fix error example and add some examples

sunnyanthony · sunnyanthony · commit d1bf05b762da · 2022-08-17T20:06:01.000+08:00
diff --git a/ipythons/Strain_your_brain.ipynb b/ipythons/Strain_your_brain.ipynb
@@ -757,10 +757,11 @@
    "metadata": {},
    "outputs": [],
    "source": [
+    "ordered_dict =  OrderedDictWithHash(ordered_dict)\n",
+    "another_ordered_dict = OrderedDictWithHash(another_ordered_dict)\n",
     "another_set = set()\n",
     "another_set.add(ordered_dict)\n",
-    "another_ordered_dict in another_set\n",
-    "=> False"
+    "another_ordered_dict in another_set"
    ]
   },
   {
@@ -866,6 +867,102 @@
     "    print(f\"Zero division error occurred: {e}\")"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "### For what?"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "some_string = \"wtf\"\n",
+    "some_dict = {}\n",
+    "for i, some_dict[i] in enumerate(some_string):\n",
+    "    i = 10"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "some_dict"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "i, some_dict[i] = (0, 'w')\n",
+    "i, some_dict[i] = (1, 't')\n",
+    "i, some_dict[i] = (2, 'f')\n",
+    "some_dict"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "### Evaluation time discrepancy"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "array = [1, 8, 15]\n",
+    "# A typical generator expression\n",
+    "gen = (x for x in array if array.count(x) > 0)\n",
+    "array = [2, 8, 22]\n",
+    "print(list(gen))\n",
+    "print(type(gen))"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "array_1 = [1,2,3,4]\n",
+    "gen_1 = (x for x in array_1)\n",
+    "array_1 = [1,2,3,4,5]\n",
+    "\n",
+    "array_2 = [1,2,3,4]\n",
+    "gen_2 = (x for x in array_2)\n",
+    "array_2[:] = [1,2,3,4,5]\n",
+    "\n",
+    "print(list(gen_1))\n",
+    "\n",
+    "print(list(gen_2))"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "array_3 = [1, 2, 3]\n",
+    "array_4 = [10, 20, 30]\n",
+    "gen = (i + j for i in array_3 for j in array_4)\n",
+    "\n",
+    "array_3 = [4, 5, 6]\n",
+    "array_4 = [400, 500, 600]\n",
+    "\n",
+    "print(list(gen))"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": null,
