Use a base class method as a decorator in derived classes

Question

I have come across a situation where I have a base class and multiple derived classes. In each of the derived classes I am doing an action of extracting common data from input given to method. Thus I have written that piece of code in base class as method so that derived classes could use it directly. But I want to call this function from each method where I want to perform this action. My question is that can I write a decorator for this action? I want this decorator to be a member of base class. Is it possible to use base class method as a decorator in derived classes?

Answer 1

Base class:

class BaseRequestHandler(object):

    def __init__(self):
        self.request=None
        self.response=None

    def extractheader(self,requestin):
        ##extracts header from incoming request

Derived class:

class DerivedRequestHandler1(BaseRequestHandler):

    def __init__(self):
        super(DerivedRequestHandler1, self).__init__()  

    def handlermethod(self,requestin)
        ##extract headed
        ##call internal API with header