class_docstr: A custom Vega-Lite display object.
code: def _prepare_spec(self, spec, data):
      return spec
  
file_path: ipyvega/vega/base.py
imports: from __future__ import absolute_import
  import json
  import uuid
  from IPython.display import display
  from .None import utils
label_desc: Use image node_id 2 for calling the VegaBase obj's underlying member method code with example usage: obj._prepare_spec(spec, data) and returns: spec