02_LibraryPageviews.ipynb

{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Library pageviews data\n",
    "\n",
    "This is data from Google Analytics on a subset of library item web page views from 2012.\n",
    "\n",
    "It has been severely reduced in size so that we can learn more about how to explore using Altair. You can see a version that deals with about a 20x larger subset in the `20_LibraryPageviews.ipynb` in this same repository."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [],
   "source": [
    "import pandas as pd\n",
    "import altair as alt\n",
    "from altair import datum"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Read in library web site page views data\n",
    "\n",
    "The data documents web views of items in the Duke Library catalogue. \n",
    "\n",
    "- Each row documents visitors to a particular item page within an hour during 2012. \n",
    "- Things like the item URL have been stripped out,\n",
    "- but a Library of Congress Category (LCC) has been retained for the item. \n",
    "- The data also includes the rough location of the visitor, and \n",
    "- how may people from that location viewed the page during that hour."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [
    {
     "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>timestamp</th>\n",
       "      <th>visitors</th>\n",
       "      <th>city</th>\n",
       "      <th>region</th>\n",
       "      <th>country</th>\n",
       "      <th>longitude</th>\n",
       "      <th>latitude</th>\n",
       "      <th>lcc_description</th>\n",
       "    </tr>\n",
       "  </thead>\n",
       "  <tbody>\n",
       "    <tr>\n",
       "      <th>0</th>\n",
       "      <td>2012-01-01 16:00:00</td>\n",
       "      <td>1</td>\n",
       "      <td>Montreal</td>\n",
       "      <td>Quebec</td>\n",
       "      <td>Canada</td>\n",
       "      <td>-73.5542</td>\n",
       "      <td>45.5089</td>\n",
       "      <td>Military Science</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>1</th>\n",
       "      <td>2012-01-01 13:00:00</td>\n",
       "      <td>1</td>\n",
       "      <td>Durham</td>\n",
       "      <td>North Carolina</td>\n",
       "      <td>United States</td>\n",
       "      <td>-78.8986</td>\n",
       "      <td>35.9940</td>\n",
       "      <td>History Of The Americas</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>2</th>\n",
       "      <td>2012-01-01 10:00:00</td>\n",
       "      <td>1</td>\n",
       "      <td>Edinburgh</td>\n",
       "      <td>Scotland</td>\n",
       "      <td>United Kingdom</td>\n",
       "      <td>-3.1875</td>\n",
       "      <td>55.9502</td>\n",
       "      <td>Social Sciences</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>3</th>\n",
       "      <td>2012-01-01 18:00:00</td>\n",
       "      <td>1</td>\n",
       "      <td>Plymouth</td>\n",
       "      <td>England</td>\n",
       "      <td>United Kingdom</td>\n",
       "      <td>-4.1427</td>\n",
       "      <td>50.3704</td>\n",
       "      <td>NaN</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>4</th>\n",
       "      <td>2012-01-01 09:00:00</td>\n",
       "      <td>1</td>\n",
       "      <td>Edinburgh</td>\n",
       "      <td>Scotland</td>\n",
       "      <td>United Kingdom</td>\n",
       "      <td>-3.1875</td>\n",
       "      <td>55.9502</td>\n",
       "      <td>Social Sciences</td>\n",
       "    </tr>\n",
       "  </tbody>\n",
       "</table>\n",
       "</div>"
      ],
      "text/plain": [
       "             timestamp  visitors       city          region         country  \\\n",
       "0  2012-01-01 16:00:00         1   Montreal          Quebec          Canada   \n",
       "1  2012-01-01 13:00:00         1     Durham  North Carolina   United States   \n",
       "2  2012-01-01 10:00:00         1  Edinburgh        Scotland  United Kingdom   \n",
       "3  2012-01-01 18:00:00         1   Plymouth         England  United Kingdom   \n",
       "4  2012-01-01 09:00:00         1  Edinburgh        Scotland  United Kingdom   \n",
       "\n",
       "   longitude  latitude          lcc_description  \n",
       "0   -73.5542   45.5089         Military Science  \n",
       "1   -78.8986   35.9940  History Of The Americas  \n",
       "2    -3.1875   55.9502          Social Sciences  \n",
       "3    -4.1427   50.3704                      NaN  \n",
       "4    -3.1875   55.9502          Social Sciences  "
      ]
     },
     "execution_count": 2,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "pageviews = pd.read_csv('data/pageviews_2012_small.csv')\n",
    "pageviews.head()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "10278"
      ]
     },
     "execution_count": 3,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "len(pageviews)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### View the Pandas column data types\n",
    "\n",
    "\"object\" == text string"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "timestamp           object\n",
       "visitors             int64\n",
       "city                object\n",
       "region              object\n",
       "country             object\n",
       "longitude          float64\n",
       "latitude           float64\n",
       "lcc_description     object\n",
       "dtype: object"
      ]
     },
     "execution_count": 4,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "pageviews.dtypes"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Change ISO_time to a true date and time data type\n",
    "\n",
    "Note that the \"timestamp\" column has `dtype=object`. That is the same thing as a text string.\n",
    "\n",
    "**To use the Altair date and time functionality, we need to convert these timestamp strings into Python `datetime` objects.**"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "timestamp          datetime64[ns]\n",
       "visitors                    int64\n",
       "city                       object\n",
       "region                     object\n",
       "country                    object\n",
       "longitude                 float64\n",
       "latitude                  float64\n",
       "lcc_description            object\n",
       "dtype: object"
      ]
     },
     "execution_count": 5,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "pageviews['timestamp'] = pd.to_datetime(pageviews['timestamp'])\n",
    "pageviews.dtypes"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Viewing datetime components\n",
    "\n",
    "- To test that we have a true datetime object, we do one of the Pandas date/time operations on the \"timestamp\" column.\n",
    "- See the [time/date components documentation](https://pandas.pydata.org/pandas-docs/stable/user_guide/timeseries.html#time-date-components) for more details about pulling out pieces of a datetime in Pandas."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "0        2012-01-01\n",
       "1        2012-01-01\n",
       "2        2012-01-01\n",
       "3        2012-01-01\n",
       "4        2012-01-01\n",
       "            ...    \n",
       "10273    2012-12-31\n",
       "10274    2012-12-31\n",
       "10275    2012-12-31\n",
       "10276    2012-12-31\n",
       "10277    2012-12-31\n",
       "Name: timestamp, Length: 10278, dtype: object"
      ]
     },
     "execution_count": 6,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "pageviews['timestamp'].dt.date"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "---\n",
    "\n",
    "## MaxRowsError\n",
    "\n",
    "**This is is the piece I hate this most about using and teaching Altair!**\n",
    "\n",
    "Let's try to do a simple visualization using the pageviews data."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [
    {
     "ename": "MaxRowsError",
     "evalue": "The number of rows in your dataset is greater than the maximum allowed (5000).\n\nSee https://altair-viz.github.io/user_guide/large_datasets.html for information on how to plot large datasets, including how to install third-party data management tools and, in the right circumstance, disable the restriction",
     "output_type": "error",
     "traceback": [
      "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[0;31mMaxRowsError\u001b[0m                              Traceback (most recent call last)",
      "File \u001b[0;32m~/anaconda3/lib/python3.9/site-packages/altair/vegalite/v5/api.py:2520\u001b[0m, in \u001b[0;36mChart.to_dict\u001b[0;34m(self, *args, **kwargs)\u001b[0m\n\u001b[1;32m   2518\u001b[0m     copy\u001b[38;5;241m.\u001b[39mdata \u001b[38;5;241m=\u001b[39m core\u001b[38;5;241m.\u001b[39mInlineData(values\u001b[38;5;241m=\u001b[39m[{}])\n\u001b[1;32m   2519\u001b[0m     \u001b[38;5;28;01mreturn\u001b[39;00m \u001b[38;5;28msuper\u001b[39m(Chart, copy)\u001b[38;5;241m.\u001b[39mto_dict(\u001b[38;5;241m*\u001b[39margs, \u001b[38;5;241m*\u001b[39m\u001b[38;5;241m*\u001b[39mkwargs)\n\u001b[0;32m-> 2520\u001b[0m \u001b[38;5;28;01mreturn\u001b[39;00m \u001b[38;5;28;43msuper\u001b[39;49m\u001b[43m(\u001b[49m\u001b[43m)\u001b[49m\u001b[38;5;241;43m.\u001b[39;49m\u001b[43mto_dict\u001b[49m\u001b[43m(\u001b[49m\u001b[38;5;241;43m*\u001b[39;49m\u001b[43margs\u001b[49m\u001b[43m,\u001b[49m\u001b[43m \u001b[49m\u001b[38;5;241;43m*\u001b[39;49m\u001b[38;5;241;43m*\u001b[39;49m\u001b[43mkwargs\u001b[49m\u001b[43m)\u001b[49m\n",
      "File \u001b[0;32m~/anaconda3/lib/python3.9/site-packages/altair/vegalite/v5/api.py:838\u001b[0m, in \u001b[0;36mTopLevelMixin.to_dict\u001b[0;34m(self, *args, **kwargs)\u001b[0m\n\u001b[1;32m    836\u001b[0m copy \u001b[38;5;241m=\u001b[39m \u001b[38;5;28mself\u001b[39m\u001b[38;5;241m.\u001b[39mcopy(deep\u001b[38;5;241m=\u001b[39m\u001b[38;5;28;01mFalse\u001b[39;00m)  \u001b[38;5;66;03m# type: ignore[attr-defined]\u001b[39;00m\n\u001b[1;32m    837\u001b[0m original_data \u001b[38;5;241m=\u001b[39m \u001b[38;5;28mgetattr\u001b[39m(copy, \u001b[38;5;124m\"\u001b[39m\u001b[38;5;124mdata\u001b[39m\u001b[38;5;124m\"\u001b[39m, Undefined)\n\u001b[0;32m--> 838\u001b[0m copy\u001b[38;5;241m.\u001b[39mdata \u001b[38;5;241m=\u001b[39m \u001b[43m_prepare_data\u001b[49m\u001b[43m(\u001b[49m\u001b[43moriginal_data\u001b[49m\u001b[43m,\u001b[49m\u001b[43m \u001b[49m\u001b[43mcontext\u001b[49m\u001b[43m)\u001b[49m\n\u001b[1;32m    840\u001b[0m \u001b[38;5;28;01mif\u001b[39;00m original_data \u001b[38;5;129;01mis\u001b[39;00m \u001b[38;5;129;01mnot\u001b[39;00m Undefined:\n\u001b[1;32m    841\u001b[0m     context[\u001b[38;5;124m\"\u001b[39m\u001b[38;5;124mdata\u001b[39m\u001b[38;5;124m\"\u001b[39m] \u001b[38;5;241m=\u001b[39m original_data\n",
      "File \u001b[0;32m~/anaconda3/lib/python3.9/site-packages/altair/vegalite/v5/api.py:100\u001b[0m, in \u001b[0;36m_prepare_data\u001b[0;34m(data, context)\u001b[0m\n\u001b[1;32m     98\u001b[0m \u001b[38;5;66;03m# convert dataframes  or objects with __geo_interface__ to dict\u001b[39;00m\n\u001b[1;32m     99\u001b[0m \u001b[38;5;28;01melif\u001b[39;00m \u001b[38;5;28misinstance\u001b[39m(data, pd\u001b[38;5;241m.\u001b[39mDataFrame) \u001b[38;5;129;01mor\u001b[39;00m \u001b[38;5;28mhasattr\u001b[39m(data, \u001b[38;5;124m\"\u001b[39m\u001b[38;5;124m__geo_interface__\u001b[39m\u001b[38;5;124m\"\u001b[39m):\n\u001b[0;32m--> 100\u001b[0m     data \u001b[38;5;241m=\u001b[39m \u001b[43m_pipe\u001b[49m\u001b[43m(\u001b[49m\u001b[43mdata\u001b[49m\u001b[43m,\u001b[49m\u001b[43m \u001b[49m\u001b[43mdata_transformers\u001b[49m\u001b[38;5;241;43m.\u001b[39;49m\u001b[43mget\u001b[49m\u001b[43m(\u001b[49m\u001b[43m)\u001b[49m\u001b[43m)\u001b[49m\n\u001b[1;32m    102\u001b[0m \u001b[38;5;66;03m# convert string input to a URLData\u001b[39;00m\n\u001b[1;32m    103\u001b[0m \u001b[38;5;28;01melif\u001b[39;00m \u001b[38;5;28misinstance\u001b[39m(data, \u001b[38;5;28mstr\u001b[39m):\n",
      "File \u001b[0;32m~/anaconda3/lib/python3.9/site-packages/toolz/functoolz.py:630\u001b[0m, in \u001b[0;36mpipe\u001b[0;34m(data, *funcs)\u001b[0m\n\u001b[1;32m    610\u001b[0m \u001b[38;5;124;03m\"\"\" Pipe a value through a sequence of functions\u001b[39;00m\n\u001b[1;32m    611\u001b[0m \n\u001b[1;32m    612\u001b[0m \u001b[38;5;124;03mI.e. ``pipe(data, f, g, h)`` is equivalent to ``h(g(f(data)))``\u001b[39;00m\n\u001b[0;32m   (...)\u001b[0m\n\u001b[1;32m    627\u001b[0m \u001b[38;5;124;03m    thread_last\u001b[39;00m\n\u001b[1;32m    628\u001b[0m \u001b[38;5;124;03m\"\"\"\u001b[39;00m\n\u001b[1;32m    629\u001b[0m \u001b[38;5;28;01mfor\u001b[39;00m func \u001b[38;5;129;01min\u001b[39;00m funcs:\n\u001b[0;32m--> 630\u001b[0m     data \u001b[38;5;241m=\u001b[39m \u001b[43mfunc\u001b[49m\u001b[43m(\u001b[49m\u001b[43mdata\u001b[49m\u001b[43m)\u001b[49m\n\u001b[1;32m    631\u001b[0m \u001b[38;5;28;01mreturn\u001b[39;00m data\n",
      "File \u001b[0;32m~/anaconda3/lib/python3.9/site-packages/toolz/functoolz.py:306\u001b[0m, in \u001b[0;36mcurry.__call__\u001b[0;34m(self, *args, **kwargs)\u001b[0m\n\u001b[1;32m    304\u001b[0m \u001b[38;5;28;01mdef\u001b[39;00m \u001b[38;5;21m__call__\u001b[39m(\u001b[38;5;28mself\u001b[39m, \u001b[38;5;241m*\u001b[39margs, \u001b[38;5;241m*\u001b[39m\u001b[38;5;241m*\u001b[39mkwargs):\n\u001b[1;32m    305\u001b[0m     \u001b[38;5;28;01mtry\u001b[39;00m:\n\u001b[0;32m--> 306\u001b[0m         \u001b[38;5;28;01mreturn\u001b[39;00m \u001b[38;5;28;43mself\u001b[39;49m\u001b[38;5;241;43m.\u001b[39;49m\u001b[43m_partial\u001b[49m\u001b[43m(\u001b[49m\u001b[38;5;241;43m*\u001b[39;49m\u001b[43margs\u001b[49m\u001b[43m,\u001b[49m\u001b[43m \u001b[49m\u001b[38;5;241;43m*\u001b[39;49m\u001b[38;5;241;43m*\u001b[39;49m\u001b[43mkwargs\u001b[49m\u001b[43m)\u001b[49m\n\u001b[1;32m    307\u001b[0m     \u001b[38;5;28;01mexcept\u001b[39;00m \u001b[38;5;167;01mTypeError\u001b[39;00m \u001b[38;5;28;01mas\u001b[39;00m exc:\n\u001b[1;32m    308\u001b[0m         \u001b[38;5;28;01mif\u001b[39;00m \u001b[38;5;28mself\u001b[39m\u001b[38;5;241m.\u001b[39m_should_curry(args, kwargs, exc):\n",
      "File \u001b[0;32m~/anaconda3/lib/python3.9/site-packages/altair/vegalite/data.py:19\u001b[0m, in \u001b[0;36mdefault_data_transformer\u001b[0;34m(data, max_rows)\u001b[0m\n\u001b[1;32m     17\u001b[0m \u001b[38;5;129m@curried\u001b[39m\u001b[38;5;241m.\u001b[39mcurry\n\u001b[1;32m     18\u001b[0m \u001b[38;5;28;01mdef\u001b[39;00m \u001b[38;5;21mdefault_data_transformer\u001b[39m(data, max_rows\u001b[38;5;241m=\u001b[39m\u001b[38;5;241m5000\u001b[39m):\n\u001b[0;32m---> 19\u001b[0m     \u001b[38;5;28;01mreturn\u001b[39;00m \u001b[43mcurried\u001b[49m\u001b[38;5;241;43m.\u001b[39;49m\u001b[43mpipe\u001b[49m\u001b[43m(\u001b[49m\u001b[43mdata\u001b[49m\u001b[43m,\u001b[49m\u001b[43m \u001b[49m\u001b[43mlimit_rows\u001b[49m\u001b[43m(\u001b[49m\u001b[43mmax_rows\u001b[49m\u001b[38;5;241;43m=\u001b[39;49m\u001b[43mmax_rows\u001b[49m\u001b[43m)\u001b[49m\u001b[43m,\u001b[49m\u001b[43m \u001b[49m\u001b[43mto_values\u001b[49m\u001b[43m)\u001b[49m\n",
