Project_1B_ETL.ipynb

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   "source": [
    "# Import Python packages \n",
    "import pandas as pd\n",
    "import cassandra\n",
    "import re\n",
    "import os\n",
    "import glob\n",
    "import numpy as np\n",
    "import json\n",
    "import csv"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {
    "editable": true
   },
   "outputs": [],
   "source": [
    "def gather_data():\n",
    "    \"\"\"\n",
    "    Description: This function gathers events data from \"/home/workspace/event_data/\" \n",
    "    directory. Gathered data saved into the DataFrames. Logs entries associated with \n",
    "    \"NextSong\" are selected for further transformations. \n",
    "    \n",
    "    Arguments:\n",
    "        None\n",
    "\n",
    "    Returns:\n",
    "        songs_lib_raw: is the DataFrame that containes songs play history.\n",
    "    \"\"\"\n",
    "\n",
    "    filepath = os.getcwd() + '/event_data'\n",
    "    csv_pattern = os.path.join(filepath,'*.csv')\n",
    "    file_list = sorted(glob.glob(csv_pattern))\n",
    "    \n",
    "    dfs = []\n",
    "    for file in file_list:\n",
    "        data = pd.read_csv(file, encoding = 'utf8')\n",
    "        dfs.append(data)\n",
    "    df_playlogs = pd.concat(dfs, ignore_index=True) # (8056, 18)\n",
    "    songs_lib_raw_ = df_playlogs.loc[df_playlogs[\"page\"] == \"NextSong\"].reset_index(drop=True) # (6820, 17)\n",
    "    songs_lib_raw = songs_lib_raw_[['artist','firstName','gender','itemInSession','lastName',\n",
    "                                    'length','level','location','sessionId','song','userId']] #(6820, 11)\n",
    "    return songs_lib_raw\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {
    "editable": true
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    {
     "data": {
      "text/html": [
       "<div>\n",
       "<style scoped>\n",
       "    .dataframe tbody tr th:only-of-type {\n",
       "        vertical-align: middle;\n",
       "    }\n",
       "\n",
       "    .dataframe tbody tr th {\n",
       "        vertical-align: top;\n",
       "    }\n",
       "\n",
       "    .dataframe thead th {\n",
       "        text-align: right;\n",
       "    }\n",
       "</style>\n",
       "<table border=\"1\" class=\"dataframe\">\n",
       "  <thead>\n",
       "    <tr style=\"text-align: right;\">\n",
       "      <th></th>\n",
       "      <th>artist</th>\n",
       "      <th>firstName</th>\n",
       "      <th>gender</th>\n",
       "      <th>itemInSession</th>\n",
       "      <th>lastName</th>\n",
       "      <th>length</th>\n",
       "      <th>level</th>\n",
       "      <th>location</th>\n",
       "      <th>sessionId</th>\n",
       "      <th>song</th>\n",
       "      <th>userId</th>\n",
       "    </tr>\n",
       "  </thead>\n",
       "  <tbody>\n",
       "    <tr>\n",
       "      <th>0</th>\n",
       "      <td>Des'ree</td>\n",
       "      <td>Kaylee</td>\n",
       "      <td>F</td>\n",
       "      <td>1</td>\n",
       "      <td>Summers</td>\n",
       "      <td>246.30812</td>\n",
       "      <td>free</td>\n",
       "      <td>Phoenix-Mesa-Scottsdale, AZ</td>\n",
       "      <td>139</td>\n",
       "      <td>You Gotta Be</td>\n",
       "      <td>8.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>1</th>\n",
       "      <td>Mr Oizo</td>\n",
       "      <td>Kaylee</td>\n",
       "      <td>F</td>\n",
       "      <td>3</td>\n",
       "      <td>Summers</td>\n",
       "      <td>144.03873</td>\n",
       "      <td>free</td>\n",
       "      <td>Phoenix-Mesa-Scottsdale, AZ</td>\n",
       "      <td>139</td>\n",
       "      <td>Flat 55</td>\n",
       "      <td>8.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>2</th>\n",
       "      <td>Tamba Trio</td>\n",
       "      <td>Kaylee</td>\n",
       "      <td>F</td>\n",
       "      <td>4</td>\n",
       "      <td>Summers</td>\n",
       "      <td>177.18812</td>\n",
       "      <td>free</td>\n",
       "      <td>Phoenix-Mesa-Scottsdale, AZ</td>\n",
       "      <td>139</td>\n",
       "      <td>Quem Quiser Encontrar O Amor</td>\n",
       "      <td>8.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>3</th>\n",
       "      <td>The Mars Volta</td>\n",
       "      <td>Kaylee</td>\n",
       "      <td>F</td>\n",
       "      <td>5</td>\n",
       "      <td>Summers</td>\n",
       "      <td>380.42077</td>\n",
       "      <td>free</td>\n",
       "      <td>Phoenix-Mesa-Scottsdale, AZ</td>\n",
       "      <td>139</td>\n",
       "      <td>Eriatarka</td>\n",
       "      <td>8.0</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>4</th>\n",
       "      <td>Infected Mushroom</td>\n",
       "      <td>Kaylee</td>\n",
       "      <td>F</td>\n",
       "      <td>6</td>\n",
       "      <td>Summers</td>\n",
       "      <td>440.26730</td>\n",
