code: def set_resource_attribute(self, attr, value):
          
  
          if attr not in self._supported_resource_attributes:
              raise KeyError("Unsupported resource attribute specified: %s" % attr)
  
          self.resource_attributes[attr] = value
docs: Sets attributes on resource. Resource attributes are top-level entries of a CloudFormation resource
          that exist outside of the Properties dictionary
  
          :param attr: Attribute name
          :param value: Attribute value
          :return: None
          :raises KeyError if `attr` is not in the supported attribute list