Improve examples

Author: gjbex

hands-on/compressed_files.ipynb

@@ -312,7 +312,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.7.0"
+   "version": "3.7.5"
   }
  },
  "nbformat": 4,

hands-on/filesystem_interaction.ipynb

@@ -9,7 +9,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 1,
    "metadata": {
     "ExecuteTime": {
      "end_time": "2018-11-14T08:44:12.881704Z",
@@ -49,18 +49,30 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 3,
    "metadata": {
     "ExecuteTime": {
      "end_time": "2018-11-13T12:13:11.498841Z",
      "start_time": "2018-11-13T12:13:11.483568Z"
     },
     "hidden": true
    },
-   "outputs": [],
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "shell_interaction.ipynb: 13615 bytes, last accessed: 2019-12-03 07:18:08\n",
+      "system_information.ipynb: 8870 bytes, last accessed: 2019-12-03 06:59:53\n",
+      "compressed_files.ipynb: 7857 bytes, last accessed: 2019-11-22 06:48:58\n",
+      "julia.ipynb: 5311 bytes, last accessed: 2019-12-03 07:54:28\n",
+      "filesystem_interaction.ipynb: 18180 bytes, last accessed: 2019-12-03 07:57:53\n"
+     ]
+    }
+   ],
    "source": [
     "for item in Path.cwd().iterdir():\n",
-    "    if item.is_file() and item.name.endswith('.py'):\n",
+    "    if item.is_file() and item.name.endswith('.ipynb'):\n",
     "        lstat = item.lstat()\n",
     "        access_time = datetime.strftime(datetime.fromtimestamp(lstat.st_atime),\n",
     "                                        '%Y-%m-%d %H:%M:%S')\n",
@@ -794,7 +806,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.7.0"
+   "version": "3.7.5"
   }
  },
  "nbformat": 4,

hands-on/julia.ipynb

@@ -243,7 +243,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.7.0"
+   "version": "3.7.5"
   }
  },
  "nbformat": 4,