code: def find(self, _id, instance = None):
          
          
          if instance is None:
              # We are looking for an instance
              return self.service_instance.find(_id)
          else:
              # We are looking for a binding
              return self.service_binding.find(_id, instance)
docs: Find
          
          Args:
              _id (str): instance id or binding Id
              
          Keyword Arguments:
              instance (AtlasServiceInstance.Instance): Existing instance
              
          Returns:
              AtlasServiceInstance.Instance or AtlasServiceBinding.Binding: An instance or binding.