator.attrgetter('_density'))

~\AppData\Local\Temp/ipykernel_18292/2065730148.py in density(self, value)
     13     def density(self,value):
     14         if type(value) != int or type(value) != float:
---> 15             raise Exception("density must be int or float types!")
     16         elif value <= 0:
     17             raise Exception("density must be non-zero and positive!")

Exception: density must be int or float types!

我不知道我做错了什么。任何帮助都将不胜感激!