code: def serialize_delayed(cls, upload_id, checksum):
      return cls._serialize(ExternalSchema.Delayed, upload_id, checksum)
  
imports: from __future__ import absolute_import
  import re
  import sys
  import copy
  import logging
  from .None import tools
  from datetime import date, datetime
  import enum
  import six
label_desc: Use image node_id 17 for calling the ExternalDataInfo obj's underlying member method code with example usage: obj.serialize_delayed(cls, upload_id, checksum) and returns: cls