code: def color(self, idx):
      colidx = tab10_index[idx % len(tab10_index)]
      return self.lcolors[colidx]
  
imports: from __future__ import absolute_import, division, print_function, unicode_literals
label_desc: Use image node_id 2 for calling the PlotScheme obj's underlying member method code with example usage: obj.color(idx) and returns: self