python,decorator,class

http://stackoverflow.com/questions/9906144/python-decorate-a-class-by-defining-the-decorator-as-a-class

Apart from the question whether class decorators are the right solution to your problem:

in Python 2.6 and higher, there are class decorators with the @-syntax, so you can write:

@addIDclassFoo:pass

in older versions, you can do it another way:

classFoo:passFoo= addID(Foo)

Note however that this works the same as for function decorators, and that the decorator should return the new (or modified original) class, which is not what you‘re doing in the example. The addID decorator would look like this:

def addID(original_class):
    orig_init = original_class.__init__
    # make copy of original __init__, so we can call it without recursiondef __init__(self, id,*args,**kws):
        self.__id = id
        self.getId = getId
        orig_init(self,*args,**kws)# call the original __init__

    original_class.__init__ = __init__ # set the class‘ __init__ to the new onereturn original_class

You could then use the appropriate syntax for your python version as described above.

But I agree with others that inheritance is better suited if you want to override __init__.

python,decorator,class

原文：http://www.cnblogs.com/threef/p/3539479.html