装饰只是SY函数调用ntactic糖,这样的装饰应用到属性,你只需要调用它的初始化器:
在你的情况,你可以创建实现描述符协议对象:
class GroupedAttribute(object):
def __init__(self, group, obj):
self.group = group
self.obj = obj
def __get__(self, obj, owner):
return self.obj
def __set__(self, obj, value):
self.obj = value
高雅,你可以写一个类属性组:
class GroupedAttribute(object):
def __init__(self, group, obj):
self.group = group
self.obj = obj
def __get__(self, obj, owner):
return self.obj
def __set__(self, obj, value):
self.obj = value
class AttributeGroup(object):
def __call__(self, obj):
return GroupedAttribute(self, obj)
def __get__(self, obj, owner):
return BoundAttributeGroup(self, obj, owner)
class BoundAttributeGroup(object):
def __init__(self, group, obj, owner):
self.group = group
self.obj = obj
self.owner = owner
def __dir__(self):
items = dir(self.owner if self.obj is None else self.obj)
return [item for item in items if
getattr(self.owner.__dict__.get(item, None),
'group', None) is self.group]
用法:
class MyClass(object):
bar = AttributeGroup()
a = bar(5)
b = bar("foo")
c = False
dir(MyClass.bar) # ['a', 'b']
我会说#2是要走的路。这是迄今为止最简单,最简单的方法。 – delnan
所以我忘了写 - 我想从这个列表中获得一些想法;) – mnowotka
您的意思是“保持这个分组属性接近属性”是什么意思?您是否指代字典的键值存储属性? – abought