code: def except_handle(tokens):
      
      if len(tokens) == 1:
          errs, asname = tokens[0], None
      elif len(tokens) == 2:
          errs, asname = tokens
      else:
          raise CoconutInternalException("invalid except tokens", tokens)
      out = "except "
      if "list" in tokens:
          out += "(" + errs + ")"
      else:
          out += errs
      if asname is not None:
          out += " as " + asname
      return out
docs: Process except statements.