code: def construct_docstring(options):
          
          s = "\nParameters\n"
          s += "----------\n\n"
          for key, opt in options.items():
              s += "%s : %s\n      %s [%s]\n" % (key, str(opt[2]),
                                                 str(opt[1]), str(opt[0]))
          return s
docs: Construct a docstring for a set of options