使用object时的AttributeError .__ setattr__

Question

最后三行有什么问题？

class FooClass(object): 
    pass 
bar1 = object() 
bar2 = object() 
bar3 = object() 
foo1 = FooClass() 
foo2 = FooClass() 
foo3 = FooClass() 
object.__setattr__(foo1,'attribute','Hi') 
foo2.__setattr__('attribute','Hi') 
foo3.attribute = 'Hi' 
object.__setattr__(bar1,'attribute','Hi') 
bar2.attribute = 'Hi' 
bar3.attribute = 'Hi' 

我需要具有单个属性（类似foo）的对象我应该定义一个类（如FooClass）只是呢？

Answer 1

object是built-in type，所以你不能覆盖它的实例的属性和方法。

也许你只是想要一个dictionary或collections.NamedTuples：

>>> d = dict(foo=42) 
{'foo': 42} 
>>> d["foo"] 
42 

>>> from collections import namedtuple 
>>> Point = namedtuple('Point', ['x', 'y'], verbose=True) 
>>> p = Point(11, y=22)  # instantiate with positional or keyword arguments 
>>> p[0] + p[1]    # indexable like the plain tuple (11, 22) 33 
>>> x, y = p    # unpack like a regular tuple 
>>> x, y (11, 22) 
>>> p.x + p.y    # fields also accessible by name 33 
>>> p      # readable __repr__ with a name=value style Point(x=11, y=22) 

Answer 2

您不能将新的属性添加到object()，只有子类。

尝试collections.NamedTuple s。

此外，而不是object.__setattr__(foo1,'attribute','Hi'),setattr(foo1, 'attribute', 'Hi')会更好。