code: def named_colorscales():
      """
      Returns lowercased names of built-in continuous colorscales.
      """
      from _plotly_utils.basevalidators import ColorscaleValidator
  
      return [c for c in ColorscaleValidator("", "").named_colorscales]
  
imports: import decimal
  from numbers import Number
  from _plotly_utils import exceptions
  from .None import qualitative, sequential, diverging, cyclical, cmocean, colorbrewer, carto, plotlyjs
label_desc: Use image node_id 19 for calling a global function with example usage: named_colorscales() and returns: unknown