code: def write(self,f):
          
          f.write("* regularization\n")
          for vline in REG_VARIABLE_LINES:
              vraw = vline.strip().split()
              for v in vraw:
                  v = v.replace("[",'').replace("]",'')
                  if v not in self.optional_dict.keys():
                      raise Exception("RegData missing attribute {0}".format(v))
                  f.write("{0} ".format(self.__getattribute__(v)))
              f.write("\n")
docs: write the regularization section to an open
          file handle
  
          Parameters
          ----------
          f : file handle