django classonlymethod和python classmethod有什么区别？ [英] What is the difference between django classonlymethod and python classmethod?

问题描述

为什么Django需要介绍装饰器 classonlymethod ？
为什么不能重用python classmethod ？

Why is there a need for Django to introduce the decorator classonlymethod ? Why can't it reuse python classmethod?

推荐答案

最好的解释可能是源代码本身：

The best explanation may be the source code itself :

class classonlymethod(classmethod):
    def __get__(self, instance, owner):
        if instance is not None:
            raise AttributeError("This method is available only on the view class.")
        return super(classonlymethod, self).__get__(instance, owner)

区别在于一个 classmethod 可以在一个实例上调用，具有与在类上调用相同的效果，但只能在类上调用 classonlymethod 。

The difference is that a classmethod can be called on an instance, having the same effect as calling it on the class, but the classonlymethod can only be called on the class.

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