class_docstr: Display a Vega-Lite visualization in the Jupyter Notebook.
code: def _prepare_spec(self, spec, data):
      return prepare_spec(spec, data)
  
imports: from __future__ import absolute_import
  from .base import VegaBase
  from .utils import prepare_spec
label_desc: Use image node_id 1 for calling the VegaLite obj's underlying member method code with example usage: obj._prepare_spec(spec, data) and returns: prepare_spec