STINNER Victor <vstin...@python.org> added the comment:
Py_buffer.shape requires a Py_ssize_t* pointer. It's not convenient. For
example, the array module uses:
static int
array_buffer_getbuf(arrayobject *self, Py_buffer *view, int flags)
{
...
if ((flags & PyBUF_ND)==PyBUF_ND) {
view->shape = &((PyVarObject*)self)->ob_size;
}
...
return 0;
}
This code is not compatible with a fully opaque PyObject structure:
https://bugs.python.org/issue39573#msg401395
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue45459>
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