code: def __init__(self, *args, **kwargs):
      super(DummyComm, self).__init__(*args, **kwargs)
      self.messages = []
  
file_path: catboost/contrib/python/ipywidgets/py2/ipywidgets/widgets/tests/utils.py
imports: from ipykernel.comm import Comm
  from ipywidgets import Widget
label_desc: Use image node_id 1 to create a new DummyComm object from inherited base classes: Comm with example: obj = DummyComm()