small int clarification

rasbt · rasbt · commit 5d040cc0768e · 2014-04-16T12:45:52.000-04:00
diff --git a/.ipynb_checkpoints/not_so_obvious_python_stuff-checkpoint.ipynb b/.ipynb_checkpoints/not_so_obvious_python_stuff-checkpoint.ipynb
@@ -1,7 +1,7 @@
 {
  "metadata": {
   "name": "",
-  "signature": "sha256:161acdaa5124ca9e1082a3b0564e8792f64364ea91cd2cff096fdbbff37408ca"
+  "signature": "sha256:e20426bb66111696c7ec4f8d754946061e129b3e332a6cc2fd00331b9540d8c5"
  },
  "nbformat": 3,
  "nbformat_minor": 0,
@@ -212,7 +212,9 @@
       "<a name='python_small_int'></a>\n",
       "## Python reuses objects for small integers - always use \"==\" for equality, \"is\" for identity\n",
       "\n",
-      "This oddity occurs, because Python tends to stores small integers as the same object, but not so for larger ones!  \n",
+      "This oddity occurs, because Python keeps an array of small integer objects (i.e., integers between -5 and 256, [see the doc](https://docs.python.org/2/c-api/int.html#PyInt_FromLong)).\n",
+      "\n",
+      "\n",
       "(*I received a comment that this is in fact a CPython artefact and must not necessarily be true in all implementations of Python!*)\n",
       "\n",
       "So the take home message is: always use \"==\" for equality, \"is\" for identity!\n",
diff --git a/not_so_obvious_python_stuff.ipynb b/not_so_obvious_python_stuff.ipynb
@@ -1,7 +1,7 @@
 {
  "metadata": {
   "name": "",
-  "signature": "sha256:161acdaa5124ca9e1082a3b0564e8792f64364ea91cd2cff096fdbbff37408ca"
+  "signature": "sha256:e20426bb66111696c7ec4f8d754946061e129b3e332a6cc2fd00331b9540d8c5"
  },
  "nbformat": 3,
  "nbformat_minor": 0,
@@ -212,7 +212,9 @@
       "<a name='python_small_int'></a>\n",
       "## Python reuses objects for small integers - always use \"==\" for equality, \"is\" for identity\n",
       "\n",
-      "This oddity occurs, because Python tends to stores small integers as the same object, but not so for larger ones!  \n",
+      "This oddity occurs, because Python keeps an array of small integer objects (i.e., integers between -5 and 256, [see the doc](https://docs.python.org/2/c-api/int.html#PyInt_FromLong)).\n",
+      "\n",
+      "\n",
       "(*I received a comment that this is in fact a CPython artefact and must not necessarily be true in all implementations of Python!*)\n",
       "\n",
       "So the take home message is: always use \"==\" for equality, \"is\" for identity!\n",
