code: def __init__(self, attributes=[]) -> None:
      self.event_name = None
      self.attributes = attributes
      self.payload = {}
  
imports: from __future__ import annotations
  import pytest
  from bokeh.core.serialization import Deserializer
  from bokeh.models import Button, Div, Plot, TextInput
  from bokeh import events
label_desc: Use image node_id 1 to create a new EventCallback object  with example: obj = EventCallback(attributes)