code: def is_data_pub_stream(data: Any) -> bool:
      # try:
      #     from lets_plot.display import DataPubStream
      #     return isinstance(data, DataPubStream)
      # except ImportError:
      #     return False  # no pub-sub in standalone deployment
      return False
  
file_path: lets-plot/python-package/lets_plot/plot/util.py
imports: from collections.abc import Iterable
  from datetime import datetime
  from typing import Any, Tuple, Sequence, Optional, Dict
  from lets_plot._type_utils import is_dict_or_dataframe
  from lets_plot.geo_data_internals.utils import find_geo_names
  from lets_plot.mapping import MappingMeta
  from lets_plot.plot.core import aes
label_desc: Use image node_id 3 for calling a global function with example usage: is_data_pub_stream(data) and returns: False