      "File \u001b[0;32m~/anaconda3/lib/python3.9/site-packages/toolz/functoolz.py:630\u001b[0m, in \u001b[0;36mpipe\u001b[0;34m(data, *funcs)\u001b[0m\n\u001b[1;32m    610\u001b[0m \u001b[38;5;124;03m\"\"\" Pipe a value through a sequence of functions\u001b[39;00m\n\u001b[1;32m    611\u001b[0m \n\u001b[1;32m    612\u001b[0m \u001b[38;5;124;03mI.e. ``pipe(data, f, g, h)`` is equivalent to ``h(g(f(data)))``\u001b[39;00m\n\u001b[0;32m   (...)\u001b[0m\n\u001b[1;32m    627\u001b[0m \u001b[38;5;124;03m    thread_last\u001b[39;00m\n\u001b[1;32m    628\u001b[0m \u001b[38;5;124;03m\"\"\"\u001b[39;00m\n\u001b[1;32m    629\u001b[0m \u001b[38;5;28;01mfor\u001b[39;00m func \u001b[38;5;129;01min\u001b[39;00m funcs:\n\u001b[0;32m--> 630\u001b[0m     data \u001b[38;5;241m=\u001b[39m \u001b[43mfunc\u001b[49m\u001b[43m(\u001b[49m\u001b[43mdata\u001b[49m\u001b[43m)\u001b[49m\n\u001b[1;32m    631\u001b[0m \u001b[38;5;28;01mreturn\u001b[39;00m data\n",
      "File \u001b[0;32m~/anaconda3/lib/python3.9/site-packages/toolz/functoolz.py:306\u001b[0m, in \u001b[0;36mcurry.__call__\u001b[0;34m(self, *args, **kwargs)\u001b[0m\n\u001b[1;32m    304\u001b[0m \u001b[38;5;28;01mdef\u001b[39;00m \u001b[38;5;21m__call__\u001b[39m(\u001b[38;5;28mself\u001b[39m, \u001b[38;5;241m*\u001b[39margs, \u001b[38;5;241m*\u001b[39m\u001b[38;5;241m*\u001b[39mkwargs):\n\u001b[1;32m    305\u001b[0m     \u001b[38;5;28;01mtry\u001b[39;00m:\n\u001b[0;32m--> 306\u001b[0m         \u001b[38;5;28;01mreturn\u001b[39;00m \u001b[38;5;28;43mself\u001b[39;49m\u001b[38;5;241;43m.\u001b[39;49m\u001b[43m_partial\u001b[49m\u001b[43m(\u001b[49m\u001b[38;5;241;43m*\u001b[39;49m\u001b[43margs\u001b[49m\u001b[43m,\u001b[49m\u001b[43m \u001b[49m\u001b[38;5;241;43m*\u001b[39;49m\u001b[38;5;241;43m*\u001b[39;49m\u001b[43mkwargs\u001b[49m\u001b[43m)\u001b[49m\n\u001b[1;32m    307\u001b[0m     \u001b[38;5;28;01mexcept\u001b[39;00m \u001b[38;5;167;01mTypeError\u001b[39;00m \u001b[38;5;28;01mas\u001b[39;00m exc:\n\u001b[1;32m    308\u001b[0m         \u001b[38;5;28;01mif\u001b[39;00m \u001b[38;5;28mself\u001b[39m\u001b[38;5;241m.\u001b[39m_should_curry(args, kwargs, exc):\n",
      "File \u001b[0;32m~/anaconda3/lib/python3.9/site-packages/altair/utils/data.py:82\u001b[0m, in \u001b[0;36mlimit_rows\u001b[0;34m(data, max_rows)\u001b[0m\n\u001b[1;32m     80\u001b[0m     values \u001b[38;5;241m=\u001b[39m data\n\u001b[1;32m     81\u001b[0m \u001b[38;5;28;01mif\u001b[39;00m max_rows \u001b[38;5;129;01mis\u001b[39;00m \u001b[38;5;129;01mnot\u001b[39;00m \u001b[38;5;28;01mNone\u001b[39;00m \u001b[38;5;129;01mand\u001b[39;00m \u001b[38;5;28mlen\u001b[39m(values) \u001b[38;5;241m>\u001b[39m max_rows:\n\u001b[0;32m---> 82\u001b[0m     \u001b[38;5;28;01mraise\u001b[39;00m MaxRowsError(\n\u001b[1;32m     83\u001b[0m         \u001b[38;5;124m\"\u001b[39m\u001b[38;5;124mThe number of rows in your dataset is greater \u001b[39m\u001b[38;5;124m\"\u001b[39m\n\u001b[1;32m     84\u001b[0m         \u001b[38;5;124mf\u001b[39m\u001b[38;5;124m\"\u001b[39m\u001b[38;5;124mthan the maximum allowed (\u001b[39m\u001b[38;5;132;01m{\u001b[39;00mmax_rows\u001b[38;5;132;01m}\u001b[39;00m\u001b[38;5;124m).\u001b[39m\u001b[38;5;130;01m\\n\u001b[39;00m\u001b[38;5;130;01m\\n\u001b[39;00m\u001b[38;5;124m\"\u001b[39m\n\u001b[1;32m     85\u001b[0m         \u001b[38;5;124m\"\u001b[39m\u001b[38;5;124mSee https://altair-viz.github.io/user_guide/large_datasets.html \u001b[39m\u001b[38;5;124m\"\u001b[39m\n\u001b[1;32m     86\u001b[0m         \u001b[38;5;124m\"\u001b[39m\u001b[38;5;124mfor information on how to plot large datasets, \u001b[39m\u001b[38;5;124m\"\u001b[39m\n\u001b[1;32m     87\u001b[0m         \u001b[38;5;124m\"\u001b[39m\u001b[38;5;124mincluding how to install third-party data management tools and, \u001b[39m\u001b[38;5;124m\"\u001b[39m\n\u001b[1;32m     88\u001b[0m         \u001b[38;5;124m\"\u001b[39m\u001b[38;5;124min the right circumstance, disable the restriction\u001b[39m\u001b[38;5;124m\"\u001b[39m\n\u001b[1;32m     89\u001b[0m     )\n\u001b[1;32m     90\u001b[0m \u001b[38;5;28;01mreturn\u001b[39;00m data\n",
      "\u001b[0;31mMaxRowsError\u001b[0m: The number of rows in your dataset is greater than the maximum allowed (5000).\n\nSee https://altair-viz.github.io/user_guide/large_datasets.html for information on how to plot large datasets, including how to install third-party data management tools and, in the right circumstance, disable the restriction"
     ]
    },
    {
     "data": {
      "text/plain": [
       "alt.Chart(...)"
      ]
     },
     "execution_count": 7,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "alt.Chart(pageviews).mark_bar().encode(\n",
    "    y = 'country'\n",
    ")"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {
    "tags": []
   },
   "source": [
    "## MaxRowsError options\n",
    "\n",
    "We often hit a `MaxRowsError` when we use too much data to create a visualization. From the docs, \"This is not because Altair cannot handle larger datasets, but it is because it is important for the user to think carefully about how large datasets are handled.\" We can take off limit for number of rows, but that's not always a great idea because the notebook will have a Vega-Lite JSON specification (text) embedded for every output pane, which also includes the data, so you end up with huge notebooks or HTML pages!\n",
    "\n",
    "***There are a few different options:***\n",
    "\n",
    "Documentation: [Large datasets options with Altair](https://altair-viz.github.io/user_guide/large_datasets.html)\n",
    "\n",
    "### 1. Use a smaller data set\n",
    "\n",
    "Use Pandas to aggregate first so you have less data that you're feeding to Altair. This makes it less handy to do exploration, but Pandas is much faster than Altair, so your visualizations will render much more quickly. See my \n",
    "[Pandas 103 workshop video](https://warpwire.duke.edu/w/cd4EAA/) \n",
    "and the \n",
    "[accompanying repository](https://github.com/emonson/pandas-jupyterlab) \n",
    "for lessons on how to do grouping and aggregation with Pandas. Specifically, those lessons in the video use the\n",
    "[Groupby_basics](https://github.com/emonson/pandas-jupyterlab/blob/master/Groupby_Basics.ipynb)\n",
    "and\n",
    "[Groupby_NCexploration](https://github.com/emonson/pandas-jupyterlab/blob/master/Groupby_NCexploration.ipynb) notebooks. \n",
    "In that repository are also a couple notebooks on [using Altair to explore an NC NO<sub>2</sub> emissions dataset](https://github.com/emonson/pandas-jupyterlab/blob/master/Altair_NCexplore.ipynb) \n",
    "and a\n",
    "[timing comparison for Altair vs Pandas](https://github.com/emonson/pandas-jupyterlab/blob/master/Altair_UStimings.ipynb) \n",
    "on a large dataset with aggregation (50 seconds when using Altair for aggregating vs almost immediate when using Pandas).\n",
    "\n",
    "### 2. Refer to your data at a URL (remote or local)\n",
    "\n",
    "If your JSON or CSV data is **on a server** with a URL, you can just put that URL in place of the dataframe:\n",
    "\n",
    "```\n",
    "temps = 'https://cdn.jsdelivr.net/npm/vega-datasets@v1.29.0/data/seattle-temps.csv'\n",
    "alt.Chart(temps).mark_bar().encode(\n",
    "    x='month(date):O',\n",
    "    y='mean(temp):Q'\n",
    ")\n",
    "```\n",
    "\n",
    "You can also refer to **a local file**. If you save your data as JSON, then the \"URL\" of that file will be the file name. *NOTE:* The URL needs `/tree/` or `/files/` added to the beginning before the file name/path so Jupyter knows how to navigate to that local file. This isn't Altair's fault – it's a strangeness of how Jupyter refers to local files.\n",
    "\n",
    "```\n",
    "URL = 'libsmalldata.json'\n",
    "pageviews.to_json(URL, orient='records')\n",
    "\n",
    "alt.Chart('/files/'+URL).mark_...\n",
    "```\n",
    "\n",
    "### 3. VegaFusion\n",
    "\n",
    "From the docs: \"[VegaFusion](https://vegafusion.io/) is a third-party package that re-implements most Vega-Lite transforms for evaluation in the Python kernel, which makes it possible to scale Altair charts to millions of rows of data. VegaFusion provides two rendering modes that are useful in different situations.\"\n",
    "\n",
    "I think this is a great solution, and may be the most reasonable one for right now with Altair 5. Note that there are two different options that you can enable: \n",
    "- [VegaFusion mime renderer](https://vegafusion.io/mime_renderer.html) is for static visualizations, because it just cuts down the data by filtering to the rows and columns needed for the visualization\n",
    "- [VegaFusion widget renderer](https://vegafusion.io/widget_renderer.html) is for interactive visualizations and it uses the Python kernel to do the filtering, etc.\n",
    "\n",
    "*Unfortunately, the widget renderer solution will not preserve the charts visible when saving your notebook – you have to run the cells again to see them (the mime renderer does).*\n",
    "\n",
    "### 4. Turn off or raise the max rows limit\n",
    "\n",
    "As stated before, this can lead to huge HTML files and notebooks, but it'll work.\n",
    "\n",
    "```\n",
    "alt.data_transformers.enable('default', max_rows=None)\n",
    "```\n",
    "\n",
    "#### More resources\n",
    "\n",
    "- Again, see the \n",
    "[Altair documentation on how to plot large datasets](https://altair-viz.github.io/user_guide/large_datasets.html)\n",
    "- The [Altair tutorial](https://altair-viz.github.io/altair-tutorial/README.html) \n",
    "notebook `03-Binning-and-aggregation` section on [how Altair encodes data](https://altair-viz.github.io/altair-tutorial/notebooks/03-Binning-and-aggregation.html#aside-how-altair-encodes-data) has more details.\n",
    "- You can also read more generally about the [Altair data transformers](https://altair-viz.github.io/user_guide/data_transformers.html), but that gets kind of in the weeds...\n",
    "\n",
    "*If you want to see a list of the available data transformers, execute (yours may be different):*\n",
    "\n",
    "```\n",
    "[55]: alt.data_transformers.names()\n",
    "\n",
    "[55]: ['csv', 'default', 'json']\n",
    "```\n",
    "\n"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "---\n",
    "\n",
    "## Saving to HTML files\n",
    "\n",
    "As we saw in a previous lesson, saving an Altair visualization to an HTML file is very easy – you just have to chain a `.save('filename.html')` command on to the end of the specification.\n",
    "\n",
    "**Unfortunately, there is one complication – if you've using a non-default data_server or are referring to a local file by URL to avoid the MaxRowsError, you might want to turn that off before you save, so you can easily double-click to view your HTML file.** Or, you must at least understand that you'll need to run/have a web server to view your HTML visualizations."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### HTML files referring to local JSON files need a server\n",
    "\n",
    "When you save to HTML, you need to understand the issues with how the page will access the data:\n",
    "\n",
    "- If the data is embedded, there is no problem – you will be able to see your static *or interactive* Vega-Lite chart that Altair has generated.\n",
    "- **If the Vega-Lite chart refers to the data through a local JSON file (URL), the page won't display properly when you just double-click on it! Grabbing a local file is considered a [CORS request](https://en.wikipedia.org/wiki/Cross-origin_resource_sharing) in this scenario, and so *for security reasons* it isn't executed.**\n",
    "\n",
    "You have a couple options when you want to view any HTML-embedded Vega-Lite visualization that refers to a local JSON file:\n",
    "- Put it (and the JSON data file) on a web server (like your \n",
    "[Duke CIFS space](https://oit.duke.edu/what-we-do/applications/cifs) \n",
    "and view it through your browser\n",
    "- If you don't have easy access to a web server, you can run a temporary one locally by going into the directory with the files in a terminal on the Mac, or in the Anaconda prompt on Windows, and type:\n",
    "\n",
    "`python -m http.server`\n",
    "\n",
    "That should print out a message saying:\n",
    "\n",
    "`Serving HTTP on 0.0.0.0 port 8000 (http://0.0.0.0:8000/) …`\n",
    "\n",
    "which means you can go to http://0.0.0.0:8000/ or http://127.0.0.1:8000/ or http://localhost:8000 in your browser and see the current directory. Click on the HTML file you want to view and the visualization should work fine.\n"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "---\n",
    "\n",
    "### We'll use the VegaFusion widget renderer to get around the MaxRowsError\n",
    "\n",
    "If you haven't installed VegaFusion, you need to run in the notebook:\n",
    "\n",
    "```\n",
    "!pip install \"vegafusion-jupyter[embed]\"\n",
    "```\n",
    "\n",
    "Or, in your terminal just run the same thing without the exclamation mark before it:\n",
    "\n",
    "```\n",
    "!pip install \"vegafusion-jupyter[embed]\"\n",
    "```\n",
    "\n",
    "**and then quit and restart JupyterLab.** Then run all cells up to here.\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "vegafusion.enable(mimetype='html', row_limit=10000, embed_options=None)"
      ]
     },
     "execution_count": 8,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "import vegafusion as vf\n",
    "vf.enable()"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "---\n",
    "\n",
    "*Now that you've gotten bogged down in all of those details, and forgotten all about how to compose an Altair visualization, let's try an exercise!*\n",
    "\n",
    "## EXERCISE 1: Horizontal bars of visitors per country\n",
    "\n",
    "Make a bar chart of \n",
    "- *sum of the number of visitors over all the data* – horizontal (bottom) axis\n",
    "- *per country* – vertical axis\n",
    "\n",
    "![goal bar chart](images/libvisitscountrybars.png)\n",
    "\n",
    "```\n",
    "alt.Chart(----).mark_----().encode(\n",
    "    x = ----,\n",
    "    y = ----\n",
    ")\n",
    "```\n",
    "\n",
    "- **Use the code chunk above as a guide, but try to type rather than copy/paste** \n",
    "- **Replace the dashes with correct code.**"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "---\n",
    "\n",
    "## Sum of visitors within Library of Congress Categories by country\n",
    "\n",
    "If we want to see how may items were viewed per LCC category, a bar chart is a good starting place. \n",
    "\n",
    "Since the label lines are long, it's easier to read them if they're horizontal.\n",
    "\n",
    "We can also split these bars by country using color to give us a general sense of the split, *as long as we remember that it's not easy for people to compare bars that don't have the same baseline*."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/html": [
       "\n",
       "<style>\n",
       "  #altair-viz-297422d60e0240a48140b67f69b2514d.vega-embed {\n",
       "    width: 100%;\n",
       "    display: flex;\n",
       "  }\n",
       "\n",
       "  #altair-viz-297422d60e0240a48140b67f69b2514d.vega-embed details,\n",
       "  #altair-viz-297422d60e0240a48140b67f69b2514d.vega-embed details summary {\n",
       "    position: relative;\n",
       "  }\n",
       "</style>\n",
       "<div id=\"altair-viz-297422d60e0240a48140b67f69b2514d\"></div>\n",
       "<script type=\"text/javascript\">\n",
       "  var VEGA_DEBUG = (typeof VEGA_DEBUG == \"undefined\") ? {} : VEGA_DEBUG;\n",
