code: def serialize_resource(cls, id, checksum=None):
      return cls._serialize(
          ExternalSchema.SandboxResource, 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 16 for calling the ExternalDataInfo obj's underlying member method code with example usage: obj.serialize_resource(cls, id, checksum) and returns: cls