code: def _print_stream_parameters(self, values):
          
          cprint("{0}".format(*values), "magenta", attrs=["bold"])
          print("{4}".format(*values))
          cprint("  available formats:   {1}".format(*values), "blue")
          cprint("  mandatory selectors: {2}".format(*values), "red")
          cprint("  optional selectors:  {3}".format(*values), "green")
          print()
docs: Print a coloured help for a given tuple of stream parameters.