code: def serialize_file(
      cls,
      path,
      checksum=None,
      diff_tool=None,
      local=False,
      diff_file_name=None,
      diff_tool_timeout=None,
      size=None,
  ):
      attrs = {}
      if diff_tool:
          attrs["diff_tool"] = diff_tool
      if local:
          attrs["local"] = local
      if diff_file_name:
          attrs["diff_file_name"] = diff_file_name
      if diff_tool_timeout:
          attrs["diff_tool_timeout"] = diff_tool_timeout
      if size is not None:
          attrs["size"] = size
      return cls._serialize(
          ExternalSchema.File, path, checksum, attrs=attrs
      )
  
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 15 for calling the ExternalDataInfo obj's underlying member method code with example usage: obj.serialize_file(cls, path, checksum, diff_tool, local, diff_file_name, diff_tool_timeout, size) and returns: cls