code: def rainbow(n):
      """
      Returns a list of colors sampled at equal intervals over the spectrum.
  
      Parameters
      ----------
      n : int
          The number of colors to return
  
      Returns
      -------
      R : (n,3) array
          An of rows of RGB color values
  
      Notes
      -----
      Converts from HSV coordinates (0, 1, 1) to (1, 1, 1) to RGB. Based on
      the Sage function of the same name.
      """
      from matplotlib import colors
  
      R = np.ones((1, n, 3))
      R[0, :, 0] = np.linspace(0, 1, n, endpoint=False)
      # Note: could iterate and use colorsys.hsv_to_rgb
      return colors.hsv_to_rgb(R).squeeze()
  
label_desc: Use image node_id 1 for calling a global function with example usage: rainbow(n) and returns: colors