6
可能重复:
Private functions/Variables enforcement in pythonPython的静态类属性集/获取
可以在一两个静态属性,一个只读和其他读创建一个相当于下面的类在Python中写入?
class Foo
{
private static string _rdy = "RO";
public static string rd
{
get { return _rd; }
}
private static string _rw = "RW";
public static string rw
{
get { return _rw ; }
set { _rw = value; }
}
}
我知道read-only class properties在Python是可能的,但我怎么没见过在Python读写类属性的任何实例。可能吗?基本上我想:
class classproperty(object):
def __init__(self, getter
#, setter
):
self.getter = getter
# self.setter = setter
def __get__(self, instance, owner):
return self.getter(owner)
# Could there be a __set__ here?
#vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
#def __set__(self, instance, owner, value):
# self.setter(owner, value)
#^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
class Foo(object):
_ro = "RO"
_rw = "RW"
@classproperty
def ro(cls):
return cls._ro
# How would you this?
#vvvvvvvvvvvvvvvvvvvv
#@classproperty.setter
#^^^^^^^^^^^^^^^^^^^^
#def rw(cls, value):
# cls._rw, value
# This is what I need
>>> Foo.ro
RO
>>> Foo.ro = 'X' # Hypothetical Exception
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
AttributeError: class 'Foo' attribute 'ro' is not writable!
>>> Foo.rw
RW
>>> Foo.rw = 'NEW'
>>> Foo.rw
NEW
太好了。这是我见过的最简单的答案。 – Amal
当有__metaclasses__defined时,如何向这些类属性添加文档字符串? – Amal
有两种使用'property()'的方法。我展示并作为装饰者。装饰器表格保留文档字符串。我展示的方式是docstring将是第四个参数,而第三个参数是propery的删除方法。再次看到我包含的python文档链接。 –