Using ContextDecorator with a lambda.ipynb

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      "cell_type": "code",
      "source": "from IPython.display import display\nfrom contextlib import ContextDecorator\n\nclass mycontext(ContextDecorator):\n    def __enter__(self):\n        display('Starting')\n        return self\n\n    def __exit__(self, *exc):\n        display('Finishing')\n        return False",
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      "cell_type": "code",
      "source": "with mycontext():\n    display('The bit in the middle')",
      "execution_count": 2,
      "outputs": [
        {
          "output_type": "display_data",
          "data": {
            "text/plain": "'Starting'"
          },
          "metadata": {}
        },
        {
          "output_type": "display_data",
          "data": {
            "text/plain": "'The bit in the middle'"
          },
          "metadata": {}
        },
        {
          "output_type": "display_data",
          "data": {
            "text/plain": "'Finishing'"
          },
          "metadata": {}
        }
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      },
      "cell_type": "code",
      "source": "@mycontext()\ndef function():\n    display('The bit in the middle')\n    \nfunction()",
      "execution_count": 3,
      "outputs": [
        {
          "output_type": "display_data",
          "data": {
            "text/plain": "'Starting'"
          },
          "metadata": {}
        },
        {
          "output_type": "display_data",
          "data": {
            "text/plain": "'The bit in the middle'"
          },
          "metadata": {}
        },
        {
          "output_type": "display_data",
          "data": {
            "text/plain": "'Finishing'"
          },
          "metadata": {}
        }
      ]
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    {
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        "trusted": true,
        "collapsed": false
      },
      "cell_type": "code",
      "source": "mycontext()(lambda: display('The bit in the middle'))()",
      "execution_count": 4,
      "outputs": [
        {
          "output_type": "display_data",
          "data": {
            "text/plain": "'Starting'"
          },
          "metadata": {}
        },
        {
          "output_type": "display_data",
          "data": {
            "text/plain": "'The bit in the middle'"
          },
          "metadata": {}
        },
        {
          "output_type": "display_data",
          "data": {
            "text/plain": "'Finishing'"
          },
          "metadata": {}
        }
      ]
    }
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