code: def add_stickiness(self):
          
          stickiness_dict = {}
          env = boto3.session.Session(profile_name=self.env, region_name=self.region)
          elbclient = env.client('elb')
          elb_settings = self.properties['elb']
          for listener in elb_settings.get('ports'):
              if listener.get("stickiness"):
                  sticky_type = listener['stickiness']['type'].lower()
                  externalport = int(listener['loadbalancer'].split(":")[-1])
                  policyname_tmp = "{0}-{1}-{2}-{3}"
                  if sticky_type == 'app':
                      cookiename = listener['stickiness']['cookie_name']
                      policy_key = cookiename.replace('.', '')
                      policyname = policyname_tmp.format(self.app, sticky_type, externalport, policy_key)
                      elbclient.create_app_cookie_stickiness_policy(
                          LoadBalancerName=self.app, PolicyName=policyname, CookieName=cookiename)
                      stickiness_dict[externalport] = policyname
                  elif sticky_type == 'elb':
                      cookie_ttl = listener['stickiness'].get('cookie_ttl', None)
                      policyname = policyname_tmp.format(self.app, sticky_type, externalport, cookie_ttl)
                      if cookie_ttl:
                          elbclient.create_lb_cookie_stickiness_policy(
                              LoadBalancerName=self.app, PolicyName=policyname, CookieExpirationPeriod=cookie_ttl)
                      else:
                          elbclient.create_lb_cookie_stickiness_policy(LoadBalancerName=self.app, PolicyName=policyname)
                      stickiness_dict[externalport] = policyname
          return stickiness_dict
docs: Adds stickiness policy to created ELB
  
          Returns:
              dict: A dict of stickiness policies and ports::
  
                  example:
                  {
                      80: "$policy_name"
                  }