code: def template_graph_coloring(filename):
      graph = read_graph(filename)
  
      dsatur_instance = dsatur(graph.data)
      dsatur_instance.process()
      coloring = dsatur_instance.get_colors()
  
      print("Number colors: ", max(coloring))
  
      draw_graph(graph, coloring)
  
imports: from pyclustering.utils.graph import read_graph, draw_graph
  from pyclustering.samples.definitions import GRAPH_SIMPLE_SAMPLES
  from pyclustering.gcolor.dsatur import dsatur
label_desc: Use image node_id 1 for calling a global function with example usage: template_graph_coloring(filename) without return types