message: Do not use an extra variable for output namedtuple field list
  Before:
  _op_name_outputs = ["out1", "out2"]
  OpNameOutput = collections.namedtuple(
  ...,
  _op_name_outputs)
  After:
  OpNameOutput = collections.namedtuple(
  ...,
  ["out1", "out2"])
diff: @@ -766,36 +766,28 @@ void GenPythonOp::AddDocStringNameArg() {
  }
  void GenPythonOp::AddOutputGlobals() {
  - // Prepare a NamedTuple type to hold the outputs, if there are multiple
  + // Generate a namedtuple class to hold the outputs, if there are multiple.
  + // Example:
  + //
  + // _OpOutputs = collections.namedtuple(
  + // "_OpOutputs",
  + // "out1 out2 out3")
  if (num_outs_ > 1) {
  - // Prepare the list of output names
  - std::vector<string> out_names(num_outs_);
  + std::vector<string> out_names;
  + out_names.reserve(num_outs_);
  for (int i = 0; i < num_outs_; ++i) {
  - if (!api_def_.out_arg(i).rename_to().empty()) {
  - out_names[i] = api_def_.out_arg(i).rename_to();
  - } else {
  - out_names[i] = strings::StrCat("output", i);
  - }
  + const string out_name = !api_def_.out_arg(i).rename_to().empty()
  + ? api_def_.out_arg(i).rename_to()
  + : strings::StrCat("output", i);
  + out_names.push_back(strings::StrCat("\"", out_name, "\""));
  }
  - string out_names_list =
  - strings::StrCat("[\"", absl::StrJoin(out_names, "\", \""), "\"]");
  -
  - // Provide the output names as a Python list
  - string lower_op_name_outputs =
  - strings::StrCat("_", function_name_, "_outputs");
  - const string outputs_prefix = strings::StrCat(lower_op_name_outputs, " = ");
  - strings::StrAppend(&prelude_, "\n",
  - WordWrap(outputs_prefix, out_names_list, kRightMargin),
  - "\n");
  strings::StrAppend(&prelude_, "_", op_def_.name(),
  "Output = collections.namedtuple(\n");
  - const string tuple_type_prefix = " ";
  - const string tuple_type_suffix = strings::StrCat(
  - "\"", op_def_.name(), "\", ", lower_op_name_outputs, ")");
  - strings::StrAppend(
  - &prelude_, WordWrap(tuple_type_prefix, tuple_type_suffix, kRightMargin),
  - "\n\n");
  + strings::StrAppend(&prelude_, " \"", op_def_.name(), "\",\n");
  + strings::StrAppend(&prelude_, " [", absl::StrJoin(out_names, ", "),
  + "])");
  + strings::StrAppend(&prelude_, "\n\n");
  }
  strings::StrAppend(&prelude_, "\n");
  }
  