Function PyArray_FromAny_int

numpy/core/src/multiarray/ctors.c:1531–1713

 */

NPY_NO_EXPORT PyObject *
PyArray_FromAny_int(PyObject *op, PyArray_Descr *in_descr,
                    PyArray_DTypeMeta *in_DType, int min_depth, int max_depth,
                    int flags, PyObject *context)
{
    /*
     * This is the main code to make a NumPy array from a Python
     * Object.  It is called from many different places.
     */
    PyArrayObject *arr = NULL, *ret;
    PyArray_Descr *dtype = NULL;
    coercion_cache_obj *cache = NULL;
    int ndim = 0;
    npy_intp dims[NPY_MAXDIMS];

    if (context != NULL) {
        PyErr_SetString(PyExc_RuntimeError, "'context' must be NULL");
        return NULL;
    }

    ndim = PyArray_DiscoverDTypeAndShape(op,
            NPY_MAXDIMS, dims, &cache, in_DType, in_descr, &dtype,
            flags & NPY_ARRAY_ENSURENOCOPY);

    if (ndim < 0) {
        return NULL;
    }

    if (dtype == NULL) {
        dtype = PyArray_DescrFromType(NPY_DEFAULT_TYPE);
    }

    if (min_depth != 0 && ndim < min_depth) {
        PyErr_SetString(PyExc_ValueError,
                "object of too small depth for desired array");
        Py_DECREF(dtype);
        npy_free_coercion_cache(cache);
        return NULL;
    }
    if (max_depth != 0 && ndim > max_depth) {
        PyErr_SetString(PyExc_ValueError,
                "object too deep for desired array");
        Py_DECREF(dtype);
        npy_free_coercion_cache(cache);
        return NULL;
    }

    /* Got the correct parameters, but the cache may already hold the result */
    if (cache != NULL && !(cache->sequence)) {
        /*
         * There is only a single array-like and it was converted, it
         * may still have the incorrect type, but that is handled below.
         */
        assert(cache->converted_obj == op);
        arr = (PyArrayObject *)(cache->arr_or_sequence);
        /* we may need to cast or assert flags (e.g. copy) */
        PyObject *res = PyArray_FromArray(arr, dtype, flags);
        npy_unlink_coercion_cache(cache);