Python：在访问任何类属性时调用一个函数

Question

This is a little hard to explain but here is what I want to do: I want to create a function / property on my class that will do the following. No matter what field I access it compares the value of that field to the rest of the attributes and returns something.

For example:

class myClass(object):
    a = 1
    b = 2
    c = 3

    def myProp(sef, accessed_attribute):
        return someting like you accessed <name of attrib>  and it is the largest value of all all of the attribues" 

basically it compares the value to the rest of the attributes without having to write a property for each attribute.

Answer 1

如果要在访问类属性（而不是实例属性）时调用此函数，则可以为类使用自定义元类，并在此元类中重写__getattribute__方法。