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    "# Appmode in Jupyter\n",
    "\n",
    "This page demonstrates how to generate online \"apps\" with a Jupyter Notebook interface. With the `appmode` plugin, we can create interactive experiences without requiring coding or running a specific cell.\n",
    "\n",
    "Markdown cells will be retained, and all code cells will be run, then hidden. The outputs of each cell will be displayed as well.\n",
    "\n",
    "Check out a further example using an [ipyvolume](https://ipyvolume.readthedocs.io/en/latest/) to render a 3D plot: [ipyvolume_demo.ipynb](ipyvolume_demo.ipynb)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "from __future__ import division\n",
    "import ipywidgets as ipw\n",
    "\n",
    "output = ipw.Text(placeholder=\"0\", layout=ipw.Layout(width=\"190px\"),  disabled=True)\n",
    "\n",
    "def on_click(btn):\n",
    "    if btn.description == \"=\":\n",
    "        try:\n",
    "            output.value = str(eval(output.value))\n",
    "        except:\n",
    "            output.value = \"ERROR\"\n",
    "    elif btn.description == \"AC\":\n",
    "        output.value = \"\"\n",
    "    elif btn.description == \"del\":\n",
    "        output.value = output.value[:-1]\n",
    "    else:\n",
    "        output.value = output.value + btn.description\n",
    "\n",
    "def mk_btn(description):\n",
    "    btn = ipw.Button(description=description, layout=ipw.Layout(width=\"45px\"))\n",
    "    btn.on_click(on_click)\n",
    "    return btn\n",
    "\n",
    "row0 = ipw.HBox([mk_btn(d) for d in (\"(\", \")\", \"del\", \"AC\")])\n",
    "row1 = ipw.HBox([mk_btn(d) for d in (\"7\", \"8\", \"9\", \" / \")])\n",
    "row2 = ipw.HBox([mk_btn(d) for d in (\"4\", \"5\", \"6\", \" * \")])\n",
    "row3 = ipw.HBox([mk_btn(d) for d in (\"1\", \"2\", \"3\", \" - \")])\n",
    "row4 = ipw.HBox([mk_btn(d) for d in (\"0\", \".\", \"=\", \" + \")])\n",
    "ipw.VBox((output, row0, row1, row2, row3, row4))"
   ]
  }
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