what does is ?

[Martin v. Löwis]

Gerhard Häring <gerhard.haering at opus-gmbh.net> writes:

> But it seems to me that the [:] slicing has an additional
> optimization, apart from interning.

Indeed; this is the code

	if (i == 0 && j == a->ob_size && PyString_CheckExact(a)) {
		/* It's the same as a */
		Py_INCREF(a);
		return (PyObject *)a;
	}

Notice that this optimization is only valid for immutable sequences;
this specific code is for strings.

Regards,
Martin