class Root Resource resources centers Centers self request self item e

class Root(Resource):
    resources = {'centers': Centers(self.request, self, item),
                 'examinations': Examinations(self.request, self, item),
                 'records': Records(self.request, self, item)
                }

    def __getitem__(self, item):
        if item in resources.keys():
            return resources[item]
        else:
            raise KeyError