def GetELBZones(region, node_types=None):
 balancers = GetLoadBalancers(region, node_types=node_types)
 res = []
 for b in balancers:
  res.extend(b.availability_zones)
 return res

def GetELBZones ( region , node_types = None ) : balancers = GetLoadBalancers ( region , node_types = node_types ) res = [ ] for b in balancers : res . extend ( b . availability_zones ) return res
return a list of availability zone names covered by the load balancers in a given region .