       "      <td>free</td>\n",
       "      <td>Phoenix-Mesa-Scottsdale, AZ</td>\n",
       "      <td>139</td>\n",
       "      <td>Becoming Insane</td>\n",
       "      <td>8.0</td>\n",
       "    </tr>\n",
       "  </tbody>\n",
       "</table>\n",
       "</div>"
      ],
      "text/plain": [
       "              artist firstName gender  itemInSession lastName     length  \\\n",
       "0            Des'ree    Kaylee      F              1  Summers  246.30812   \n",
       "1            Mr Oizo    Kaylee      F              3  Summers  144.03873   \n",
       "2         Tamba Trio    Kaylee      F              4  Summers  177.18812   \n",
       "3     The Mars Volta    Kaylee      F              5  Summers  380.42077   \n",
       "4  Infected Mushroom    Kaylee      F              6  Summers  440.26730   \n",
       "\n",
       "  level                     location  sessionId                          song  \\\n",
       "0  free  Phoenix-Mesa-Scottsdale, AZ        139                  You Gotta Be   \n",
       "1  free  Phoenix-Mesa-Scottsdale, AZ        139                       Flat 55   \n",
       "2  free  Phoenix-Mesa-Scottsdale, AZ        139  Quem Quiser Encontrar O Amor   \n",
       "3  free  Phoenix-Mesa-Scottsdale, AZ        139                     Eriatarka   \n",
       "4  free  Phoenix-Mesa-Scottsdale, AZ        139               Becoming Insane   \n",
       "\n",
       "   userId  \n",
       "0     8.0  \n",
       "1     8.0  \n",
       "2     8.0  \n",
       "3     8.0  \n",
       "4     8.0  "
      ]
     },
     "execution_count": 3,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "songs_lib_raw = gather_data()\n",
    "songs_lib_raw.head()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {
    "editable": true
   },
   "outputs": [],
   "source": [
    "# establish connection to a Cassandra instance\n",
    "from cassandra.cluster import Cluster\n",
    "try: \n",
    "    cluster = Cluster(['127.0.0.1']) \n",
    "    session = cluster.connect()\n",
    "except Exception as e:\n",
    "    print(e)\n",
    "    \n",
    "# create the KEYSPACE udacity\n",
    "try:\n",
    "    session.execute(\"\"\"\n",
    "    CREATE KEYSPACE IF NOT EXISTS udacity \n",
    "    WITH REPLICATION = \n",
    "    { 'class' : 'SimpleStrategy', 'replication_factor' : 1 }\"\"\"\n",
    ")\n",
    "except Exception as e:\n",
    "    print(e)\n",
    "    \n",
    "# Set KEYSPACE to the keyspace udacity\n",
    "try:\n",
    "    session.set_keyspace('udacity')\n",
    "except Exception as e:\n",
    "    print(e)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {
    "editable": true
   },
   "source": [
    "The PRIMARY KEY in the table **song_library** consists of two fields sessionId (Partition key) and itemInSession (Clustering key). Partitioning is done by **sessionId**. Withing that partition the rows are ordered by the **itemInSession**."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {
    "editable": true
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "CPU times: user 6.72 s, sys: 909 ms, total: 7.62 s\n",
      "Wall time: 12.7 s\n"
     ]
    }
   ],
   "source": [
    "%%time\n",
    "# Create table \"song_library\" and insert the values\n",
    "query = \"CREATE TABLE IF NOT EXISTS song_library \" \n",
    "query = query + \"(sessionId int, itemInSession int, artist text, song text, length decimal, PRIMARY KEY (sessionId, itemInSession))\"\n",
    "try:\n",
    "    session.execute(query)\n",
    "except Exception as e:\n",
    "    print(e)                    \n",
    "\n",
    "for index, row in songs_lib_raw.iterrows():\n",
    "    query = \"INSERT INTO song_library (sessionId, itemInSession, artist, song, length)\"\n",
    "    query = query + \"VALUES (%s, %s, %s, %s, %s)\"\n",
    "    session.execute(query, (int(row[\"sessionId\"]), int(row[\"itemInSession\"]), row[\"artist\"], row[\"song\"], float(row[\"length\"])))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {
    "editable": true
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Faithless Music Matters (Mark Knight Dub) 495.3073\n"
     ]
    }
   ],
   "source": [
    "## Query 1:  Give me the artist, song title and song's length in the music app history that was heard during \\\n",
    "## sessionId = 338, and itemInSession = 4 \n",
    "\n",
    "query = \"SELECT artist, song, length FROM song_library WHERE sessionId=338 AND itemInSession=4\"\n",
    "try:\n",
    "    rows = session.execute(query)\n",
    "except Exception as e:\n",
    "    print(e)\n",
    "    \n",
    "for row in rows:\n",
    "    print (row.artist, row.song, row.length)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {
    "editable": true
   },
   "source": [
