CPython - 将属性添加到包含__dict__的新类型

Question

我知道你可以添加Writables成员：

  

struct PyMemberDef * PyTypeObject.tp_members

但我不想将自己局限于特定数量的属性。所以我根据Andrew Floren解决方案创建了一个带有 __ dict __ 的对象：Create a Python type from C that implements a __dict__?

我现在可以在Python中添加属性，但是如果我想在C中添加属性呢？ 如何在C中使用 __ dict __ 向对象添加属性？

PyObject with __dict __...

typedef struct {
  PyObject_HEAD
  PyObject* dict;
} BarObject;

static PyTypeObject BarObject_Type = {
  PyObject_HEAD_INIT(NULL)
};

PyMODINIT_FUNC
initFoo(void)
{
  PyObject *m;

  m = Py_InitModule("Foo", NULL);
  if (m == NULL)
    return;

  BarObject_Type.tp_new = PyType_GenericNew;
  BarObject_Type.tp_name = "Foo.Bar";
  BarObject_Type.tp_basicsize = sizeof(BarObject);
  BarObject_Type.tp_getattro = PyObject_GenericGetAttr;
  BarObject_Type.tp_setattro = PyObject_GenericSetAttr;
  BarObject_Type.tp_flags = Py_TPFLAGS_DEFAULT;
  BarObject_Type.tp_dictoffset = offsetof(BarObject,dict);
  BarObject_Type.tp_doc = "Doc string for class Bar in module Foo.";
  if (PyType_Ready(&BarObject_Type) < 0)
    return;

  Py_INCREF(&BarObject_Type);
  PyModule_AddObject(m, "Bar", (PyObject*)&BarObject_Type);
}

Answer 1

解决方案： 基本上dict偏移量必须是dict类型的PyObject

BarObject *bar = PyObject_New(BarObject, &BarObject_Type);
bar->dict = PyDict_New();
PyObject_SetAttrString((PyObject*)bar, "none", Py_None);