       "  (function(spec, embedOpt){\n",
       "    let outputDiv = document.currentScript.previousElementSibling;\n",
       "    if (outputDiv.id !== \"altair-viz-297422d60e0240a48140b67f69b2514d\") {\n",
       "      outputDiv = document.getElementById(\"altair-viz-297422d60e0240a48140b67f69b2514d\");\n",
       "    }\n",
       "    const paths = {\n",
       "      \"vega\": \"https://cdn.jsdelivr.net/npm/vega@5?noext\",\n",
       "      \"vega-lib\": \"https://cdn.jsdelivr.net/npm/vega-lib?noext\",\n",
       "      \"vega-lite\": \"https://cdn.jsdelivr.net/npm/vega-lite@5.8.0?noext\",\n",
       "      \"vega-embed\": \"https://cdn.jsdelivr.net/npm/vega-embed@6?noext\",\n",
       "    };\n",
       "\n",
       "    function maybeLoadScript(lib, version) {\n",
       "      var key = `${lib.replace(\"-\", \"\")}_version`;\n",
       "      return (VEGA_DEBUG[key] == version) ?\n",
       "        Promise.resolve(paths[lib]) :\n",
       "        new Promise(function(resolve, reject) {\n",
       "          var s = document.createElement('script');\n",
       "          document.getElementsByTagName(\"head\")[0].appendChild(s);\n",
       "          s.async = true;\n",
       "          s.onload = () => {\n",
       "            VEGA_DEBUG[key] = version;\n",
       "            return resolve(paths[lib]);\n",
       "          };\n",
       "          s.onerror = () => reject(`Error loading script: ${paths[lib]}`);\n",
       "          s.src = paths[lib];\n",
       "        });\n",
       "    }\n",
       "\n",
       "    function showError(err) {\n",
       "      outputDiv.innerHTML = `<div class=\"error\" style=\"color:red;\">${err}</div>`;\n",
       "      throw err;\n",
       "    }\n",
       "\n",
       "    function displayChart(vegaEmbed) {\n",
       "      vegaEmbed(outputDiv, spec, embedOpt)\n",
       "        .catch(err => showError(`Javascript Error: ${err.message}<br>This usually means there's a typo in your chart specification. See the javascript console for the full traceback.`));\n",
       "    }\n",
       "\n",
       "    if(typeof define === \"function\" && define.amd) {\n",
       "      requirejs.config({paths});\n",
       "      require([\"vega-embed\"], displayChart, err => showError(`Error loading script: ${err.message}`));\n",
       "    } else {\n",
       "      maybeLoadScript(\"vega\", \"5\")\n",
       "        .then(() => maybeLoadScript(\"vega-lite\", \"5.8.0\"))\n",
       "        .then(() => maybeLoadScript(\"vega-embed\", \"6\"))\n",
       "        .catch(showError)\n",
       "        .then(() => displayChart(vegaEmbed));\n",
       "    }\n",
       "  })({\"$schema\": \"https://vega.github.io/schema/vega/v5.json\", \"data\": [{\"name\": \"source_0\", \"values\": [{\"country\": \"Canada\", \"lcc_description\": \"Military Science\", \"sum_visitors\": 10, \"sum_visitors_end\": 10.0, \"sum_visitors_start\": 0.0}, {\"country\": \"United States\", \"lcc_description\": \"History Of The Americas\", \"sum_visitors\": 253, \"sum_visitors_end\": 445.0, \"sum_visitors_start\": 192.0}, {\"country\": \"United Kingdom\", \"lcc_description\": \"Social Sciences\", \"sum_visitors\": 238, \"sum_visitors_end\": 435.0, \"sum_visitors_start\": 197.0}, {\"country\": \"United Kingdom\", \"lcc_description\": null, \"sum_visitors\": 653, \"sum_visitors_end\": 1215.0, \"sum_visitors_start\": 562.0}, {\"country\": \"United Kingdom\", \"lcc_description\": \"Science\", \"sum_visitors\": 103, \"sum_visitors_end\": 231.0, \"sum_visitors_start\": 128.0}, {\"country\": \"Canada\", \"lcc_description\": \"Medicine\", \"sum_visitors\": 54, \"sum_visitors_end\": 54.0, \"sum_visitors_start\": 0.0}, {\"country\": \"Canada\", \"lcc_description\": \"Language And Literature\", \"sum_visitors\": 401, \"sum_visitors_end\": 401.0, \"sum_visitors_start\": 0.0}, {\"country\": \"United Kingdom\", \"lcc_description\": \"Philosophy. Psychology. Religion\", \"sum_visitors\": 148, \"sum_visitors_end\": 402.0, \"sum_visitors_start\": 254.0}, {\"country\": \"United Kingdom\", \"lcc_description\": \"World History And History Of Europe, Asia, Africa, Australia, New Zealand, Etc.\", \"sum_visitors\": 126, \"sum_visitors_end\": 257.0, \"sum_visitors_start\": 131.0}, {\"country\": \"United Kingdom\", \"lcc_description\": \"Language And Literature\", \"sum_visitors\": 316, \"sum_visitors_end\": 717.0, \"sum_visitors_start\": 401.0}, {\"country\": \"United States\", \"lcc_description\": \"Science\", \"sum_visitors\": 371, \"sum_visitors_end\": 602.0, \"sum_visitors_start\": 231.0}, {\"country\": \"Canada\", \"lcc_description\": null, \"sum_visitors\": 562, \"sum_visitors_end\": 562.0, \"sum_visitors_start\": 0.0}, {\"country\": \"United States\", \"lcc_description\": \"Fine Arts\", \"sum_visitors\": 164, \"sum_visitors_end\": 333.0, \"sum_visitors_start\": 169.0}, {\"country\": \"United States\", \"lcc_description\": \"Philosophy. Psychology. Religion\", \"sum_visitors\": 524, \"sum_visitors_end\": 926.0, \"sum_visitors_start\": 402.0}, {\"country\": \"United States\", \"lcc_description\": \"Social Sciences\", \"sum_visitors\": 608, \"sum_visitors_end\": 1043.0, \"sum_visitors_start\": 435.0}, {\"country\": \"United Kingdom\", \"lcc_description\": \"Education\", \"sum_visitors\": 44, \"sum_visitors_end\": 181.0, \"sum_visitors_start\": 137.0}, {\"country\": \"Canada\", \"lcc_description\": \"Social Sciences\", \"sum_visitors\": 197, \"sum_visitors_end\": 197.0, \"sum_visitors_start\": 0.0}, {\"country\": \"Canada\", \"lcc_description\": \"Bibliography. Library Science. Information Resources (General)\", \"sum_visitors\": 53, \"sum_visitors_end\": 53.0, \"sum_visitors_start\": 0.0}, {\"country\": \"United States\", \"lcc_description\": null, \"sum_visitors\": 792, \"sum_visitors_end\": 2007.0, \"sum_visitors_start\": 1215.0}, {\"country\": \"United Kingdom\", \"lcc_description\": \"Law\", \"sum_visitors\": 118, \"sum_visitors_end\": 250.0, \"sum_visitors_start\": 132.0}, {\"country\": \"Canada\", \"lcc_description\": \"Education\", \"sum_visitors\": 137, \"sum_visitors_end\": 137.0, \"sum_visitors_start\": 0.0}, {\"country\": \"Canada\", \"lcc_description\": \"Music And Books On Music\", \"sum_visitors\": 75, \"sum_visitors_end\": 75.0, \"sum_visitors_start\": 0.0}, {\"country\": \"United Kingdom\", \"lcc_description\": \"Fine Arts\", \"sum_visitors\": 88, \"sum_visitors_end\": 169.0, \"sum_visitors_start\": 81.0}, {\"country\": \"Canada\", \"lcc_description\": \"World History And History Of Europe, Asia, Africa, Australia, New Zealand, Etc.\", \"sum_visitors\": 131, \"sum_visitors_end\": 131.0, \"sum_visitors_start\": 0.0}, {\"country\": \"United States\", \"lcc_description\": \"Language And Literature\", \"sum_visitors\": 1023, \"sum_visitors_end\": 1740.0, \"sum_visitors_start\": 717.0}, {\"country\": \"Canada\", \"lcc_description\": \"Law\", \"sum_visitors\": 132, \"sum_visitors_end\": 132.0, \"sum_visitors_start\": 0.0}, {\"country\": \"United States\", \"lcc_description\": \"Geography. Anthropology. Recreation\", \"sum_visitors\": 147, \"sum_visitors_end\": 286.0, \"sum_visitors_start\": 139.0}, {\"country\": \"United States\", \"lcc_description\": \"Law\", \"sum_visitors\": 188, \"sum_visitors_end\": 438.0, \"sum_visitors_start\": 250.0}, {\"country\": \"United Kingdom\", \"lcc_description\": \"Bibliography. Library Science. Information Resources (General)\", \"sum_visitors\": 43, \"sum_visitors_end\": 96.0, \"sum_visitors_start\": 53.0}, {\"country\": \"United Kingdom\", \"lcc_description\": \"General Works\", \"sum_visitors\": 50, \"sum_visitors_end\": 91.0, \"sum_visitors_start\": 41.0}, {\"country\": \"United States\", \"lcc_description\": \"Agriculture\", \"sum_visitors\": 28, \"sum_visitors_end\": 80.0, \"sum_visitors_start\": 52.0}, {\"country\": \"United Kingdom\", \"lcc_description\": \"Political Science\", \"sum_visitors\": 152, \"sum_visitors_end\": 221.0, \"sum_visitors_start\": 69.0}, {\"country\": \"United Kingdom\", \"lcc_description\": \"Geography. Anthropology. Recreation\", \"sum_visitors\": 59, \"sum_visitors_end\": 139.0, \"sum_visitors_start\": 80.0}, {\"country\": \"Canada\", \"lcc_description\": \"Geography. Anthropology. Recreation\", \"sum_visitors\": 80, \"sum_visitors_end\": 80.0, \"sum_visitors_start\": 0.0}, {\"country\": \"Canada\", \"lcc_description\": \"Philosophy. Psychology. Religion\", \"sum_visitors\": 254, \"sum_visitors_end\": 254.0, \"sum_visitors_start\": 0.0}, {\"country\": \"Canada\", \"lcc_description\": \"General Works\", \"sum_visitors\": 41, \"sum_visitors_end\": 41.0, \"sum_visitors_start\": 0.0}, {\"country\": \"Canada\", \"lcc_description\": \"Science\", \"sum_visitors\": 128, \"sum_visitors_end\": 128.0, \"sum_visitors_start\": 0.0}, {\"country\": \"United States\", \"lcc_description\": \"Technology\", \"sum_visitors\": 114, \"sum_visitors_end\": 332.0, \"sum_visitors_start\": 218.0}, {\"country\": \"United States\", \"lcc_description\": \"World History And History Of Europe, Asia, Africa, Australia, New Zealand, Etc.\", \"sum_visitors\": 357, \"sum_visitors_end\": 614.0, \"sum_visitors_start\": 257.0}, {\"country\": \"United Kingdom\", \"lcc_description\": \"Agriculture\", \"sum_visitors\": 21, \"sum_visitors_end\": 52.0, \"sum_visitors_start\": 31.0}, {\"country\": \"Canada\", \"lcc_description\": \"History Of The Americas\", \"sum_visitors\": 88, \"sum_visitors_end\": 88.0, \"sum_visitors_start\": 0.0}, {\"country\": \"United States\", \"lcc_description\": \"General Works\", \"sum_visitors\": 32, \"sum_visitors_end\": 123.0, \"sum_visitors_start\": 91.0}, {\"country\": \"United Kingdom\", \"lcc_description\": \"Music And Books On Music\", \"sum_visitors\": 51, \"sum_visitors_end\": 126.0, \"sum_visitors_start\": 75.0}, {\"country\": \"Canada\", \"lcc_description\": \"Technology\", \"sum_visitors\": 173, \"sum_visitors_end\": 173.0, \"sum_visitors_start\": 0.0}, {\"country\": \"United States\", \"lcc_description\": \"Music And Books On Music\", \"sum_visitors\": 220, \"sum_visitors_end\": 346.0, \"sum_visitors_start\": 126.0}, {\"country\": \"Canada\", \"lcc_description\": \"Political Science\", \"sum_visitors\": 69, \"sum_visitors_end\": 69.0, \"sum_visitors_start\": 0.0}, {\"country\": \"United States\", \"lcc_description\": \"Education\", \"sum_visitors\": 66, \"sum_visitors_end\": 247.0, \"sum_visitors_start\": 181.0}, {\"country\": \"United States\", \"lcc_description\": \"Auxiliary Sciences Of History\", \"sum_visitors\": 35, \"sum_visitors_end\": 78.0, \"sum_visitors_start\": 43.0}, {\"country\": \"Canada\", \"lcc_description\": \"Auxiliary Sciences Of History\", \"sum_visitors\": 20, \"sum_visitors_end\": 20.0, \"sum_visitors_start\": 0.0}, {\"country\": \"United Kingdom\", \"lcc_description\": \"History Of The Americas\", \"sum_visitors\": 104, \"sum_visitors_end\": 192.0, \"sum_visitors_start\": 88.0}, {\"country\": \"United States\", \"lcc_description\": \"Medicine\", \"sum_visitors\": 131, \"sum_visitors_end\": 222.0, \"sum_visitors_start\": 91.0}, {\"country\": \"United States\", \"lcc_description\": \"Military Science\", \"sum_visitors\": 13, \"sum_visitors_end\": 32.0, \"sum_visitors_start\": 19.0}, {\"country\": \"Canada\", \"lcc_description\": \"Fine Arts\", \"sum_visitors\": 81, \"sum_visitors_end\": 81.0, \"sum_visitors_start\": 0.0}, {\"country\": \"United States\", \"lcc_description\": \"Political Science\", \"sum_visitors\": 135, \"sum_visitors_end\": 356.0, \"sum_visitors_start\": 221.0}, {\"country\": \"United Kingdom\", \"lcc_description\": \"Auxiliary Sciences Of History\", \"sum_visitors\": 23, \"sum_visitors_end\": 43.0, \"sum_visitors_start\": 20.0}, {\"country\": \"Canada\", \"lcc_description\": \"Agriculture\", \"sum_visitors\": 31, \"sum_visitors_end\": 31.0, \"sum_visitors_start\": 0.0}, {\"country\": \"United States\", \"lcc_description\": \"Bibliography. 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Psychology. Religion\"}, {\"lcc_description\": \"World History And History Of Europe, Asia, Africa, Australia, New Zealand, Etc.\"}, {\"lcc_description\": \"Fine Arts\"}, {\"lcc_description\": \"Education\"}, {\"lcc_description\": \"Bibliography. Library Science. Information Resources (General)\"}, {\"lcc_description\": \"Law\"}, {\"lcc_description\": \"Music And Books On Music\"}, {\"lcc_description\": \"Geography. Anthropology. Recreation\"}, {\"lcc_description\": \"General Works\"}, {\"lcc_description\": \"Agriculture\"}, {\"lcc_description\": \"Political Science\"}, {\"lcc_description\": \"Technology\"}, {\"lcc_description\": \"Auxiliary Sciences Of History\"}, {\"lcc_description\": \"Naval Science\"}]}, {\"name\": \"source_0_color_domain_country\", \"values\": [{\"country\": \"Canada\"}, {\"country\": \"United States\"}, {\"country\": \"United Kingdom\"}]}], \"signals\": [{\"name\": \"y_step\", \"value\": 20}, {\"name\": \"height\", \"update\": \"bandspace(domain('y').length, 0.1, 0.05) * y_step\"}], \"marks\": [{\"type\": \"rect\", \"name\": \"marks\", \"from\": {\"data\": \"source_0\"}, \"encode\": {\"update\": {\"y\": {\"field\": \"lcc_description\", \"scale\": \"y\"}, \"height\": {\"signal\": \"max(0.25, bandwidth('y'))\"}, \"fill\": {\"field\": \"country\", \"scale\": \"color\"}, \"ariaRoleDescription\": {\"value\": \"bar\"}, \"description\": {\"signal\": \"\\\"Sum of visitors: \\\" + (format(datum[\\\"sum_visitors\\\"], \\\"\\\")) + \\\"; lcc_description: \\\" + (isValid(datum[\\\"lcc_description\\\"]) ? datum[\\\"lcc_description\\\"] : \\\"\\\"+datum[\\\"lcc_description\\\"]) + \\\"; country: \\\" + (isValid(datum[\\\"country\\\"]) ? datum[\\\"country\\\"] : \\\"\\\"+datum[\\\"country\\\"])\"}, \"x\": {\"field\": \"sum_visitors_end\", \"scale\": \"x\"}, \"x2\": {\"field\": \"sum_visitors_start\", \"scale\": \"x\"}}}, \"style\": [\"bar\"]}], \"scales\": [{\"name\": \"x\", \"type\": \"linear\", \"domain\": {\"fields\": [\"sum_visitors_start\", \"sum_visitors_end\"], \"data\": \"source_0\"}, \"range\": [0, {\"signal\": \"width\"}], \"nice\": true, \"zero\": true}, {\"name\": \"y\", \"type\": \"band\", \"domain\": {\"data\": \"source_0_y_domain_lcc_description\", \"field\": \"lcc_description\", \"sort\": true}, \"range\": {\"step\": {\"signal\": \"y_step\"}}, \"paddingInner\": 0.1, \"paddingOuter\": 0.05}, {\"name\": \"color\", \"type\": \"ordinal\", \"domain\": {\"data\": \"source_0_color_domain_country\", \"field\": \"country\", \"sort\": true}, \"range\": \"category\"}], \"axes\": [{\"scale\": \"x\", \"tickCount\": {\"signal\": \"ceil(width/40)\"}, \"gridScale\": \"y\", \"domain\": false, \"minExtent\": 0, \"labels\": false, \"grid\": true, \"aria\": false, \"maxExtent\": 0, \"zindex\": 0, \"orient\": \"bottom\", \"ticks\": false}, {\"scale\": \"x\", \"orient\": \"bottom\", \"zindex\": 0, \"labelOverlap\": true, \"labelFlush\": true, \"tickCount\": {\"signal\": \"ceil(width/40)\"}, \"grid\": false, \"title\": \"Sum of visitors\"}, {\"scale\": \"y\", \"title\": \"lcc_description\", \"zindex\": 0, \"orient\": \"left\", \"grid\": false}], \"background\": \"white\", \"padding\": 5, \"style\": \"cell\", \"width\": 300, \"legends\": [{\"fill\": \"color\", \"symbolType\": \"square\", \"title\": \"country\"}]}, {\"mode\": \"vega\"});\n",
       "</script>"
      ],
      "text/plain": [
       "alt.Chart(...)"
