code: def get_plot_color(number):
      """Return color for a line number.
  
      Color are extracted from tab20 colormap which is an extension of
      matplotlib 2.x CN colors. 20 colors are available.
  
      Parameters
      ----------
      number : `int`
          Number of the color to pick
  
      Returns
      -------
      color : `str`
          Color in hexadecimal format
      """
      return tab20_colors[number % len(tab20_colors)]
  
imports: import numpy
label_desc: Use image node_id 1 for calling a global function with example usage: get_plot_color(number) and returns: tab20_colors