fancy_decorator.py

import functools
import inspect


class Bar:
    def changelist_view(self, request, extra_content):
        print("Bar.changelist_view(request={}, extra_content={})".format(request, extra_content))

    def change_view(self, request, object_id, form_url, extra_content):
        print("Bar.change_view(request={}, object_id={}, form_url={}, extra_content={})"
            .format(request, object_id, form_url, extra_content))

    def update_global_ctf(self, ctf):
        print("Bar.update_global_ctf(ctf={})".format(ctf))


# Intercepted calls are changed so that they execute:
#     self.update_global_ctf(ctf)
#     return super().<method>(<rest_args>)
def intercepted(method):
    method.intercepted = True
    return method


class Foo(Bar):
    @intercepted
    def changelist_view(self, request, ctf, extra_content=None):
        pass

    @intercepted
    def change_view(self, request, ctf, object_id, form_url='', extra_context=None):
        pass

    def not_intercepted(self):
        return 5


def decorate(cls, method):
    @functools.wraps(method)
    def _decorated(self, request, ctf, *a, **kw):
        self.update_global_ctf(ctf)
        return getattr(super(cls, self), method.__name__)(request, *a, **kw)

    return _decorated

methods = inspect.getmembers(Foo, predicate=inspect.isfunction)

for method_name, method in filter(lambda m: getattr(m[1], 'intercepted', False), methods):
    #print(method_name, method)
    decorated = decorate(Foo, method)
    setattr(Foo, method_name, decorated)


Foo().changelist_view(1, 'ctf1', 3)
Foo().change_view(1, 'ctf2', 3, 4, 5)