      ]
     },
     "execution_count": 9,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "alt.Chart(pageviews).mark_bar().encode(\n",
    "    x = 'sum(visitors)',\n",
    "    y = 'lcc_description',\n",
    "    color = 'country'\n",
    ")"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Providing extra arguments for encoding channels\n",
    "\n",
    "Up until now we have used simple expressions for `x=` and `y=` because all we were feeding Altair was a column or a simple aggregation expression on a column.\n",
    "\n",
    "**Sometimes you need to give extra arguments to alter the way the axes are displayed. Altair has special objects for the encoding channels, to help you do that.**\n",
    "\n",
    "- They all start with capital letters, and \n",
    "- you have to reference them starting with the altair module.\n",
    "\n",
    "e.g. \n",
    "\n",
    "`alt.Y('lcc_description', sort='descending')`"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/html": [
       "\n",
       "<style>\n",
       "  #altair-viz-03f5f447412d4c599d24da4c9df0c342.vega-embed {\n",
       "    width: 100%;\n",
       "    display: flex;\n",
       "  }\n",
       "\n",
       "  #altair-viz-03f5f447412d4c599d24da4c9df0c342.vega-embed details,\n",
       "  #altair-viz-03f5f447412d4c599d24da4c9df0c342.vega-embed details summary {\n",
       "    position: relative;\n",
       "  }\n",
       "</style>\n",
       "<div id=\"altair-viz-03f5f447412d4c599d24da4c9df0c342\"></div>\n",
       "<script type=\"text/javascript\">\n",
       "  var VEGA_DEBUG = (typeof VEGA_DEBUG == \"undefined\") ? {} : VEGA_DEBUG;\n",
       "  (function(spec, embedOpt){\n",
       "    let outputDiv = document.currentScript.previousElementSibling;\n",
       "    if (outputDiv.id !== \"altair-viz-03f5f447412d4c599d24da4c9df0c342\") {\n",
       "      outputDiv = document.getElementById(\"altair-viz-03f5f447412d4c599d24da4c9df0c342\");\n",
       "    }\n",
       "    const paths = {\n",
       "      \"vega\": \"https://cdn.jsdelivr.net/npm/vega@5?noext\",\n",
       "      \"vega-lib\": \"https://cdn.jsdelivr.net/npm/vega-lib?noext\",\n",
       "      \"vega-lite\": \"https://cdn.jsdelivr.net/npm/vega-lite@5.8.0?noext\",\n",
       "      \"vega-embed\": \"https://cdn.jsdelivr.net/npm/vega-embed@6?noext\",\n",
       "    };\n",
       "\n",
       "    function maybeLoadScript(lib, version) {\n",
       "      var key = `${lib.replace(\"-\", \"\")}_version`;\n",
       "      return (VEGA_DEBUG[key] == version) ?\n",
       "        Promise.resolve(paths[lib]) :\n",
       "        new Promise(function(resolve, reject) {\n",
       "          var s = document.createElement('script');\n",
       "          document.getElementsByTagName(\"head\")[0].appendChild(s);\n",
       "          s.async = true;\n",
       "          s.onload = () => {\n",
       "            VEGA_DEBUG[key] = version;\n",
       "            return resolve(paths[lib]);\n",
       "          };\n",
       "          s.onerror = () => reject(`Error loading script: ${paths[lib]}`);\n",
       "          s.src = paths[lib];\n",
       "        });\n",
       "    }\n",
       "\n",
       "    function showError(err) {\n",
       "      outputDiv.innerHTML = `<div class=\"error\" style=\"color:red;\">${err}</div>`;\n",
       "      throw err;\n",
       "    }\n",
       "\n",
       "    function displayChart(vegaEmbed) {\n",
       "      vegaEmbed(outputDiv, spec, embedOpt)\n",
       "        .catch(err => showError(`Javascript Error: ${err.message}<br>This usually means there's a typo in your chart specification. See the javascript console for the full traceback.`));\n",
       "    }\n",
       "\n",
       "    if(typeof define === \"function\" && define.amd) {\n",
       "      requirejs.config({paths});\n",
       "      require([\"vega-embed\"], displayChart, err => showError(`Error loading script: ${err.message}`));\n",
       "    } else {\n",
       "      maybeLoadScript(\"vega\", \"5\")\n",
       "        .then(() => maybeLoadScript(\"vega-lite\", \"5.8.0\"))\n",
       "        .then(() => maybeLoadScript(\"vega-embed\", \"6\"))\n",
       "        .catch(showError)\n",
       "        .then(() => displayChart(vegaEmbed));\n",
       "    }\n",
       "  })({\"$schema\": \"https://vega.github.io/schema/vega/v5.json\", \"data\": [{\"name\": \"source_0\"}, {\"name\": \"data_0\", \"values\": [{\"country\": \"Canada\", \"lcc_description\": \"Military Science\", \"sum_visitors\": 10, \"sum_visitors_end\": 10.0, \"sum_visitors_start\": 0.0}, {\"country\": \"United States\", \"lcc_description\": \"History Of The Americas\", \"sum_visitors\": 253, \"sum_visitors_end\": 445.0, \"sum_visitors_start\": 192.0}, {\"country\": \"United Kingdom\", \"lcc_description\": \"Social Sciences\", \"sum_visitors\": 238, \"sum_visitors_end\": 435.0, \"sum_visitors_start\": 197.0}, {\"country\": \"United Kingdom\", \"lcc_description\": null, \"sum_visitors\": 653, \"sum_visitors_end\": 1215.0, \"sum_visitors_start\": 562.0}, {\"country\": \"United Kingdom\", \"lcc_description\": \"Science\", \"sum_visitors\": 103, \"sum_visitors_end\": 231.0, \"sum_visitors_start\": 128.0}, {\"country\": \"Canada\", \"lcc_description\": \"Medicine\", \"sum_visitors\": 54, \"sum_visitors_end\": 54.0, \"sum_visitors_start\": 0.0}, {\"country\": \"Canada\", \"lcc_description\": \"Language And Literature\", \"sum_visitors\": 401, \"sum_visitors_end\": 401.0, \"sum_visitors_start\": 0.0}, {\"country\": \"United Kingdom\", \"lcc_description\": \"Philosophy. Psychology. Religion\", \"sum_visitors\": 148, \"sum_visitors_end\": 402.0, \"sum_visitors_start\": 254.0}, {\"country\": \"United Kingdom\", \"lcc_description\": \"World History And History Of Europe, Asia, Africa, Australia, New Zealand, Etc.\", \"sum_visitors\": 126, \"sum_visitors_end\": 257.0, \"sum_visitors_start\": 131.0}, {\"country\": \"United Kingdom\", \"lcc_description\": \"Language And Literature\", \"sum_visitors\": 316, \"sum_visitors_end\": 717.0, \"sum_visitors_start\": 401.0}, {\"country\": \"United States\", \"lcc_description\": \"Science\", \"sum_visitors\": 371, \"sum_visitors_end\": 602.0, \"sum_visitors_start\": 231.0}, {\"country\": \"Canada\", \"lcc_description\": null, \"sum_visitors\": 562, \"sum_visitors_end\": 562.0, \"sum_visitors_start\": 0.0}, {\"country\": \"United States\", \"lcc_description\": \"Fine Arts\", \"sum_visitors\": 164, \"sum_visitors_end\": 333.0, \"sum_visitors_start\": 169.0}, {\"country\": \"United States\", \"lcc_description\": \"Philosophy. Psychology. Religion\", \"sum_visitors\": 524, \"sum_visitors_end\": 926.0, \"sum_visitors_start\": 402.0}, {\"country\": \"United States\", \"lcc_description\": \"Social Sciences\", \"sum_visitors\": 608, \"sum_visitors_end\": 1043.0, \"sum_visitors_start\": 435.0}, {\"country\": \"United Kingdom\", \"lcc_description\": \"Education\", \"sum_visitors\": 44, \"sum_visitors_end\": 181.0, \"sum_visitors_start\": 137.0}, {\"country\": \"Canada\", \"lcc_description\": \"Social Sciences\", \"sum_visitors\": 197, \"sum_visitors_end\": 197.0, \"sum_visitors_start\": 0.0}, {\"country\": \"Canada\", \"lcc_description\": \"Bibliography. Library Science. Information Resources (General)\", \"sum_visitors\": 53, \"sum_visitors_end\": 53.0, \"sum_visitors_start\": 0.0}, {\"country\": \"United States\", \"lcc_description\": null, \"sum_visitors\": 792, \"sum_visitors_end\": 2007.0, \"sum_visitors_start\": 1215.0}, {\"country\": \"United Kingdom\", \"lcc_description\": \"Law\", \"sum_visitors\": 118, \"sum_visitors_end\": 250.0, \"sum_visitors_start\": 132.0}, {\"country\": \"Canada\", \"lcc_description\": \"Education\", \"sum_visitors\": 137, \"sum_visitors_end\": 137.0, \"sum_visitors_start\": 0.0}, {\"country\": \"Canada\", \"lcc_description\": \"Music And Books On Music\", \"sum_visitors\": 75, \"sum_visitors_end\": 75.0, \"sum_visitors_start\": 0.0}, {\"country\": \"United Kingdom\", \"lcc_description\": \"Fine Arts\", \"sum_visitors\": 88, \"sum_visitors_end\": 169.0, \"sum_visitors_start\": 81.0}, {\"country\": \"Canada\", \"lcc_description\": \"World History And History Of Europe, Asia, Africa, Australia, New Zealand, Etc.\", \"sum_visitors\": 131, \"sum_visitors_end\": 131.0, \"sum_visitors_start\": 0.0}, {\"country\": \"United States\", \"lcc_description\": \"Language And Literature\", \"sum_visitors\": 1023, \"sum_visitors_end\": 1740.0, \"sum_visitors_start\": 717.0}, {\"country\": \"Canada\", \"lcc_description\": \"Law\", \"sum_visitors\": 132, \"sum_visitors_end\": 132.0, \"sum_visitors_start\": 0.0}, {\"country\": \"United States\", \"lcc_description\": \"Geography. Anthropology. Recreation\", \"sum_visitors\": 147, \"sum_visitors_end\": 286.0, \"sum_visitors_start\": 139.0}, {\"country\": \"United States\", \"lcc_description\": \"Law\", \"sum_visitors\": 188, \"sum_visitors_end\": 438.0, \"sum_visitors_start\": 250.0}, {\"country\": \"United Kingdom\", \"lcc_description\": \"Bibliography. Library Science. Information Resources (General)\", \"sum_visitors\": 43, \"sum_visitors_end\": 96.0, \"sum_visitors_start\": 53.0}, {\"country\": \"United Kingdom\", \"lcc_description\": \"General Works\", \"sum_visitors\": 50, \"sum_visitors_end\": 91.0, \"sum_visitors_start\": 41.0}, {\"country\": \"United States\", \"lcc_description\": \"Agriculture\", \"sum_visitors\": 28, \"sum_visitors_end\": 80.0, \"sum_visitors_start\": 52.0}, {\"country\": \"United Kingdom\", \"lcc_description\": \"Political Science\", \"sum_visitors\": 152, \"sum_visitors_end\": 221.0, \"sum_visitors_start\": 69.0}, {\"country\": \"United Kingdom\", \"lcc_description\": \"Geography. Anthropology. Recreation\", \"sum_visitors\": 59, \"sum_visitors_end\": 139.0, \"sum_visitors_start\": 80.0}, {\"country\": \"Canada\", \"lcc_description\": \"Geography. Anthropology. Recreation\", \"sum_visitors\": 80, \"sum_visitors_end\": 80.0, \"sum_visitors_start\": 0.0}, {\"country\": \"Canada\", \"lcc_description\": \"Philosophy. Psychology. Religion\", \"sum_visitors\": 254, \"sum_visitors_end\": 254.0, \"sum_visitors_start\": 0.0}, {\"country\": \"Canada\", \"lcc_description\": \"General Works\", \"sum_visitors\": 41, \"sum_visitors_end\": 41.0, \"sum_visitors_start\": 0.0}, {\"country\": \"Canada\", \"lcc_description\": \"Science\", \"sum_visitors\": 128, \"sum_visitors_end\": 128.0, \"sum_visitors_start\": 0.0}, {\"country\": \"United States\", \"lcc_description\": \"Technology\", \"sum_visitors\": 114, \"sum_visitors_end\": 332.0, \"sum_visitors_start\": 218.0}, {\"country\": \"United States\", \"lcc_description\": \"World History And History Of Europe, Asia, Africa, Australia, New Zealand, Etc.\", \"sum_visitors\": 357, \"sum_visitors_end\": 614.0, \"sum_visitors_start\": 257.0}, {\"country\": \"United Kingdom\", \"lcc_description\": \"Agriculture\", \"sum_visitors\": 21, \"sum_visitors_end\": 52.0, \"sum_visitors_start\": 31.0}, {\"country\": \"Canada\", \"lcc_description\": \"History Of The Americas\", \"sum_visitors\": 88, \"sum_visitors_end\": 88.0, \"sum_visitors_start\": 0.0}, {\"country\": \"United States\", \"lcc_description\": \"General Works\", \"sum_visitors\": 32, \"sum_visitors_end\": 123.0, \"sum_visitors_start\": 91.0}, {\"country\": \"United Kingdom\", \"lcc_description\": \"Music And Books On Music\", \"sum_visitors\": 51, \"sum_visitors_end\": 126.0, \"sum_visitors_start\": 75.0}, {\"country\": \"Canada\", \"lcc_description\": \"Technology\", \"sum_visitors\": 173, \"sum_visitors_end\": 173.0, \"sum_visitors_start\": 0.0}, {\"country\": \"United States\", \"lcc_description\": \"Music And Books On Music\", \"sum_visitors\": 220, \"sum_visitors_end\": 346.0, \"sum_visitors_start\": 126.0}, {\"country\": \"Canada\", \"lcc_description\": \"Political Science\", \"sum_visitors\": 69, \"sum_visitors_end\": 69.0, \"sum_visitors_start\": 0.0}, {\"country\": \"United States\", \"lcc_description\": \"Education\", \"sum_visitors\": 66, \"sum_visitors_end\": 247.0, \"sum_visitors_start\": 181.0}, {\"country\": \"United States\", \"lcc_description\": \"Auxiliary Sciences Of History\", \"sum_visitors\": 35, \"sum_visitors_end\": 78.0, \"sum_visitors_start\": 43.0}, {\"country\": \"Canada\", \"lcc_description\": \"Auxiliary Sciences Of History\", \"sum_visitors\": 20, \"sum_visitors_end\": 20.0, \"sum_visitors_start\": 0.0}, {\"country\": \"United Kingdom\", \"lcc_description\": \"History Of The Americas\", \"sum_visitors\": 104, \"sum_visitors_end\": 192.0, \"sum_visitors_start\": 88.0}, {\"country\": \"United States\", \"lcc_description\": \"Medicine\", \"sum_visitors\": 131, \"sum_visitors_end\": 222.0, \"sum_visitors_start\": 91.0}, {\"country\": \"United States\", \"lcc_description\": \"Military Science\", \"sum_visitors\": 13, \"sum_visitors_end\": 32.0, \"sum_visitors_start\": 19.0}, {\"country\": \"Canada\", \"lcc_description\": \"Fine Arts\", \"sum_visitors\": 81, \"sum_visitors_end\": 81.0, \"sum_visitors_start\": 0.0}, {\"country\": \"United States\", \"lcc_description\": \"Political Science\", \"sum_visitors\": 135, \"sum_visitors_end\": 356.0, \"sum_visitors_start\": 221.0}, {\"country\": \"United Kingdom\", \"lcc_description\": \"Auxiliary Sciences Of History\", \"sum_visitors\": 23, \"sum_visitors_end\": 43.0, \"sum_visitors_start\": 20.0}, {\"country\": \"Canada\", \"lcc_description\": \"Agriculture\", \"sum_visitors\": 31, \"sum_visitors_end\": 31.0, \"sum_visitors_start\": 0.0}, {\"country\": \"United States\", \"lcc_description\": \"Bibliography. Library Science. Information Resources (General)\", \"sum_visitors\": 38, \"sum_visitors_end\": 134.0, \"sum_visitors_start\": 96.0}, {\"country\": \"United Kingdom\", \"lcc_description\": \"Technology\", \"sum_visitors\": 45, \"sum_visitors_end\": 218.0, \"sum_visitors_start\": 173.0}, {\"country\": \"United Kingdom\", \"lcc_description\": \"Medicine\", \"sum_visitors\": 37, \"sum_visitors_end\": 91.0, \"sum_visitors_start\": 54.0}, {\"country\": \"United Kingdom\", \"lcc_description\": \"Military Science\", \"sum_visitors\": 9, \"sum_visitors_end\": 19.0, \"sum_visitors_start\": 10.0}, {\"country\": \"United States\", \"lcc_description\": \"Naval Science\", \"sum_visitors\": 2, \"sum_visitors_end\": 3.0, \"sum_visitors_start\": 1.0}, {\"country\": \"Canada\", \"lcc_description\": \"Naval Science\", \"sum_visitors\": 1, \"sum_visitors_end\": 1.0, \"sum_visitors_start\": 0.0}]}, {\"name\": \"source_0_y_domain_lcc_description\", \"values\": [{\"lcc_description\": \"Military Science\", \"sort_field\": \"Military Science\"}, {\"lcc_description\": \"History Of The Americas\", \"sort_field\": \"History Of The Americas\"}, {\"lcc_description\": \"Social Sciences\", \"sort_field\": \"Social Sciences\"}, {\"lcc_description\": null, \"sort_field\": null}, {\"lcc_description\": \"Science\", \"sort_field\": \"Science\"}, {\"lcc_description\": \"Medicine\", \"sort_field\": \"Medicine\"}, {\"lcc_description\": \"Language And Literature\", \"sort_field\": \"Language And Literature\"}, {\"lcc_description\": \"Philosophy. Psychology. Religion\", \"sort_field\": \"Philosophy. Psychology. Religion\"}, {\"lcc_description\": \"World History And History Of Europe, Asia, Africa, Australia, New Zealand, Etc.\", \"sort_field\": \"World History And History Of Europe, Asia, Africa, Australia, New Zealand, Etc.