Python:如何用常规属性替换属性? [英] Python: How to replace a property with a regular attribute?

问题描述

基类有这个:

def _management_form(self):
    # code here
    return form
management_form = property(_management_form)

在我的派生类中，我试图这样写:

In my derived class, I'm trying to write this:

self.management_form = self.myfunc()

但这当然行不通.它告诉我无法设置属性"，因为该属性没有设置器.但是我不想设置它，我想重新定义managent_form"的含义.我尝试将 del self.managent_form 放在第一位，但这也不起作用.那么我该如何取消它的属性化呢?

But of course it doesn't work. It tells me "can't set attribute" because that property has no setter. But I don't want to set it, I want to redefine what "managent_form" means. I tried putting del self.managent_form first, but that didn't work either. So how do I unproperty-ize it?

推荐答案

您可以分配给类，而不是实例:

You could assign to the class, instead of the instance:

MyClass.management_form = property(self.myfunc)

当然，这会更改所有实例(甚至预先存在的实例)的类本身.如果没问题，您也可以只调用一次，而不是在每个派生类构造函数中(我猜这就是您现在正在做的).

Of course, this changes the class itself for all instances (even preexisting ones). If this is OK, you can also call it exactly once, rather than in every derived-class constructor (which I'm guessing is what you're doing now).

否则，您可以在派生类中以通常的方式覆盖它:

Otherwise, you can override it in the derived class in the usual manner:

class MyOtherClass(MyClass):
    def _new_mf(self):
        # Better code
        return form
    management_form = property(new_mf)

这篇关于Python:如何用常规属性替换属性?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IT屋！