code: def __init__(self, *args, **kwargs):
      super().__init__()
      self.messages = []
  
file_path: catboost/contrib/python/ipywidgets/py3/ipywidgets/widgets/tests/utils.py
imports: from ipywidgets import Widget
  import ipywidgets.widgets.widget
  import ipykernel.comm
label_desc: Use image node_id 1 to create a new DummyComm object  with example: obj = DummyComm()