\"}, {\"lcc_description\": \"Fine Arts\", \"sort_field\": \"Fine Arts\"}, {\"lcc_description\": \"Education\", \"sort_field\": \"Education\"}, {\"lcc_description\": \"Bibliography. Library Science. Information Resources (General)\", \"sort_field\": \"Bibliography. Library Science. Information Resources (General)\"}, {\"lcc_description\": \"Law\", \"sort_field\": \"Law\"}, {\"lcc_description\": \"Music And Books On Music\", \"sort_field\": \"Music And Books On Music\"}, {\"lcc_description\": \"Geography. Anthropology. Recreation\", \"sort_field\": \"Geography. Anthropology. Recreation\"}, {\"lcc_description\": \"General Works\", \"sort_field\": \"General Works\"}, {\"lcc_description\": \"Agriculture\", \"sort_field\": \"Agriculture\"}, {\"lcc_description\": \"Political Science\", \"sort_field\": \"Political Science\"}, {\"lcc_description\": \"Technology\", \"sort_field\": \"Technology\"}, {\"lcc_description\": \"Auxiliary Sciences Of History\", \"sort_field\": \"Auxiliary Sciences Of History\"}, {\"lcc_description\": \"Naval Science\", \"sort_field\": \"Naval Science\"}]}, {\"name\": \"data_0_color_domain_country\", \"values\": [{\"country\": \"Canada\"}, {\"country\": \"United States\"}, {\"country\": \"United Kingdom\"}]}], \"signals\": [{\"name\": \"y_step\", \"value\": 20}, {\"name\": \"height\", \"update\": \"bandspace(domain('y').length, 0.1, 0.05) * y_step\"}], \"marks\": [{\"type\": \"rect\", \"name\": \"marks\", \"from\": {\"data\": \"data_0\"}, \"encode\": {\"update\": {\"fill\": {\"field\": \"country\", \"scale\": \"color\"}, \"description\": {\"signal\": \"\\\"Sum of visitors: \\\" + (format(datum[\\\"sum_visitors\\\"], \\\"\\\")) + \\\"; lcc_description: \\\" + (isValid(datum[\\\"lcc_description\\\"]) ? datum[\\\"lcc_description\\\"] : \\\"\\\"+datum[\\\"lcc_description\\\"]) + \\\"; country: \\\" + (isValid(datum[\\\"country\\\"]) ? datum[\\\"country\\\"] : \\\"\\\"+datum[\\\"country\\\"])\"}, \"x\": {\"field\": \"sum_visitors_end\", \"scale\": \"x\"}, \"x2\": {\"field\": \"sum_visitors_start\", \"scale\": \"x\"}, \"y\": {\"field\": \"lcc_description\", \"scale\": \"y\"}, \"height\": {\"signal\": \"max(0.25, bandwidth('y'))\"}, \"ariaRoleDescription\": {\"value\": \"bar\"}}}, \"style\": [\"bar\"]}], \"scales\": [{\"name\": \"x\", \"type\": \"linear\", \"domain\": {\"fields\": [\"sum_visitors_start\", \"sum_visitors_end\"], \"data\": \"data_0\"}, \"range\": [0, {\"signal\": \"width\"}], \"nice\": true, \"zero\": true}, {\"name\": \"y\", \"type\": \"band\", \"domain\": {\"data\": \"source_0_y_domain_lcc_description\", \"field\": \"lcc_description\", \"sort\": {\"op\": \"max\", \"field\": \"sort_field\", \"order\": \"descending\"}}, \"range\": {\"step\": {\"signal\": \"y_step\"}}, \"paddingInner\": 0.1, \"paddingOuter\": 0.05}, {\"name\": \"color\", \"type\": \"ordinal\", \"domain\": {\"data\": \"data_0_color_domain_country\", \"field\": \"country\", \"sort\": true}, \"range\": \"category\"}], \"axes\": [{\"scale\": \"x\", \"maxExtent\": 0, \"aria\": false, \"gridScale\": \"y\", \"domain\": false, \"zindex\": 0, \"tickCount\": {\"signal\": \"ceil(width/40)\"}, \"orient\": \"bottom\", \"labels\": false, \"minExtent\": 0, \"grid\": true, \"ticks\": false}, {\"scale\": \"x\", \"labelOverlap\": true, \"tickCount\": {\"signal\": \"ceil(width/40)\"}, \"orient\": \"bottom\", \"zindex\": 0, \"title\": \"Sum of visitors\", \"grid\": false, \"labelFlush\": true}, {\"scale\": \"y\", \"grid\": false, \"title\": \"lcc_description\", \"orient\": \"left\", \"zindex\": 0}], \"padding\": 5, \"legends\": [{\"fill\": \"color\", \"symbolType\": \"square\", \"title\": \"country\"}], \"background\": \"white\", \"style\": \"cell\", \"width\": 300}, {\"mode\": \"vega\"});\n",
       "</script>"
      ],
      "text/plain": [
       "alt.Chart(...)"
      ]
     },
     "execution_count": 10,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "alt.Chart(pageviews).mark_bar().encode(\n",
    "    x = 'sum(visitors)',\n",
    "    y = alt.Y('lcc_description', sort='descending'),\n",
    "    color = 'country'\n",
    ")"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Sorting bars by sum of visitors\n",
    "\n",
    "**Alphabetical ordering is rarely the best choice for a categorical axis!** \n",
    "\n",
    "It's handy for lookup in a long list, but **ordering by a quantity lets us see the patterns in the data more easily, and automatically gives us a ranking of the categories**.\n",
    "\n",
    "There are two equivalent methods to sort the Y axis:\n",
    "- `alt.Y('lcc_description', sort='-x')` *(Attribute syntax – traditional)*\n",
    "- `alt.Y('lcc_description').sort('-x')` ***(Method syntax – introduced in Altair 5, and now preferred)***"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 28,
   "metadata": {},
   "outputs": [
    {
     "data": {
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       "<div id=\"altair-viz-01eb63f479d943be8b5e87b0eb320fdf\"></div>\n",
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       "  var VEGA_DEBUG = (typeof VEGA_DEBUG == \"undefined\") ? {} : VEGA_DEBUG;\n",
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       "    let outputDiv = document.currentScript.previousElementSibling;\n",
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       "      outputDiv = document.getElementById(\"altair-viz-01eb63f479d943be8b5e87b0eb320fdf\");\n",
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       "    const paths = {\n",
       "      \"vega\": \"https://cdn.jsdelivr.net/npm/vega@5?noext\",\n",
       "      \"vega-lib\": \"https://cdn.jsdelivr.net/npm/vega-lib?noext\",\n",
       "      \"vega-lite\": \"https://cdn.jsdelivr.net/npm/vega-lite@5.8.0?noext\",\n",
       "      \"vega-embed\": \"https://cdn.jsdelivr.net/npm/vega-embed@6?noext\",\n",
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       "      outputDiv.innerHTML = `<div class=\"error\" style=\"color:red;\">${err}</div>`;\n",
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       "      vegaEmbed(outputDiv, spec, embedOpt)\n",
       "        .catch(err => showError(`Javascript Error: ${err.message}<br>This usually means there's a typo in your chart specification. See the javascript console for the full traceback.`));\n",
       "    }\n",
       "\n",
       "    if(typeof define === \"function\" && define.amd) {\n",
       "      requirejs.config({paths});\n",
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       "      maybeLoadScript(\"vega\", \"5\")\n",
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Anthropology. Recreation\", \"sum_visitors\": 147, \"sum_visitors_end\": 286.0, \"sum_visitors_start\": 139.0}, {\"country\": \"United States\", \"lcc_description\": \"Law\", \"sum_visitors\": 188, \"sum_visitors_end\": 438.0, \"sum_visitors_start\": 250.0}, {\"country\": \"United Kingdom\", \"lcc_description\": \"Bibliography. Library Science. Information Resources (General)\", \"sum_visitors\": 43, \"sum_visitors_end\": 96.0, \"sum_visitors_start\": 53.0}, {\"country\": \"United Kingdom\", \"lcc_description\": \"General Works\", \"sum_visitors\": 50, \"sum_visitors_end\": 91.0, \"sum_visitors_start\": 41.0}, {\"country\": \"United States\", \"lcc_description\": \"Agriculture\", \"sum_visitors\": 28, \"sum_visitors_end\": 80.0, \"sum_visitors_start\": 52.0}, {\"country\": \"United Kingdom\", \"lcc_description\": \"Political Science\", \"sum_visitors\": 152, \"sum_visitors_end\": 221.0, \"sum_visitors_start\": 69.0}, {\"country\": \"United Kingdom\", \"lcc_description\": \"Geography. Anthropology. Recreation\", \"sum_visitors\": 59, \"sum_visitors_end\": 139.0, \"sum_visitors_start\": 80.0}, {\"country\": \"Canada\", \"lcc_description\": \"Geography. Anthropology. Recreation\", \"sum_visitors\": 80, \"sum_visitors_end\": 80.0, \"sum_visitors_start\": 0.0}, {\"country\": \"Canada\", \"lcc_description\": \"Philosophy. Psychology. Religion\", \"sum_visitors\": 254, \"sum_visitors_end\": 254.0, \"sum_visitors_start\": 0.0}, {\"country\": \"Canada\", \"lcc_description\": \"General Works\", \"sum_visitors\": 41, \"sum_visitors_end\": 41.0, \"sum_visitors_start\": 0.0}, {\"country\": \"Canada\", \"lcc_description\": \"Science\", \"sum_visitors\": 128, \"sum_visitors_end\": 128.0, \"sum_visitors_start\": 0.0}, {\"country\": \"United States\", \"lcc_description\": \"Technology\", \"sum_visitors\": 114, \"sum_visitors_end\": 332.0, \"sum_visitors_start\": 218.0}, {\"country\": \"United States\", \"lcc_description\": \"World History And History Of Europe, Asia, Africa, Australia, New Zealand, Etc.\", \"sum_visitors\": 357, \"sum_visitors_end\": 614.0, \"sum_visitors_start\": 257.0}, {\"country\": \"United Kingdom\", \"lcc_description\": \"Agriculture\", \"sum_visitors\": 21, \"sum_visitors_end\": 52.0, \"sum_visitors_start\": 31.0}, {\"country\": \"Canada\", \"lcc_description\": \"History Of The Americas\", \"sum_visitors\": 88, \"sum_visitors_end\": 88.0, \"sum_visitors_start\": 0.0}, {\"country\": \"United States\", \"lcc_description\": \"General Works\", \"sum_visitors\": 32, \"sum_visitors_end\": 123.0, \"sum_visitors_start\": 91.0}, {\"country\": \"United Kingdom\", \"lcc_description\": \"Music And Books On Music\", \"sum_visitors\": 51, \"sum_visitors_end\": 126.0, \"sum_visitors_start\": 75.0}, {\"country\": \"Canada\", \"lcc_description\": \"Technology\", \"sum_visitors\": 173, \"sum_visitors_end\": 173.0, \"sum_visitors_start\": 0.0}, {\"country\": \"United States\", \"lcc_description\": \"Music And Books On Music\", \"sum_visitors\": 220, \"sum_visitors_end\": 346.0, \"sum_visitors_start\": 126.0}, {\"country\": \"Canada\", \"lcc_description\": \"Political Science\", \"sum_visitors\": 69, \"sum_visitors_end\": 69.0, \"sum_visitors_start\": 0.0}, {\"country\": \"United States\", \"lcc_description\": \"Education\", \"sum_visitors\": 66, \"sum_visitors_end\": 247.0, \"sum_visitors_start\": 181.0}, {\"country\": \"United States\", \"lcc_description\": \"Auxiliary Sciences Of History\", \"sum_visitors\": 35, \"sum_visitors_end\": 78.0, \"sum_visitors_start\": 43.0}, {\"country\": \"Canada\", \"lcc_description\": \"Auxiliary Sciences Of History\", \"sum_visitors\": 20, \"sum_visitors_end\": 20.0, \"sum_visitors_start\": 0.0}, {\"country\": \"United Kingdom\", \"lcc_description\": \"History Of The Americas\", \"sum_visitors\": 104, \"sum_visitors_end\": 192.0, \"sum_visitors_start\": 88.0}, {\"country\": \"United States\", \"lcc_description\": \"Medicine\", \"sum_visitors\": 131, \"sum_visitors_end\": 222.0, \"sum_visitors_start\": 91.0}, {\"country\": \"United States\", \"lcc_description\": \"Military Science\", \"sum_visitors\": 13, \"sum_visitors_end\": 32.0, \"sum_visitors_start\": 19.0}, {\"country\": \"Canada\", \"lcc_description\": \"Fine Arts\", \"sum_visitors\": 81, \"sum_visitors_end\": 81.0, \"sum_visitors_start\": 0.0}, {\"country\": \"United States\", \"lcc_description\": \"Political Science\", \"sum_visitors\": 135, \"sum_visitors_end\": 356.0, \"sum_visitors_start\": 221.0}, {\"country\": \"United Kingdom\", \"lcc_description\": \"Auxiliary Sciences Of History\", \"sum_visitors\": 23, \"sum_visitors_end\": 43.0, \"sum_visitors_start\": 20.0}, {\"country\": \"Canada\", \"lcc_description\": \"Agriculture\", \"sum_visitors\": 31, \"sum_visitors_end\": 31.0, \"sum_visitors_start\": 0.0}, {\"country\": \"United States\", \"lcc_description\": \"Bibliography. Library Science. Information Resources (General)\", \"sum_visitors\": 38, \"sum_visitors_end\": 134.0, \"sum_visitors_start\": 96.0}, {\"country\": \"United Kingdom\", \"lcc_description\": \"Technology\", \"sum_visitors\": 45, \"sum_visitors_end\": 218.0, \"sum_visitors_start\": 173.0}, {\"country\": \"United Kingdom\", \"lcc_description\": \"Medicine\", \"sum_visitors\": 37, \"sum_visitors_end\": 91.0, \"sum_visitors_start\": 54.0}, {\"country\": \"United Kingdom\", \"lcc_description\": \"Military Science\", \"sum_visitors\": 9, \"sum_visitors_end\": 19.0, \"sum_visitors_start\": 10.0}, {\"country\": \"United States\", \"lcc_description\": \"Naval Science\", \"sum_visitors\": 2, \"sum_visitors_end\": 3.0, \"sum_visitors_start\": 1.0}, {\"country\": \"Canada\", \"lcc_description\": \"Naval Science\", \"sum_visitors\": 1, \"sum_visitors_end\": 1.0, \"sum_visitors_start\": 0.0}]}, {\"name\": \"source_0_y_domain_lcc_description\", \"values\": [{\"lcc_description\": \"Military Science\", \"sort_field\": 32}, {\"lcc_description\": \"History Of The Americas\", \"sort_field\": 445}, {\"lcc_description\": \"Social Sciences\", \"sort_field\": 1043}, {\"lcc_description\": null, \"sort_field\": 2007}, {\"lcc_description\": \"Science\", \"sort_field\": 602}, {\"lcc_description\": \"Medicine\", \"sort_field\": 222}, {\"lcc_description\": \"Language And Literature\", \"sort_field\": 1740}, {\"lcc_description\": \"Philosophy. Psychology. Religion\", \"sort_field\": 926}, {\"lcc_description\": \"World History And History Of Europe, Asia, Africa, Australia, New Zealand, Etc.\", \"sort_field\": 614}, {\"lcc_description\": \"Fine Arts\", \"sort_field\": 333}, {\"lcc_description\": \"Education\", \"sort_field\": 247}, {\"lcc_description\": \"Bibliography. Library Science. Information Resources (General)\", \"sort_field\": 134}, {\"lcc_description\": \"Law\", \"sort_field\": 438}, {\"lcc_description\": \"Music And Books On Music\", \"sort_field\": 346}, {\"lcc_description\": \"Geography. Anthropology. Recreation\", \"sort_field\": 286}, {\"lcc_description\": \"General Works\", \"sort_field\": 123}, {\"lcc_description\": \"Agriculture\", \"sort_field\": 80}, {\"lcc_description\": \"Political Science\", \"sort_field\": 356}, {\"lcc_description\": \"Technology\", \"sort_field\": 332}, {\"lcc_description\": \"Auxiliary Sciences Of History\", \"sort_field\": 78}, {\"lcc_description\": \"Naval Science\", \"sort_field\": 3}]}, {\"name\": \"data_0_color_domain_country\", \"values\": [{\"country\": \"Canada\"}, {\"country\": \"United States\"}, {\"country\": \"United Kingdom\"}]}], \"signals\": [{\"name\": \"y_step\", \"value\": 20}, {\"name\": \"height\", \"update\": \"bandspace(domain('y').length, 0.1, 0.05) * y_step\"}], \"marks\": [{\"type\": \"rect\", \"name\": \"marks\", \"from\": {\"data\": \"data_0\"}, \"encode\": {\"update\": {\"ariaRoleDescription\": {\"value\": \"bar\"}, \"fill\": {\"field\": \"country\", \"scale\": \"color\"}, \"height\": {\"signal\": \"max(0.25, bandwidth('y'))\"}, \"y\": {\"field\": \"lcc_description\", \"scale\": \"y\"}, \"x\": {\"field\": \"sum_visitors_end\", \"scale\": \"x\"}, \"x2\": {\"field\": \"sum_visitors_start\", \"scale\": \"x\"}, \"description\": {\"signal\": \"\\\"Sum of visitors: \\\" + (format(datum[\\\"sum_visitors\\\"], \\\"\\\")) + \\\"; lcc_description: \\\" + (isValid(datum[\\\"lcc_description\\\"]) ? datum[\\\"lcc_description\\\"] : \\\"\\\"+datum[\\\"lcc_description\\\"]) + \\\"; country: \\\" + (isValid(datum[\\\"country\\\"]) ? datum[\\\"country\\\"] : \\\"\\\"+datum[\\\"country\\\"])\"}}}, \"style\": [\"bar\"]}], \"scales\": [{\"name\": \"x\", \"type\": \"linear\", \"domain\": {\"fields\": [\"sum_visitors_start\", \"sum_visitors_end\"], \"data\": \"data_0\"}, \"range\": [0, {\"signal\": \"width\"}], \"nice\": true, \"zero\": true}, {\"name\": \"y\", \"type\": \"band\", \"domain\": {\"data\": \"source_0_y_domain_lcc_description\", \"field\": \"lcc_description\", \"sort\": {\"op\": \"max\", \"field\": \"sort_field\", \"order\": \"descending\"}}, \"range\": {\"step\": {\"signal\": \"y_step\"}}, \"paddingInner\": 0.1, \"paddingOuter\": 0.05}, {\"name\": \"color\", \"type\": \"ordinal\", \"domain\": {\"data\": \"data_0_color_domain_country\", \"field\": \"country\", \"sort\": true}, \"range\": \"category\"}], \"axes\": [{\"scale\": \"x\", \"ticks\": false, \"domain\": false, \"maxExtent\": 0, \"tickCount\": {\"signal\": \"ceil(width/40)\"}, \"zindex\": 0, \"minExtent\": 0, \"orient\": \"bottom\", \"aria\": false, \"gridScale\": \"y\", \"labels\": false, \"grid\": true}, {\"scale\": \"x\", \"grid\": false, \"labelFlush\": true, \"tickCount\": {\"signal\": \"ceil(width/40)\"}, \"labelOverlap\": true, \"title\": \"Sum of visitors\", \"zindex\": 0, \"orient\": \"bottom\"}, {\"scale\": \"y\", \"title\": \"lcc_description\", \"zindex\": 0, \"grid\": false, \"orient\": \"left\"}], \"background\": \"white\", \"legends\": [{\"fill\": \"color\", \"symbolType\": \"square\", \"title\": \"country\"}], \"style\": \"cell\", \"width\": 300, \"padding\": 5}, {\"mode\": \"vega\"});\n",
       "</script>"
      ],
      "text/plain": [
       "alt.Chart(...)"
