admin.py

from foo import view_helpers

class AdminView(views.BaseView):
    @view.view_config(route_name='admin.home',
                      decorator=views.logged_in_view_decorator,
                      renderer='admin/home.mako')
    @view_helpers.require_groups(['employees'])
    def home(self):
        resp = dict()
        resp['page_type'] = 'home'
        return resp

view_helpers.py

class require_groups(object):
    def __init__(self, arg1):
        self._arg1 = arg1

    def __call__(self, func):
        def wrapped(my_view):
            print(self._arg1)
            return my_view
        return wrapped(func)