创建对象并向其添加属性

创建对象并向其添加属性

本文介绍了Python:创建对象并向其添加属性的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我想在Python中创建一个动态对象(在另一个对象内部),然后向其中添加属性。



我试过:

  $ 



如何设置基于属性的属性上面的例子中 p 的价值?

解决方案

使用我古老的食谱,但如果你不想做一个束类,一个非常简单的一个已经存在于Python - 所有函数可以有任意属性(包括lambda函数)。所以,以下工作:

  obj = someobject 
obj.a = lambda:None
setattr obj.a,'somefield','somevalue')

Bunch 食谱是OK的,是一个风格决定我当然会留给你。


I want to create a dynamic object (inside another object) in Python and then add attributes to it.

I tried:

obj = someobject
obj.a = object()
setattr(obj.a, 'somefield', 'somevalue')

but this didn't work.

Any ideas?

edit:

I am setting the attributes from a for loop which loops through a list of values, e.g.

params = ['attr1', 'attr2', 'attr3']
obj = someobject
obj.a = object()

for p in params:
   obj.a.p # where p comes from for loop variable

In the above example I would get obj.a.attr1, obj.a.attr2, obj.a.attr3.

I used the setattr function because I didn't know how to do obj.a.NAME from a for loop.

How would I set the attribute based on the value of p in the example above?

解决方案

You could use my ancient Bunch recipe, but if you don't want to make a "bunch class", a very simple one already exists in Python -- all functions can have arbitrary attributes (including lambda functions). So, the following works:

obj = someobject
obj.a = lambda: None
setattr(obj.a, 'somefield', 'somevalue')

Whether the loss of clarity compared to the venerable Bunch recipe is OK, is a style decision I will of course leave up to you.

这篇关于Python:创建对象并向其添加属性的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!

08-24 00:16