# -*- coding: utf-8 -*-
class ProviderHandler(JSONHandler):
    @classmethod
    def check(cls, cluster):
        if cluster.provider != cls.provider:
            raise Exception()
class FirstHandler(ProviderHandler):
    provider = "first"
    def PUT(self, cluster_id):
        cluster = self.get_object_or_404(Cluster, cluster_id)
        self.check(cluster)  # this is the check
        #  lots of code here - copy-paste is not suitable solution
class SecondHandler(FirstHandler):
    provider = "second"
    def PUT(self, cluster_id):
        cluster = self.get_object_or_404(Cluster, cluster_id)
        self.check(cluster)  # this is the check 2
        super(
            SecondHandler,
            self
        ).PUT(cluster_id)