TypeError:object .__ new __(int)不安全，请使用int .__ new __() [英] TypeError: object.__new__(int) is not safe, use int.__new__()

问题描述

在阅读本文时:什么是Python中的元类?，我正在使用以下代码段学习使用__new__:-

While reading this: What is a metaclass in Python?, I am learning to use __new__ using the following snippet:-

class a(object):
    pass

a.__new__(int,'abcdef',(int,),{})

使用a.调用__new__可能存在一些问题.但是，我收到以下错误，但我不理解其含义:-

There could be some problem in calling __new__ using a.. But, I get the following error, the meaning of which I do not understand:-

TypeError: object.__new__(int) is not safe, use int.__new__()

如果与__new__的使用有关，我可以通过阅读一些书来加以补充.但是，有人可以解释为什么出现此消息吗?

If there is something to do with the usage of __new__, I can ammend that by reading some books. But, can someone please explain why this message comes:

object.__new__(int) is not safe, use int.__new__()

推荐答案

简单地放入2.6之前的版本-object.__new__ 被忽略的参数...现在它实际上可以对它们起作用.因此，警告是可能会发生一些不同的事情.

Put simply, prior to 2.6 - object.__new__ ignored arguments... Now it actually may do something with them... So the warning is that something different may happen.

此帖子有关以下内容的任何想法__new__失去论据的最佳解决方法?-有更详细的解释.

This post Any ideas about the best work around for __new__ losing its arguments? - has a much more detailed explanation.

您可能还希望查看 http://docs.python.org /library/functions.html#type

知道Python中所有 meta 的功能都是很棒的，但是作为警告，我不会对此太挂念-因为我已经看到了一些非常聪明"的东西解决方案，那只是怪兽...

Knowing what's possible with all the meta stuff in Python is great, but just as a warning, I wouldn't get too hung up about it - as I've seen some really "clever" solutions, that are just monstrosities...

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