Function PyUnpack_String

oneflow/api/python/framework/tensor_functions_util.h:28–34

using functional::PyObjectPtr;

std::string PyUnpack_String(PyObject* obj) {
  CHECK_OR_THROW(PyUnicode_Check(obj)) << "PyUnpack_String(): expect a PyUnicode object";
  Py_ssize_t size = -1;
  const char* data = PyUnicode_AsUTF8AndSize(obj, &size);
  CHECK_NOTNULL_OR_THROW(data) << "error unpacking string as utf-8";
  return std::string(data, (size_t)size);
}

// For signature like Tensor.reshape(*shape), this function can handle these cases:
// 1. parse positional arguments only case, like Tensor.reshape(1, 2)