WidgetFailure.ipynb

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     "text": [
      ":0: FutureWarning: IPython widgets are experimental and may change in the future.\n"
     ]
    }
   ],
   "source": [
    "from IPython.html.widgets import FloatText, FloatSlider, Button\n",
    "from IPython.display import display\n",
    "from IPython.utils.traitlets import link\n",
    "\n",
    "widgets = []\n",
    "for x in list('abcdef'):\n",
    "    widgets.append(FloatText(description=x))\n",
    "\n",
    "a = FloatSlider()\n",
    "b = FloatSlider()\n",
    "\n",
    "link((a, 'value'), (b, 'value'))\n",
    "\n",
    "threads = []\n",
    "def go(sender):\n",
    "    def thread_code():\n",
    "        from time import sleep\n",
    "        from random import random\n",
    "        while len(threads) > 0:\n",
    "            for w in widgets:\n",
    "                w.value = random()\n",
    "            sleep(0.01)\n",
    "    from threading import Thread\n",
    "    thread = Thread(target=thread_code)\n",
    "    threads.append(thread)\n",
    "    thread.start()\n",
    "go_btn = Button(description=\"Go!\")\n",
    "go_btn.on_click(go)\n",
    "\n",
    "def stop(sender):\n",
    "    del threads[:]\n",
    "stop_btn = Button(description=\"Stop\")\n",
    "stop_btn.on_click(stop)\n",
    "\n",
    "display(*widgets)\n",
    "display(a,b)\n",
    "display(go_btn)\n",
    "display(stop_btn)"
   ]
  }
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