code: def set_attribute(self, attribute, value, callback=None):
          
          return self.connection.set_queue_attribute(self, attribute, value, callback=callback)
docs: Set a new value for an attribute of the Queue.
          
          :type attribute: String
          :param attribute: The name of the attribute you want to set.  The
                             only valid value at this time is: VisibilityTimeout
          :type value: int
          :param value: The new value for the attribute.
                        For VisibilityTimeout the value must be an
                        integer number of seconds from 0 to 86400.
  
          :rtype: bool
          :return: True if successful, otherwise False.