      ]
     },
     "execution_count": 28,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "alt.Chart(pageviews).mark_bar().encode(\n",
    "    x = 'sum(visitors)',\n",
    "    y = alt.Y('lcc_description', sort='-x'),\n",
    "    color = 'country'\n",
    ")"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Log scale on number of visitors\n",
    "\n",
    "Let's introduce a log scale on X, since the x values distribution is a bit skewed. That way it'll be easier to see the small and large values at the same time.\n",
    "\n",
    "**With a log scale you shouldn't use bars, since there's no zero-point, so we'll switch to `mark_point()`**"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "metadata": {},
   "outputs": [
    {
     "data": {
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       "  #altair-viz-b792071ecd034f4aa93629d7cefae48e.vega-embed {\n",
       "    width: 100%;\n",
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       "  }\n",
       "\n",
       "  #altair-viz-b792071ecd034f4aa93629d7cefae48e.vega-embed details,\n",
       "  #altair-viz-b792071ecd034f4aa93629d7cefae48e.vega-embed details summary {\n",
       "    position: relative;\n",
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       "<div id=\"altair-viz-b792071ecd034f4aa93629d7cefae48e\"></div>\n",
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       "  var VEGA_DEBUG = (typeof VEGA_DEBUG == \"undefined\") ? {} : VEGA_DEBUG;\n",
       "  (function(spec, embedOpt){\n",
       "    let outputDiv = document.currentScript.previousElementSibling;\n",
       "    if (outputDiv.id !== \"altair-viz-b792071ecd034f4aa93629d7cefae48e\") {\n",
       "      outputDiv = document.getElementById(\"altair-viz-b792071ecd034f4aa93629d7cefae48e\");\n",
       "    }\n",
       "    const paths = {\n",
       "      \"vega\": \"https://cdn.jsdelivr.net/npm/vega@5?noext\",\n",
       "      \"vega-lib\": \"https://cdn.jsdelivr.net/npm/vega-lib?noext\",\n",
       "      \"vega-lite\": \"https://cdn.jsdelivr.net/npm/vega-lite@5.8.0?noext\",\n",
       "      \"vega-embed\": \"https://cdn.jsdelivr.net/npm/vega-embed@6?noext\",\n",
       "    };\n",
       "\n",
       "    function maybeLoadScript(lib, version) {\n",
       "      var key = `${lib.replace(\"-\", \"\")}_version`;\n",
       "      return (VEGA_DEBUG[key] == version) ?\n",
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       "    function showError(err) {\n",
       "      outputDiv.innerHTML = `<div class=\"error\" style=\"color:red;\">${err}</div>`;\n",
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       "    function displayChart(vegaEmbed) {\n",
       "      vegaEmbed(outputDiv, spec, embedOpt)\n",
       "        .catch(err => showError(`Javascript Error: ${err.message}<br>This usually means there's a typo in your chart specification. See the javascript console for the full traceback.`));\n",
       "    }\n",
       "\n",
       "    if(typeof define === \"function\" && define.amd) {\n",
       "      requirejs.config({paths});\n",
       "      require([\"vega-embed\"], displayChart, err => showError(`Error loading script: ${err.message}`));\n",
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       "      maybeLoadScript(\"vega\", \"5\")\n",
       "        .then(() => maybeLoadScript(\"vega-lite\", \"5.8.0\"))\n",
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       "  })({\"$schema\": \"https://vega.github.io/schema/vega/v5.json\", \"data\": [{\"name\": \"source_0\"}, {\"name\": \"data_0\", \"values\": [{\"country\": \"Canada\", \"lcc_description\": \"Military Science\", \"sum_visitors\": 10}, {\"country\": \"United States\", \"lcc_description\": \"History Of The Americas\", \"sum_visitors\": 253}, {\"country\": \"United Kingdom\", \"lcc_description\": \"Social Sciences\", \"sum_visitors\": 238}, {\"country\": \"United Kingdom\", \"lcc_description\": null, \"sum_visitors\": 653}, {\"country\": \"United Kingdom\", \"lcc_description\": \"Science\", \"sum_visitors\": 103}, {\"country\": \"Canada\", \"lcc_description\": \"Medicine\", \"sum_visitors\": 54}, {\"country\": \"Canada\", \"lcc_description\": \"Language And Literature\", \"sum_visitors\": 401}, {\"country\": \"United Kingdom\", \"lcc_description\": \"Philosophy. Psychology. 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Religion\", \"sum_visitors\": 524}, {\"country\": \"United States\", \"lcc_description\": \"Social Sciences\", \"sum_visitors\": 608}, {\"country\": \"United Kingdom\", \"lcc_description\": \"Education\", \"sum_visitors\": 44}, {\"country\": \"Canada\", \"lcc_description\": \"Social Sciences\", \"sum_visitors\": 197}, {\"country\": \"Canada\", \"lcc_description\": \"Bibliography. Library Science. Information Resources (General)\", \"sum_visitors\": 53}, {\"country\": \"United States\", \"lcc_description\": null, \"sum_visitors\": 792}, {\"country\": \"United Kingdom\", \"lcc_description\": \"Law\", \"sum_visitors\": 118}, {\"country\": \"Canada\", \"lcc_description\": \"Education\", \"sum_visitors\": 137}, {\"country\": \"Canada\", \"lcc_description\": \"Music And Books On Music\", \"sum_visitors\": 75}, {\"country\": \"United Kingdom\", \"lcc_description\": \"Fine Arts\", \"sum_visitors\": 88}, {\"country\": \"Canada\", \"lcc_description\": \"World History And History Of Europe, Asia, Africa, Australia, New Zealand, Etc.\", \"sum_visitors\": 131}, {\"country\": \"United States\", \"lcc_description\": \"Language And Literature\", \"sum_visitors\": 1023}, {\"country\": \"Canada\", \"lcc_description\": \"Law\", \"sum_visitors\": 132}, {\"country\": \"United States\", \"lcc_description\": \"Geography. Anthropology. Recreation\", \"sum_visitors\": 147}, {\"country\": \"United States\", \"lcc_description\": \"Law\", \"sum_visitors\": 188}, {\"country\": \"United Kingdom\", \"lcc_description\": \"Bibliography. Library Science. Information Resources (General)\", \"sum_visitors\": 43}, {\"country\": \"United Kingdom\", \"lcc_description\": \"General Works\", \"sum_visitors\": 50}, {\"country\": \"United States\", \"lcc_description\": \"Agriculture\", \"sum_visitors\": 28}, {\"country\": \"United Kingdom\", \"lcc_description\": \"Political Science\", \"sum_visitors\": 152}, {\"country\": \"United Kingdom\", \"lcc_description\": \"Geography. Anthropology. Recreation\", \"sum_visitors\": 59}, {\"country\": \"Canada\", \"lcc_description\": \"Geography. Anthropology. Recreation\", \"sum_visitors\": 80}, {\"country\": \"Canada\", \"lcc_description\": \"Philosophy. Psychology. Religion\", \"sum_visitors\": 254}, {\"country\": \"Canada\", \"lcc_description\": \"General Works\", \"sum_visitors\": 41}, {\"country\": \"Canada\", \"lcc_description\": \"Science\", \"sum_visitors\": 128}, {\"country\": \"United States\", \"lcc_description\": \"Technology\", \"sum_visitors\": 114}, {\"country\": \"United States\", \"lcc_description\": \"World History And History Of Europe, Asia, Africa, Australia, New Zealand, Etc.\", \"sum_visitors\": 357}, {\"country\": \"United Kingdom\", \"lcc_description\": \"Agriculture\", \"sum_visitors\": 21}, {\"country\": \"Canada\", \"lcc_description\": \"History Of The Americas\", \"sum_visitors\": 88}, {\"country\": \"United States\", \"lcc_description\": \"General Works\", \"sum_visitors\": 32}, {\"country\": \"United Kingdom\", \"lcc_description\": \"Music And Books On Music\", \"sum_visitors\": 51}, {\"country\": \"Canada\", \"lcc_description\": \"Technology\", \"sum_visitors\": 173}, {\"country\": \"United States\", \"lcc_description\": \"Music And Books On Music\", \"sum_visitors\": 220}, {\"country\": \"Canada\", \"lcc_description\": \"Political Science\", \"sum_visitors\": 69}, {\"country\": \"United States\", \"lcc_description\": \"Education\", \"sum_visitors\": 66}, {\"country\": \"United States\", \"lcc_description\": \"Auxiliary Sciences Of History\", \"sum_visitors\": 35}, {\"country\": \"Canada\", \"lcc_description\": \"Auxiliary Sciences Of History\", \"sum_visitors\": 20}, {\"country\": \"United Kingdom\", \"lcc_description\": \"History Of The Americas\", \"sum_visitors\": 104}, {\"country\": \"United States\", \"lcc_description\": \"Medicine\", \"sum_visitors\": 131}, {\"country\": \"United States\", \"lcc_description\": \"Military Science\", \"sum_visitors\": 13}, {\"country\": \"Canada\", \"lcc_description\": \"Fine Arts\", \"sum_visitors\": 81}, {\"country\": \"United States\", \"lcc_description\": \"Political Science\", \"sum_visitors\": 135}, {\"country\": \"United Kingdom\", \"lcc_description\": \"Auxiliary Sciences Of History\", \"sum_visitors\": 23}, {\"country\": \"Canada\", \"lcc_description\": \"Agriculture\", \"sum_visitors\": 31}, {\"country\": \"United States\", \"lcc_description\": \"Bibliography. Library Science. Information Resources (General)\", \"sum_visitors\": 38}, {\"country\": \"United Kingdom\", \"lcc_description\": \"Technology\", \"sum_visitors\": 45}, {\"country\": \"United Kingdom\", \"lcc_description\": \"Medicine\", \"sum_visitors\": 37}, {\"country\": \"United Kingdom\", \"lcc_description\": \"Military Science\", \"sum_visitors\": 9}, {\"country\": \"United States\", \"lcc_description\": \"Naval Science\", \"sum_visitors\": 2}, {\"country\": \"Canada\", \"lcc_description\": \"Naval Science\", \"sum_visitors\": 1}]}, {\"name\": \"source_0_y_domain_lcc_description\", \"values\": [{\"lcc_description\": \"Military Science\", \"sort_field\": 32}, {\"lcc_description\": \"History Of The Americas\", \"sort_field\": 445}, {\"lcc_description\": \"Social Sciences\", \"sort_field\": 1043}, {\"lcc_description\": null, \"sort_field\": 2007}, {\"lcc_description\": \"Science\", \"sort_field\": 602}, {\"lcc_description\": \"Medicine\", \"sort_field\": 222}, {\"lcc_description\": \"Language And Literature\", \"sort_field\": 1740}, {\"lcc_description\": \"Philosophy. Psychology. Religion\", \"sort_field\": 926}, {\"lcc_description\": \"World History And History Of Europe, Asia, Africa, Australia, New Zealand, Etc.\", \"sort_field\": 614}, {\"lcc_description\": \"Fine Arts\", \"sort_field\": 333}, {\"lcc_description\": \"Education\", \"sort_field\": 247}, {\"lcc_description\": \"Bibliography. Library Science. Information Resources (General)\", \"sort_field\": 134}, {\"lcc_description\": \"Law\", \"sort_field\": 438}, {\"lcc_description\": \"Music And Books On Music\", \"sort_field\": 346}, {\"lcc_description\": \"Geography. Anthropology. Recreation\", \"sort_field\": 286}, {\"lcc_description\": \"General Works\", \"sort_field\": 123}, {\"lcc_description\": \"Agriculture\", \"sort_field\": 80}, {\"lcc_description\": \"Political Science\", \"sort_field\": 356}, {\"lcc_description\": \"Technology\", \"sort_field\": 332}, {\"lcc_description\": \"Auxiliary Sciences Of History\", \"sort_field\": 78}, {\"lcc_description\": \"Naval Science\", \"sort_field\": 3}]}, {\"name\": \"data_0_color_domain_country\", \"values\": [{\"country\": \"Canada\"}, {\"country\": \"United States\"}, {\"country\": \"United Kingdom\"}]}, {\"name\": \"data_0_shape_domain_country\", \"values\": [{\"country\": \"Canada\"}, {\"country\": \"United States\"}, {\"country\": \"United Kingdom\"}]}], \"signals\": [{\"name\": \"y_step\", \"value\": 20}, {\"name\": \"height\", \"update\": \"bandspace(domain('y').length, 1, 0.5) * y_step\"}], \"marks\": [{\"type\": \"symbol\", \"name\": \"marks\", \"from\": {\"data\": \"data_0\"}, \"encode\": {\"update\": {\"fill\": {\"value\": \"transparent\"}, \"stroke\": {\"field\": \"country\", \"scale\": \"color\"}, \"x\": {\"field\": \"sum_visitors\", \"scale\": \"x\"}, \"y\": {\"field\": \"lcc_description\", \"scale\": \"y\"}, \"shape\": {\"field\": \"country\", \"scale\": \"shape\"}, \"ariaRoleDescription\": {\"value\": \"point\"}, \"description\": {\"signal\": \"\\\"Sum of visitors: \\\" + (format(datum[\\\"sum_visitors\\\"], \\\"\\\")) + \\\"; lcc_description: \\\" + (isValid(datum[\\\"lcc_description\\\"]) ? datum[\\\"lcc_description\\\"] : \\\"\\\"+datum[\\\"lcc_description\\\"]) + \\\"; country: \\\" + (isValid(datum[\\\"country\\\"]) ? datum[\\\"country\\\"] : \\\"\\\"+datum[\\\"country\\\"])\"}}}, \"style\": [\"point\"]}], \"scales\": [{\"name\": \"x\", \"type\": \"log\", \"domain\": {\"data\": \"data_0\", \"field\": \"sum_visitors\"}, \"range\": [0, {\"signal\": \"width\"}], \"nice\": true}, {\"name\": \"y\", \"type\": \"point\", \"domain\": {\"data\": \"source_0_y_domain_lcc_description\", \"field\": \"lcc_description\", \"sort\": {\"op\": \"max\", \"field\": \"sort_field\", \"order\": \"descending\"}}, \"range\": {\"step\": {\"signal\": \"y_step\"}}, \"padding\": 0.5}, {\"name\": \"color\", \"type\": \"ordinal\", \"domain\": {\"data\": \"data_0_color_domain_country\", \"field\": \"country\", \"sort\": true}, \"range\": \"category\"}, {\"name\": \"shape\", \"type\": \"ordinal\", \"domain\": {\"data\": \"data_0_shape_domain_country\", \"field\": \"country\", \"sort\": true}, \"range\": \"symbol\"}], \"axes\": [{\"scale\": \"x\", \"grid\": true, \"labels\": false, \"ticks\": false, \"gridScale\": \"y\", \"aria\": false, \"zindex\": 0, \"orient\": \"bottom\", \"domain\": false, \"minExtent\": 0, \"maxExtent\": 0}, {\"scale\": \"x\", \"labelOverlap\": \"greedy\", \"zindex\": 0, \"labelFlush\": true, \"grid\": false, \"orient\": \"bottom\", \"title\": \"Sum of visitors\"}, {\"scale\": \"y\", \"zindex\": 0, \"title\": \"lcc_description\", \"grid\": false, \"orient\": \"left\"}], \"padding\": 5, \"width\": 300, \"background\": \"white\", \"style\": \"cell\", \"legends\": [{\"stroke\": \"color\", \"symbolType\": \"circle\", \"title\": \"country\", \"encode\": {\"symbols\": {\"update\": {\"fill\": {\"value\": \"transparent\"}}}}, \"shape\": \"shape\"}]}, {\"mode\": \"vega\"});\n",
       "</script>"
      ],
      "text/plain": [
       "alt.Chart(...)"