    "The PRIMARY KEY in the table **song_playlist_session**  consists of composite partition keys (**userId** and **sessionId**), and Clustering key **itemInSession**. Partitioning is done by **userId** and **sessionId**. Withing the partition rows are ordered by **itemInSession**."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {
    "editable": true
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Down To The Bone Keep On Keepin' On Sylvie Cruz\n",
      "Three Drives Greece 2000 Sylvie Cruz\n",
      "Sebastien Tellier Kilometer Sylvie Cruz\n",
      "Lonnie Gordon Catch You Baby (Steve Pitron & Max Sanna Radio Edit) Sylvie Cruz\n",
      "CPU times: user 7.55 s, sys: 875 ms, total: 8.43 s\n",
      "Wall time: 14 s\n"
     ]
    }
   ],
   "source": [
    "%%time\n",
    "# Create table \"song_playlist_session\" and insert the values\n",
    "query = \"CREATE TABLE IF NOT EXISTS song_playlist_session \"\n",
    "query = query + \"(userId int, sessionId int, itemInSession int, artist text, song text, firstName text, lastName text, PRIMARY KEY ((userId, sessionId), itemInSession))\"\n",
    "try:\n",
    "    session.execute(query)\n",
    "except Exception as e:\n",
    "    print(e)                    \n",
    "\n",
    "for index, row in songs_lib_raw.iterrows():\n",
    "    query = \"INSERT INTO song_playlist_session (userId, sessionId, itemInSession, artist, song, firstName, lastName)\"\n",
    "    query = query + \"VALUES (%s, %s, %s, %s, %s, %s, %s)\"\n",
    "    session.execute(query, (int(row[\"userId\"]), int(row[\"sessionId\"]), int(row[\"itemInSession\"]), row[\"artist\"], row[\"song\"], row[\"firstName\"], row[\"lastName\"]))\n",
    "\n",
    "## Query 2: Give me only the following: name of artist, song (sorted by itemInSession) and user (first and last name)\\\n",
    "## for userid = 10, sessionid = 182\n",
    "query = \"SELECT artist, song, firstName, lastName FROM song_playlist_session WHERE userId=10 AND sessionId=182\"\n",
    "try:\n",
    "    rows = session.execute(query)\n",
    "except Exception as e:\n",
    "    print(e)\n",
    "    \n",
    "for row in rows:\n",
    "    print (row.artist, row.song, row.firstname, row.lastname)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {
    "editable": true
   },
   "source": [
    "The PRIMARY KEY in the table **songs_by_users** consists of two fields song (Partition key) and userId (Clustering key). Partitioning is done by **song**. Withing that partition the rows are ordered by the **userId**."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {
    "editable": true
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Jacqueline Lynch\n",
      "Tegan Levine\n",
      "Sara Johnson\n",
      "CPU times: user 6.47 s, sys: 890 ms, total: 7.36 s\n",
      "Wall time: 12.3 s\n"
     ]
    }
   ],
   "source": [
    "%%time\n",
    "# Create table \"songs_by_users\" and insert the values\n",
    "query = \"CREATE TABLE IF NOT EXISTS songs_by_users \" \n",
    "query = query + \"(song text, userId int, firstName text, lastName text, PRIMARY KEY (song, userId))\"\n",
    "try:\n",
    "    session.execute(query)\n",
    "except Exception as e:\n",
    "    print(e)                    \n",
    "\n",
    "for index, row in songs_lib_raw.iterrows():\n",
    "    query = \"INSERT INTO songs_by_users (song, userId, firstName, lastName)\"\n",
    "    query = query + \"VALUES (%s, %s, %s, %s)\"\n",
    "    session.execute(query, (row[\"song\"], int(row[\"userId\"]), row[\"firstName\"], row[\"lastName\"]))\n",
    "\n",
    "# Query 3: Give me every user name (first and last) in my music app history who listened to the song 'All Hands Against His Own'\n",
    "query = \"SELECT firstName, lastName FROM songs_by_users WHERE song='All Hands Against His Own' \"\n",
    "try:\n",
    "    rows = session.execute(query)\n",
    "except Exception as e:\n",
    "    print(e)\n",
    "    \n",
    "for row in rows:\n",
    "    print (row.firstname, row.lastname)\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "metadata": {
    "editable": true
   },
   "outputs": [],
   "source": [
    "# Drop the table before closing out the sessions\n",
    "query = \"drop table song_library\"\n",
    "try:\n",
    "    rows = session.execute(query)\n",
    "except Exception as e:\n",
    "    print(e)\n",
    "\n",
    "query = \"drop table song_playlist_session\"\n",
    "try:\n",
    "    rows = session.execute(query)\n",
    "except Exception as e:\n",
    "    print(e)\n",
    "\n",
    "query = \"drop table songs_by_users\"\n",
    "try:\n",
    "    rows = session.execute(query)\n",
    "except Exception as e:\n",
    "    print(e)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "metadata": {
    "editable": true
   },
   "outputs": [],
   "source": [
    "# Close the session and cluster connection\n",
    "session.shutdown()\n",
    "cluster.shutdown()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "editable": true
   },
   "outputs": [],
   "source": []
  }
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