docs: def oefmt(w_type, valuefmt, *args):
      """Equivalent to OperationError(w_type, space.wrap(valuefmt % args)).
      More efficient in the (common) case where the value is not actually
      needed. Note that in the py3k branch the exception message will
      always be unicode.
  
      Supports the standard %s and %d formats, plus the following:
  
      %8 - The result of arg.decode('utf-8')
      %N - The result of w_arg.getname(space)
      %R - The result of space.unicode_w(space.repr(w_arg))
      %T - The result of space.type(w_arg).name
  
      """
      if not len(args):
          return OpErrFmtNoArgs(w_type, valuefmt)
      OpErrFmt, strings = get_operr_class(valuefmt)
      return OpErrFmt(w_type, strings, *args)