Added comments before recently added/assigned slots in the type object,
so the backward compatibility issues will be easier to understand. I only
added comments indicating additions and assignments back to Python 2.0.
diff --git a/Include/object.h b/Include/object.h
index 18bc34f..8da524b 100644
--- a/Include/object.h
+++ b/Include/object.h
@@ -150,6 +150,7 @@
unaryfunc nb_float;
unaryfunc nb_oct;
unaryfunc nb_hex;
+ /* Added in release 2.0 */
binaryfunc nb_inplace_add;
binaryfunc nb_inplace_subtract;
binaryfunc nb_inplace_multiply;
@@ -162,6 +163,7 @@
binaryfunc nb_inplace_xor;
binaryfunc nb_inplace_or;
+ /* Added in release 2.2 */
/* The following require the Py_TPFLAGS_HAVE_CLASS flag */
binaryfunc nb_floor_divide;
binaryfunc nb_true_divide;
@@ -178,6 +180,7 @@
intobjargproc sq_ass_item;
intintobjargproc sq_ass_slice;
objobjproc sq_contains;
+ /* Added in release 2.0 */
binaryfunc sq_inplace_concat;
intargfunc sq_inplace_repeat;
} PySequenceMethods;
@@ -250,18 +253,21 @@
char *tp_doc; /* Documentation string */
+ /* Assigned meaning in release 2.0 */
/* call function for all accessible objects */
traverseproc tp_traverse;
/* delete references to contained objects */
inquiry tp_clear;
+ /* Assigned meaning in release 2.1 */
/* rich comparisons */
richcmpfunc tp_richcompare;
/* weak reference enabler */
long tp_weaklistoffset;
+ /* Added in release 2.2 */
/* Iterators */
getiterfunc tp_iter;
iternextfunc tp_iternext;