Method DictValueIterator

tensorflow/python/util/util.cc:339–346

class DictValueIterator : public ValueIterator {
 public:
  explicit DictValueIterator(PyObject* dict)
      : dict_(dict), keys_(PyDict_Keys(dict)) {
    if (PyList_Sort(keys_.get()) == -1) {
      invalidate();
    } else {
      iter_.reset(PyObject_GetIter(keys_.get()));
    }
  }

  Safe_PyObjectPtr next() override {
    Safe_PyObjectPtr result;