code: def get_instance_attribute(self, instance_id, attribute):
          
          params = {'InstanceId' : instance_id}
          if attribute:
              params['Attribute'] = attribute
          return self.get_object('DescribeInstanceAttribute', params,
                                 InstanceAttribute, verb='POST')
docs: Gets an attribute from an instance.
  
          :type instance_id: string
          :param instance_id: The Amazon id of the instance
  
          :type attribute: string
          :param attribute: The attribute you need information about
                            Valid choices are:
  
                            * instanceType|kernel|ramdisk|userData|
                            * disableApiTermination|
                            * instanceInitiatedShutdownBehavior|
                            * rootDeviceName|blockDeviceMapping
  
          :rtype: :class:`boto.ec2.image.InstanceAttribute`
          :return: An InstanceAttribute object representing the value of the
                   attribute requested