code: def get_d3_scale_chromatic_url(self):
      return (
          DEFAULT_D3_SCALE_CHROMATIC
          if self.d3_scale_chromatic_url is None
          else self.d3_scale_chromatic_url
      )
  
imports: import pkgutil
  from typing import Tuple
  from scattertext.Common import DEFAULT_D3_URL, DEFAULT_D3_SCALE_CHROMATIC, DEFAULT_HTML_VIZ_FILE_NAME, AUTOCOMPLETE_CSS_FILE_NAME, SEARCH_FORM_FILE_NAME
  from scattertext.viz.ScatterplotStructure import InvalidProtocolException
label_desc: Use image node_id 3 for calling the D3URLs obj's underlying member method code with example usage: obj.get_d3_scale_chromatic_url() and returns: unknown