langchain/docs/extras/integrations/document_loaders/epub.ipynb

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   "source": [
    "# EPub \n",
    "\n",
    ">[EPUB](https://en.wikipedia.org/wiki/EPUB) is an e-book file format that uses the \".epub\" file extension. The term is short for electronic publication and is sometimes styled ePub. `EPUB` is supported by many e-readers, and compatible software is available for most smartphones, tablets, and computers.\n",
    "\n",
    "This covers how to load `.epub` documents into the Document format that we can use downstream. You'll need to install the [`pandoc`](https://pandoc.org/installing.html) package for this loader to work."
   ]
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   "id": "cd1affad-8ba6-43b1-b8cd-f61f44025077",
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   "source": [
    "#!pip install pandoc"
   ]
  },
  {
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   "execution_count": 1,
   "id": "721c48aa",
   "metadata": {
    "tags": []
   },
   "outputs": [],
   "source": [
    "from langchain.document_loaders import UnstructuredEPubLoader"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "id": "9d3d0e35",
   "metadata": {
    "tags": []
   },
   "outputs": [],
   "source": [
    "loader = UnstructuredEPubLoader(\"winter-sports.epub\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "06073f91",
   "metadata": {
    "tags": []
   },
   "outputs": [],
   "source": [
    "data = loader.load()"
   ]
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   "cell_type": "markdown",
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   "source": [
    "## Retain Elements\n",
    "\n",
    "Under the hood, Unstructured creates different \"elements\" for different chunks of text. By default we combine those together, but you can easily keep that separation by specifying `mode=\"elements\"`."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "id": "064f9162",
   "metadata": {
    "tags": []
   },
   "outputs": [],
   "source": [
    "loader = UnstructuredEPubLoader(\"winter-sports.epub\", mode=\"elements\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "abefbbdb",
   "metadata": {
    "tags": []
   },
   "outputs": [],
   "source": [
    "data = loader.load()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "id": "a547c534",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "Document(page_content='The Project Gutenberg eBook of Winter Sports in\\nSwitzerland, by E. F. Benson', lookup_str='', metadata={'source': 'winter-sports.epub', 'page_number': 1, 'category': 'Title'}, lookup_index=0)"
      ]
     },
     "execution_count": 6,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "data[0]"
   ]
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   "cell_type": "code",
   "execution_count": null,
   "id": "381d4139",
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