Function PyArray_FromInterface

numpy/core/src/multiarray/ctors.c:2107–2376

NUMPY_API*/

/*NUMPY_API*/
NPY_NO_EXPORT PyObject *
PyArray_FromInterface(PyObject *origin)
{
    PyObject *iface = NULL;
    PyObject *attr = NULL;
    PyObject *base = NULL;
    PyArrayObject *ret;
    PyArray_Descr *dtype = NULL;
    char *data = NULL;
    Py_buffer view;
    int i, n;
    npy_intp dims[NPY_MAXDIMS], strides[NPY_MAXDIMS];
    int dataflags = NPY_ARRAY_BEHAVED;

    iface = PyArray_LookupSpecial_OnInstance(origin, npy_ma_str_array_interface);

    if (iface == NULL) {
        if (PyErr_Occurred()) {
            return NULL;
        }
        return Py_NotImplemented;
    }
    if (!PyDict_Check(iface)) {
        if (PyType_Check(origin) && PyObject_HasAttrString(iface, "__get__")) {
            /*
             * If the input is a class `iface` should be a property-like object.
             * This cannot be interpreted as an array, but is a valid.
             * (Needed due to the lookup being on the instance rather than type)
             */
            Py_DECREF(iface);
            return Py_NotImplemented;
        }

        Py_DECREF(iface);
        PyErr_SetString(PyExc_ValueError,
                "Invalid __array_interface__ value, must be a dict");
        return NULL;
    }

    /* Get type string from interface specification */
    attr = _PyDict_GetItemStringWithError(iface, "typestr");
    if (attr == NULL) {
        Py_DECREF(iface);
        if (!PyErr_Occurred()) {
            PyErr_SetString(PyExc_ValueError,
                    "Missing __array_interface__ typestr");
        }
        return NULL;
    }

    /* allow bytes for backwards compatibility */
    if (!PyBytes_Check(attr) && !PyUnicode_Check(attr)) {
        PyErr_SetString(PyExc_TypeError,
                    "__array_interface__ typestr must be a string");
        goto fail;
    }

    /* Get dtype from type string */