      ]
     },
     "execution_count": 12,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "log_symbols_plot = alt.Chart(pageviews).mark_point().encode(\n",
    "    x = alt.X('sum(visitors)').scale(type='log'),\n",
    "    y = alt.Y('lcc_description').sort('-x'),\n",
    "    color = 'country',\n",
    "    shape = 'country'\n",
    ")\n",
    "\n",
    "log_symbols_plot"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Configuring grid lines\n",
    "\n",
    "Altair's default is to put grid lines on a quantitative axis, but here let's use grids on the categorical Y-axis to help us associate the labels with the points.\n",
    "\n",
    "- We could add an `axis=alt.Axis(grid=True)` or `grid=False` to the individual encoding X and Y fields\n",
    "- If we wanted to control both X and Y together, we could add a `.configure_axis(grid=True)` to the Chart\n",
    "- Here we'll turn on Y axis grids with  `.configure_axisY(grid=True)`\n",
    "\n",
    "The grid lines in Altair can only go where there are axis values, so if we wanted to control the number of grid lines for the x-axis, we would need to manually set the values."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 13,
   "metadata": {},
   "outputs": [
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       "</script>"
      ],
      "text/plain": [
       "alt.Chart(...)"
      ]
     },
     "execution_count": 13,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "log_symbols_plot.encode(\n",
    "    x = alt.X('sum(visitors)')\n",
    "                .scale(type='log')\n",
    "                .axis(values=[1,10,100,1000,10000])\n",
    ").configure_axisY(grid=True)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Alternative log scales\n",
    "\n",
    "Sometimes the numbers and lookup work out better if you do **a log scale that's not base 10.**"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 14,
   "metadata": {},
   "outputs": [
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      "text/plain": [
       "alt.Chart(...)"
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     "execution_count": 14,
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    }
   ],
   "source": [
    "log_symbols_plot.encode(\n",
    "    x = alt.X('sum(visitors)')\n",
    "                .scale(type='log', base=2)\n",
    ").configure_axisY(grid=True)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "---\n",
    "\n",
    "# TimeUnit transform: \n",
    "\n",
    "## Visitors continuous time line\n",
    "\n",
    "**For time series, it's often useless to view our data in the original fine event detail!** \n",
    "\n",
    "If we look at timestamps and visitors directly, it looks like a bunch of very closely spaced ones with a few twos and threes, etc."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 15,
   "metadata": {},
   "outputs": [
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       "</script>"
      ],
      "text/plain": [
       "alt.Chart(...)"
      ]
     },
     "execution_count": 15,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "alt.Chart(pageviews.iloc[5250:5350,:]).mark_point().encode(\n",
    "    x = 'timestamp:T',\n",
    "    y = 'visitors:Q'\n",
    ").properties(\n",
    "    width=400,\n",
    "    height=150\n",
    ")"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Time aggregation\n",
    "\n",
    "We'd like to aggregate it on different time scales to see what patterns pop out. We saw some aggregation already with the `sum(visitors)` and sorting, but **Altair has many built-in time-scale aggregation functions, too, called TimeUnit Transforms.**\n",
    "\n",
    "**The documentation lists the \n",
    "[Timeunit valid entries](https://altair-viz.github.io/user_guide/transform/timeunit.html)**\n",
    "\n",
    "### A sum of visitors per month shows some seasonal detail\n",
    "\n",
    "Here we'll try a couple of different time scales on which to aggregate. First, monthly with `yearmonth()` to see the very coarse-scale trends over the academic year."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 16,
   "metadata": {},
   "outputs": [
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       "</script>"
      ],
      "text/plain": [
       "alt.Chart(...)"
      ]
     },
     "execution_count": 16,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "alt.Chart(pageviews).mark_line().encode(\n",
    "    x = 'yearmonth(timestamp):T',\n",
    "    y = 'sum(visitors):Q'\n",
    ").properties(\n",
    "    width=400,\n",
    "    height=150\n",
    ")"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Sum of visitors per day adds within-week detail\n",
    "\n",
    "`yearmonthdate()` retains all of these, the year month and date, aggregating to the day level."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 17,
   "metadata": {},
   "outputs": [
    {
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       "</script>"
      ],
      "text/plain": [
       "alt.Chart(...)"
      ]
     },
     "execution_count": 17,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "alt.Chart(pageviews).mark_line().encode(\n",
    "    x = 'yearmonthdate(timestamp):T',\n",
    "    y = 'sum(visitors):Q'\n",
    ").properties(\n",
    "    width=600,\n",
    "    height=150\n",
    ")"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "---\n",
    "\n",
    "### Weekly sums\n",
    "\n",
    "**I wish Altair had a built-in time unit transform for *weekly* sum, average, etc.** If you want to see an example of how to do that tranform using Pandas, and then feed it into Altair, check out the\n",
    "[WeeklyTimeAggregation](WeeklyTimeAggregation.ipynb) notebook!\n",
    "\n",
    "---"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Just Durham data using transform_filter()\n",
    "\n",
    "**You can see the school holidays more clearly in the Durham pageviews** as subtle drops in the number of visitors.\n",
    "\n",
    "*Note: **datum is just a way to reference the data elements in each row** instead of a whole column*\n",
    "\n",
    "*Note also, that if we have lots of data, these types of filtering operations are faster in Pandas than in Altair, so you can pre-filter your data before feeding it to Altair.*"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 18,
   "metadata": {},
   "outputs": [
    {
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       "</script>"
      ],
      "text/plain": [
       "alt.Chart(...)"
      ]
     },
     "execution_count": 18,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "alt.Chart(pageviews).mark_line().encode(\n",
    "    x = 'yearmonthdate(timestamp):T',\n",
    "    y = 'sum(visitors):Q',\n",
    "    tooltip = 'yearmonthdate(timestamp):T'\n",
    ").transform_filter(\n",
    "    datum.city == 'Durham'\n",
    ").properties(\n",
    "    width=600,\n",
    "    height=150\n",
    ")"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### The patterns are less clear on a heatmap\n",
    "\n",
    "This shows how the particular design of the visualization can strongly affect what patterns we see in the data. This view would be better if, say, people visited the site more at the beginnning of each month."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 19,
   "metadata": {},
   "outputs": [
    {
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{\"date_timestamp\": \"2012-01-16T00:00:00.000\"}, {\"date_timestamp\": \"2012-01-17T00:00:00.000\"}, {\"date_timestamp\": \"2012-01-18T00:00:00.000\"}, {\"date_timestamp\": \"2012-01-19T00:00:00.000\"}, {\"date_timestamp\": \"2012-01-20T00:00:00.000\"}, {\"date_timestamp\": \"2012-01-21T00:00:00.000\"}, {\"date_timestamp\": \"2012-01-22T00:00:00.000\"}, {\"date_timestamp\": \"2012-01-23T00:00:00.000\"}, {\"date_timestamp\": \"2012-01-24T00:00:00.000\"}, {\"date_timestamp\": \"2012-01-25T00:00:00.000\"}, {\"date_timestamp\": \"2012-01-26T00:00:00.000\"}, {\"date_timestamp\": \"2012-01-27T00:00:00.000\"}, {\"date_timestamp\": \"2012-01-28T00:00:00.000\"}, {\"date_timestamp\": \"2012-01-29T00:00:00.000\"}, {\"date_timestamp\": \"2012-01-30T00:00:00.000\"}, {\"date_timestamp\": \"2012-01-31T00:00:00.000\"}], \"transform\": [{\"type\": \"formula\", \"expr\": \"toDate(datum['date_timestamp'])\", \"as\": \"date_timestamp\"}]}, {\"name\": \"source_0_y_domain_month_timestamp\", \"values\": [{\"month_timestamp\": \"2012-01-01T00:00:00.000\"}, {\"month_timestamp\": \"2012-02-01T00:00:00.000\"}, {\"month_timestamp\": \"2012-03-01T00:00:00.000\"}, {\"month_timestamp\": \"2012-04-01T00:00:00.000\"}, {\"month_timestamp\": \"2012-05-01T00:00:00.000\"}, {\"month_timestamp\": \"2012-06-01T00:00:00.000\"}, {\"month_timestamp\": \"2012-07-01T00:00:00.000\"}, {\"month_timestamp\": \"2012-08-01T00:00:00.000\"}, {\"month_timestamp\": \"2012-09-01T00:00:00.000\"}, {\"month_timestamp\": \"2012-10-01T00:00:00.000\"}, {\"month_timestamp\": \"2012-11-01T00:00:00.000\"}, {\"month_timestamp\": \"2012-12-01T00:00:00.000\"}], \"transform\": [{\"type\": \"formula\", \"expr\": \"toDate(datum['month_timestamp'])\", \"as\": \"month_timestamp\"}]}, {\"name\": \"source_0_color_domain_sum_visitors\", \"values\": [{\"min\": 1, \"max\": 38}]}], \"signals\": [{\"name\": \"child_width\", \"value\": 450}, {\"name\": \"child_height\", \"value\": 160}], \"marks\": [{\"type\": \"group\", \"name\": \"row-title\", \"title\": {\"text\": \"timestamp (year)\", \"offset\": 10, \"orient\": \"left\", \"style\": \"guide-title\"}, \"role\": \"row-title\"}, {\"type\": \"group\", \"name\": \"row_header\", \"from\": {\"data\": \"row_domain\"}, \"sort\": {\"field\": \"datum[\\\"year_timestamp\\\"]\", \"order\": \"ascending\"}, \"encode\": {\"update\": {\"height\": {\"signal\": \"child_height\"}}}, \"axes\": [{\"scale\": \"y\", \"formatType\": \"time\", \"format\": {\"signal\": \"timeUnitSpecifier([\\\"month\\\"], {\\\"year-month\\\":\\\"%b %Y \\\",\\\"year-month-date\\\":\\\"%b %d, %Y \\\"})\"}, \"grid\": false, \"orient\": \"left\", \"title\": \"month\", \"labelOverlap\": true, \"zindex\": 1, \"tickMinStep\": {\"signal\": \"datetime(2001, 1, 1, 0, 0, 0, 0) - datetime(2001, 0, 1, 0, 0, 0, 0)\"}}], \"title\": {\"text\": {\"signal\": \"timeFormat(parent[\\\"year_timestamp\\\"], timeUnitSpecifier([\\\"year\\\"], {\\\"year-month\\\":\\\"%b %Y \\\",\\\"year-month-date\\\":\\\"%b %d, %Y \\\"}))\"}, \"style\": \"guide-label\", \"frame\": \"group\", \"orient\": \"left\", \"offset\": 10}, \"role\": \"row-header\"}, {\"type\": \"group\", \"name\": \"column_footer\", \"encode\": {\"update\": {\"width\": {\"signal\": \"child_width\"}}}, \"axes\": [{\"scale\": \"x\", \"formatType\": \"time\", \"orient\": \"bottom\", \"grid\": false, \"zindex\": 1, \"labelOverlap\": true, \"format\": {\"signal\": \"timeUnitSpecifier([\\\"date\\\"], {\\\"year-month\\\":\\\"%b %Y \\\",\\\"year-month-date\\\":\\\"%b %d, %Y \\\"})\"}, \"tickMinStep\": {\"signal\": \"datetime(2001, 0, 2, 0, 0, 0, 0) - datetime(2001, 0, 1, 0, 0, 0, 0)\"}, \"title\": \"day\"}], \"role\": \"column-footer\"}, {\"type\": \"group\", \"name\": \"cell\", \"from\": {\"facet\": {\"data\": \"source_0\", \"name\": \"facet\", \"groupby\": [\"year_timestamp\"]}}, \"sort\": {\"field\": [\"datum[\\\"year_timestamp\\\"]\"], \"order\": [\"ascending\"]}, \"encode\": {\"update\": {\"width\": {\"signal\": \"child_width\"}, \"height\": {\"signal\": \"child_height\"}}}, \"marks\": [{\"type\": \"rect\", \"name\": \"child_marks\", \"from\": {\"data\": \"facet\"}, \"encode\": {\"update\": {\"height\": {\"signal\": \"max(0.25, bandwidth('y'))\"}, \"fill\": {\"field\": \"sum_visitors\", \"scale\": \"color\"}, \"description\": {\"signal\": \"\\\"day: \\\" + (timeFormat(datum[\\\"date_timestamp\\\"], timeUnitSpecifier([\\\"date\\\"], {\\\"year-month\\\":\\\"%b %Y \\\",\\\"year-month-date\\\":\\\"%b %d, %Y \\\"}))) + \\\"; month: \\\" + (timeFormat(datum[\\\"month_timestamp\\\"], timeUnitSpecifier([\\\"month\\\"], {\\\"year-month\\\":\\\"%b %Y \\\",\\\"year-month-date\\\":\\\"%b %d, %Y \\\"}))) + \\\"; Sum of visitors: \\\" + (format(datum[\\\"sum_visitors\\\"], \\\"\\\"))\"}, \"width\": {\"signal\": \"max(0.25, bandwidth('x'))\"}, \"x\": {\"field\": \"date_timestamp\", \"scale\": \"x\"}, \"y\": {\"field\": \"month_timestamp\", \"scale\": \"y\"}}}, \"style\": [\"rect\"]}], \"style\": \"cell\"}], \"scales\": [{\"name\": \"x\", \"type\": \"band\", \"domain\": {\"data\": \"source_0_x_domain_date_timestamp\", \"field\": \"date_timestamp\", \"sort\": true}, \"range\": [0, {\"signal\": \"child_width\"}], \"paddingInner\": 0, \"paddingOuter\": 0}, {\"name\": \"y\", \"type\": \"band\", \"domain\": {\"data\": \"source_0_y_domain_month_timestamp\", \"field\": \"month_timestamp\", \"sort\": true}, \"range\": [0, {\"signal\": \"child_height\"}], \"paddingOuter\": 0, \"paddingInner\": 0}, {\"name\": \"color\", \"type\": \"linear\", \"domain\": [{\"signal\": \"(data(\\\"source_0_color_domain_sum_visitors\\\")[0] || {}).min\"}, {\"signal\": \"(data(\\\"source_0_color_domain_sum_visitors\\\")[0] || {}).max\"}], \"range\": \"heatmap\", \"zero\": false, \"interpolate\": \"hcl\"}], \"title\": {\"text\": \"Number of visitors to library web pages per day\", \"anchor\": \"start\"}, \"background\": \"white\", \"padding\": 5, \"layout\": {\"padding\": 20, \"offset\": {\"rowTitle\": 10}, \"columns\": 1, \"bounds\": \"full\", \"align\": \"all\"}, \"legends\": [{\"fill\": \"color\", \"gradientLength\": {\"signal\": \"clamp(child_height, 64, 200)\"}, \"title\": \"Sum of visitors\"}]}, {\"mode\": \"vega\"});\n",
       "</script>"
      ],
      "text/plain": [
       "alt.Chart(...)"
      ]
     },
     "execution_count": 19,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "alt.Chart(pageviews).mark_rect().encode(\n",
    "    alt.X('date(timestamp):O', title='day'),\n",
    "    alt.Y('month(timestamp):O', title='month'),\n",
    "    color='sum(visitors):Q',\n",
    "    row='year(timestamp):O'\n",
    ").transform_filter(\n",
    "    datum.city == 'Durham'\n",
    ").properties(\n",
    "    width=450,\n",
    "    height=160,\n",
    "    title=\"Number of visitors to library web pages per day\"\n",
    ")"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## TimeUnit transform: Visitors by hour of day\n",
    "\n",
    "We did the days of the week earlier. Another interesting visualization is hours of the day.\n",
    "\n",
    "If you wanted to make a bar chart out of this, you'd need to change to `mark_bar()`, as well as `T` data type to ordinal `O`."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 20,
   "metadata": {},
   "outputs": [
    {
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       "alt.Chart(...)"
