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   "source": [
    "import xml.etree.cElementTree as ElementTree\n",
    "import bz2\n",
    "import re\n",
    "\n",
    "inputfile = 'ptwikibooks-latest-flow.xml.bz2'\n",
    "ns = 'http://www.mediawiki.org/xml/flow-1.0/'\n",
    "\n",
    "bracketed_ns = '{%s}' % (ns,)\n",
    "\n",
    "def tag( name ):\n",
    "    return f'{ bracketed_ns }{name}'\n",
    "\n",
    "def bare_tag( ns_tag ):\n",
    "    return ns_tag.replace( bracketed_ns, '' )\n",
    "\n",
    "def readStream( xmlfile ):\n",
    "    with bz2.open( xmlfile, 'rb' ) as file:\n",
    "        for ( event, element ) in ElementTree.iterparse( file, events=[ 'start', 'end' ] ):\n",
    "            yield ( event, element )\n",
    "\n",
    "def readTagStream( stream, tags ):\n",
    "    reference_counter = 0\n",
    "    for ( event, element ) in stream:\n",
    "        if ( event == 'start' ):\n",
    "            if ( bare_tag( element.tag ) in tags ):\n",
    "                reference_counter += 1\n",
    "        elif ( event == 'end' ):\n",
    "            if ( bare_tag( element.tag ) in tags ):\n",
    "                yield element\n",
    "                reference_counter -= 1\n",
    "            assert( reference_counter >= 0)\n",
    "            if reference_counter == 0:\n",
    "                element.clear()\n",
    "                pass\n",
    "\n",
    "stream = readTagStream( readStream( inputfile ), [ 'topic' ] )\n",
    "topics = ( e.get( 'id' ) for e in stream )\n",
    "\n",
    "with open( 'topics.txt', 'w' ) as file:\n",
    "    for topic in topics:\n",
    "        file.write( topic )\n",
    "        file.write( '\\n' )"
   ]
  }
 ],
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