这可以这样做：

1.从Python转换为C

如果你真的意味着无效*这将是：

some_pyobj = "abc"

cdef void *ptr

ptr = some_pyobj

如果你的意思是PyObject *,那将是：

cdef PyObject *ptr

ptr = some_pyobj # Cast from Python object to C pointer

然后,从C侧,PyObject结构可以通过包含Python.h来获得.

这是引用(来自object.h Python包含文件)：

/* Nothing is actually declared to be a PyObject, but every pointer to

* a Python object can be cast to a PyObject*. This is inheritance built

* by hand. Similarly every pointer to a variable-size Python object can,

* in addition, be cast to PyVarObject*.

*/

typedef struct _object {

PyObject_HEAD

} PyObject;

2.从C转换为Python

它以两种方式工作,这意味着以下也是可能的：

cdef PyObject *ptr

ptr = some_pyobj

cdef object some_other_pyobj

some_other_pyobj = ptr # Cast from C pointer to Python object