code: def __init__(self, data=None):
      self.data = data
  
imports: import pytest
  from traitlets import Bool, Tuple, List, Instance, CFloat, CInt, Float, Int, TraitError, observe
  from .utils import setup, teardown
  import ipywidgets
  from ipywidgets import Widget
label_desc: Use image node_id 1 to create a new DataInstance object  with example: obj = DataInstance(data)