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     "execution_count": 20,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "alt.Chart(pageviews).mark_line().encode(\n",
    "    x = 'hours(timestamp):T',\n",
    "    y = 'sum(visitors):Q'\n",
    ")"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Canada, UK time shift\n",
    "\n",
    "If we filter down to just Canadian and UK visitors, and color by country, we can see a shift in the peak viewing time of day corresponding to their respective time zones."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 21,
   "metadata": {},
   "outputs": [
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\"sum_visitors\": 19}, {\"hours_timestamp\": \"2012-01-01T22:00:00.000\", \"country\": \"United Kingdom\", \"sum_visitors\": 9}], \"transform\": [{\"type\": \"formula\", \"expr\": \"toDate(datum['hours_timestamp'])\", \"as\": \"hours_timestamp\"}]}, {\"name\": \"source_0_y_domain_sum_visitors\", \"values\": [{\"min\": 9, \"max\": 252}]}, {\"name\": \"source_0_color_domain_country\", \"values\": [{\"country\": \"Canada\"}, {\"country\": \"United Kingdom\"}]}], \"marks\": [{\"type\": \"group\", \"name\": \"pathgroup\", \"from\": {\"facet\": {\"data\": \"source_0\", \"name\": \"faceted_path_main\", \"groupby\": [\"country\"]}}, \"encode\": {\"update\": {\"height\": {\"field\": {\"signal\": null, \"datum\": null, \"group\": \"height\", \"parent\": null}}, \"width\": {\"field\": {\"signal\": null, \"datum\": null, \"group\": \"width\", \"parent\": null}}}}, \"marks\": [{\"type\": \"line\", \"name\": \"marks\", \"from\": {\"data\": \"faceted_path_main\"}, \"sort\": {\"field\": 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       "</script>"
      ],
      "text/plain": [
       "alt.Chart(...)"
      ]
     },
     "execution_count": 21,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "alt.Chart(pageviews).mark_line().encode(\n",
    "    x = 'hours(timestamp):T',\n",
    "    y = 'sum(visitors):Q',\n",
    "    color = 'country'\n",
    ").transform_filter(\n",
    "    (datum.country == 'Canada') | (datum.country == 'United Kingdom')\n",
    ")"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "---\n",
    "\n",
    "## EXERCISE 2: Weekday vs hour of day heatmap\n",
    "\n",
    "A heatmap is a compact way to view typical patterns throughout the day, and how that varies by weekday.\n",
    "\n",
    "Now, put together the earlier examples to create the visualization below. Days of the week are on the vertical axis, hours of the day are on the horizontal, and color is the number of visitors. *(I've removed some of the axis labels to hide hints from you.)*\n",
    "\n",
    "*Hint: you need to change from a Time data type to Ordinal to get discreet marks*\n",
    "\n",
    "![goal heatmap](images/libweekhoursheatmap.png)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "---\n",
    "\n",
    "## Facet wrapping\n",
    "\n",
    "Recently, Altair (or Vega-Lite) added the ability to \"wrap\" facets, so if you have facets over a lot of categories, you can control how wide or tall the grid of plots gets.\n",
    "\n",
    "- *Note: When I tried to facet with `lcc_description` Altair didn't elide the category text, so the plots were spaced out too wide. See the Pandas documentation on [working with text data](https://pandas.pydata.org/pandas-docs/stable/user_guide/text.html) for an explanation of the truncation I used.*\n",
    "- *I'm going to plot without null LCC since it makes the truncation easier, and it results in a grid of 20 rather than 21.*\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 22,
   "metadata": {},
   "outputs": [
    {
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Library\", \"sum_visitors\": 1}, {\"yearmonthdate_timestamp\": \"2012-12-22T00:00:00.000\", \"short_lcc\": \"Political Science\", \"sum_visitors\": 1}, {\"yearmonthdate_timestamp\": \"2012-12-22T00:00:00.000\", \"short_lcc\": \"History Of\", \"sum_visitors\": 1}, {\"yearmonthdate_timestamp\": \"2012-12-22T00:00:00.000\", \"short_lcc\": \"Social Sciences\", \"sum_visitors\": 1}, {\"yearmonthdate_timestamp\": \"2012-12-22T00:00:00.000\", \"short_lcc\": \"Language And\", \"sum_visitors\": 4}, {\"yearmonthdate_timestamp\": \"2012-12-22T00:00:00.000\", \"short_lcc\": \"Education\", \"sum_visitors\": 1}, {\"yearmonthdate_timestamp\": \"2012-12-23T00:00:00.000\", \"short_lcc\": \"Agriculture\", \"sum_visitors\": 1}, {\"yearmonthdate_timestamp\": \"2012-12-23T00:00:00.000\", \"short_lcc\": \"Auxiliary Sciences\", \"sum_visitors\": 1}, {\"yearmonthdate_timestamp\": \"2012-12-23T00:00:00.000\", \"short_lcc\": \"Science\", \"sum_visitors\": 1}, {\"yearmonthdate_timestamp\": \"2012-12-23T00:00:00.000\", \"short_lcc\": \"Fine Arts\", \"sum_visitors\": 1}, {\"yearmonthdate_timestamp\": \"2012-12-23T00:00:00.000\", \"short_lcc\": \"Music And\", \"sum_visitors\": 1}, {\"yearmonthdate_timestamp\": \"2012-12-23T00:00:00.000\", \"short_lcc\": \"History Of\", \"sum_visitors\": 2}, {\"yearmonthdate_timestamp\": \"2012-12-23T00:00:00.000\", \"short_lcc\": \"Law\", \"sum_visitors\": 1}, {\"yearmonthdate_timestamp\": \"2012-12-24T00:00:00.000\", \"short_lcc\": \"Music And\", \"sum_visitors\": 1}, {\"yearmonthdate_timestamp\": \"2012-12-24T00:00:00.000\", \"short_lcc\": \"Technology\", \"sum_visitors\": 1}, {\"yearmonthdate_timestamp\": \"2012-12-24T00:00:00.000\", \"short_lcc\": \"Language And\", \"sum_visitors\": 1}, {\"yearmonthdate_timestamp\": \"2012-12-25T00:00:00.000\", \"short_lcc\": \"Technology\", \"sum_visitors\": 2}, {\"yearmonthdate_timestamp\": \"2012-12-25T00:00:00.000\", \"short_lcc\": \"Science\", \"sum_visitors\": 1}, {\"yearmonthdate_timestamp\": \"2012-12-25T00:00:00.000\", \"short_lcc\": \"Geography. Anthropology.\", \"sum_visitors\": 1}, {\"yearmonthdate_timestamp\": \"2012-12-25T00:00:00.000\", \"short_lcc\": \"Philosophy. Psychology.\", \"sum_visitors\": 1}, {\"yearmonthdate_timestamp\": \"2012-12-25T00:00:00.000\", \"short_lcc\": \"Social Sciences\", \"sum_visitors\": 2}, {\"yearmonthdate_timestamp\": \"2012-12-26T00:00:00.000\", \"short_lcc\": \"Political Science\", \"sum_visitors\": 2}, {\"yearmonthdate_timestamp\": \"2012-12-26T00:00:00.000\", \"short_lcc\": \"Language And\", \"sum_visitors\": 5}, {\"yearmonthdate_timestamp\": \"2012-12-26T00:00:00.000\", \"short_lcc\": \"Auxiliary Sciences\", \"sum_visitors\": 1}, {\"yearmonthdate_timestamp\": \"2012-12-26T00:00:00.000\", \"short_lcc\": \"General Works\", \"sum_visitors\": 1}, {\"yearmonthdate_timestamp\": \"2012-12-26T00:00:00.000\", \"short_lcc\": \"World History\", \"sum_visitors\": 1}, {\"yearmonthdate_timestamp\": \"2012-12-26T00:00:00.000\", \"short_lcc\": \"Law\", \"sum_visitors\": 1}, {\"yearmonthdate_timestamp\": \"2012-12-26T00:00:00.000\", \"short_lcc\": \"Music And\", \"sum_visitors\": 1}, {\"yearmonthdate_timestamp\": \"2012-12-27T00:00:00.000\", \"short_lcc\": \"Language And\", \"sum_visitors\": 10}, {\"yearmonthdate_timestamp\": \"2012-12-27T00:00:00.000\", \"short_lcc\": \"Bibliography. Library\", \"sum_visitors\": 2}, {\"yearmonthdate_timestamp\": \"2012-12-27T00:00:00.000\", \"short_lcc\": \"Philosophy. Psychology.\", \"sum_visitors\": 1}, {\"yearmonthdate_timestamp\": \"2012-12-27T00:00:00.000\", \"short_lcc\": \"Geography. Anthropology.\", \"sum_visitors\": 1}, {\"yearmonthdate_timestamp\": \"2012-12-27T00:00:00.000\", \"short_lcc\": \"Law\", \"sum_visitors\": 1}, {\"yearmonthdate_timestamp\": \"2012-12-27T00:00:00.000\", \"short_lcc\": \"Political Science\", \"sum_visitors\": 1}, {\"yearmonthdate_timestamp\": \"2012-12-28T00:00:00.000\", \"short_lcc\": \"Language And\", \"sum_visitors\": 7}, {\"yearmonthdate_timestamp\": \"2012-12-28T00:00:00.000\", \"short_lcc\": \"Military Science\", \"sum_visitors\": 1}, {\"yearmonthdate_timestamp\": \"2012-12-28T00:00:00.000\", \"short_lcc\": \"Philosophy. Psychology.\", \"sum_visitors\": 3}, {\"yearmonthdate_timestamp\": \"2012-12-28T00:00:00.000\", \"short_lcc\": \"Science\", \"sum_visitors\": 1}, {\"yearmonthdate_timestamp\": \"2012-12-28T00:00:00.000\", \"short_lcc\": \"Social Sciences\", \"sum_visitors\": 1}, {\"yearmonthdate_timestamp\": \"2012-12-28T00:00:00.000\", \"short_lcc\": \"Music And\", \"sum_visitors\": 1}, {\"yearmonthdate_timestamp\": \"2012-12-29T00:00:00.000\", \"short_lcc\": \"History Of\", \"sum_visitors\": 1}, {\"yearmonthdate_timestamp\": \"2012-12-29T00:00:00.000\", \"short_lcc\": \"World History\", \"sum_visitors\": 1}, {\"yearmonthdate_timestamp\": \"2012-12-29T00:00:00.000\", \"short_lcc\": \"Law\", \"sum_visitors\": 1}, {\"yearmonthdate_timestamp\": \"2012-12-29T00:00:00.000\", \"short_lcc\": \"Philosophy. Psychology.\", \"sum_visitors\": 1}, {\"yearmonthdate_timestamp\": \"2012-12-30T00:00:00.000\", \"short_lcc\": \"History Of\", \"sum_visitors\": 2}, {\"yearmonthdate_timestamp\": \"2012-12-30T00:00:00.000\", \"short_lcc\": \"Language And\", \"sum_visitors\": 10}, {\"yearmonthdate_timestamp\": \"2012-12-30T00:00:00.000\", \"short_lcc\": \"Political Science\", \"sum_visitors\": 2}, {\"yearmonthdate_timestamp\": \"2012-12-30T00:00:00.000\", \"short_lcc\": \"Law\", \"sum_visitors\": 1}, {\"yearmonthdate_timestamp\": \"2012-12-30T00:00:00.000\", \"short_lcc\": \"Social Sciences\", \"sum_visitors\": 3}, {\"yearmonthdate_timestamp\": \"2012-12-30T00:00:00.000\", \"short_lcc\": \"Science\", \"sum_visitors\": 1}, {\"yearmonthdate_timestamp\": \"2012-12-30T00:00:00.000\", \"short_lcc\": \"Fine Arts\", \"sum_visitors\": 1}, {\"yearmonthdate_timestamp\": \"2012-12-30T00:00:00.000\", \"short_lcc\": \"General Works\", \"sum_visitors\": 1}, {\"yearmonthdate_timestamp\": \"2012-12-30T00:00:00.000\", \"short_lcc\": \"World History\", \"sum_visitors\": 1}, {\"yearmonthdate_timestamp\": \"2012-12-31T00:00:00.000\", \"short_lcc\": \"Fine Arts\", \"sum_visitors\": 2}, {\"yearmonthdate_timestamp\": \"2012-12-31T00:00:00.000\", \"short_lcc\": \"Language And\", \"sum_visitors\": 1}, {\"yearmonthdate_timestamp\": \"2012-12-31T00:00:00.000\", \"short_lcc\": \"Social Sciences\", \"sum_visitors\": 2}], \"transform\": [{\"type\": \"formula\", \"expr\": \"toDate(datum['yearmonthdate_timestamp'])\", \"as\": \"yearmonthdate_timestamp\"}]}, {\"name\": \"facet_domain\", \"values\": [{\"short_lcc\": \"Military Science\", \"count\": 27}, {\"short_lcc\": \"History Of\", \"count\": 228}, {\"short_lcc\": \"Social Sciences\", \"count\": 315}, {\"short_lcc\": \"Science\", \"count\": 274}, {\"short_lcc\": \"Medicine\", \"count\": 150}, {\"short_lcc\": \"Language And\", \"count\": 352}, {\"short_lcc\": \"Philosophy. Psychology.\", \"count\": 309}, {\"short_lcc\": \"World History\", \"count\": 276}, {\"short_lcc\": \"Fine Arts\", \"count\": 193}, {\"short_lcc\": \"Education\", \"count\": 170}, {\"short_lcc\": \"Bibliography. Library\", \"count\": 106}, {\"short_lcc\": \"Law\", \"count\": 229}, {\"short_lcc\": \"Music And\", \"count\": 204}, {\"short_lcc\": \"Geography. Anthropology.\", \"count\": 178}, {\"short_lcc\": \"General Works\", \"count\": 102}, {\"short_lcc\": \"Agriculture\", \"count\": 59}, {\"short_lcc\": \"Political Science\", \"count\": 195}, {\"short_lcc\": \"Technology\", \"count\": 193}, {\"short_lcc\": \"Auxiliary Sciences\", \"count\": 59}, {\"short_lcc\": \"Naval Science\", \"count\": 3}]}, {\"name\": \"facet_domain_row\", \"values\": [{\"data\": 0.0}, {\"data\": 1.0}, {\"data\": 2.0}, {\"data\": 3.0}, {\"data\": 4.0}]}, {\"name\": \"facet_domain_column\", \"transform\": [{\"type\": \"sequence\", \"start\": 0.0, \"stop\": {\"signal\": \"min(length(data(\\\"facet_domain\\\")), 4)\"}}]}, {\"name\": \"source_0_y_domain_sum_visitors\", \"values\": [{\"min\": 1, \"max\": 26}]}], \"signals\": [{\"name\": \"child_width\", \"value\": 100}, {\"name\": \"child_height\", \"value\": 80}], \"marks\": [{\"type\": \"group\", \"name\": \"facet-title\", \"title\": {\"text\": \"short_lcc\", \"style\": \"guide-title\", \"offset\": 10}, \"role\": \"column-title\"}, {\"type\": \"group\", \"name\": \"row_header\", \"from\": {\"data\": \"facet_domain_row\"}, \"encode\": {\"update\": {\"height\": {\"signal\": \"child_height\"}}}, \"axes\": [{\"scale\": \"y\", \"tickCount\": {\"signal\": \"ceil(child_height/40)\"}, \"grid\": false, \"title\": \"Sum of visitors\", \"orient\": \"left\", \"labelOverlap\": true, \"zindex\": 0}], \"role\": \"row-header\"}, {\"type\": \"group\", \"name\": \"column_footer\", \"from\": {\"data\": \"facet_domain_column\"}, \"encode\": {\"update\": {\"width\": {\"signal\": \"child_width\"}}}, \"axes\": [{\"scale\": \"x\", \"orient\": \"bottom\", \"labelFlush\": true, \"tickCount\": {\"signal\": \"ceil(child_width/40)\"}, \"grid\": false, \"format\": {\"signal\": \"timeUnitSpecifier([\\\"year\\\",\\\"month\\\",\\\"date\\\"], {\\\"year-month\\\":\\\"%b %Y \\\",\\\"year-month-date\\\":\\\"%b %d, %Y \\\"})\"}, \"title\": \"date\", \"labelOverlap\": true, \"zindex\": 0, \"tickMinStep\": {\"signal\": \"datetime(2001, 0, 2, 0, 0, 0, 0) - datetime(2001, 0, 1, 0, 0, 0, 0)\"}}], \"role\": \"column-footer\"}, {\"type\": \"group\", \"name\": \"cell\", \"from\": {\"facet\": {\"data\": \"source_0\", \"name\": \"facet\", \"groupby\": [\"short_lcc\"]}}, \"sort\": {\"field\": [\"datum[\\\"short_lcc\\\"]\"], \"order\": [\"ascending\"]}, \"encode\": {\"update\": {\"width\": {\"signal\": \"child_width\"}, \"height\": {\"signal\": \"child_height\"}}}, \"marks\": [{\"type\": \"line\", \"name\": \"child_marks\", \"from\": {\"data\": \"facet\"}, \"sort\": {\"field\": \"datum[\\\"yearmonthdate_timestamp\\\"]\"}, \"encode\": {\"update\": {\"description\": {\"signal\": \"\\\"date: \\\" + (timeFormat(datum[\\\"yearmonthdate_timestamp\\\"], timeUnitSpecifier([\\\"year\\\",\\\"month\\\",\\\"date\\\"], {\\\"year-month\\\":\\\"%b %Y \\\",\\\"year-month-date\\\":\\\"%b %d, %Y \\\"}))) + \\\"; Sum of visitors: \\\" + (format(datum[\\\"sum_visitors\\\"], \\\"\\\"))\"}, \"stroke\": {\"value\": \"#4c78a8\"}, \"defined\": {\"signal\": \"isValid(datum[\\\"yearmonthdate_timestamp\\\"]) && isFinite(+datum[\\\"yearmonthdate_timestamp\\\"]) && isValid(datum[\\\"sum_visitors\\\"]) && isFinite(+datum[\\\"sum_visitors\\\"])\"}, \"y\": {\"field\": \"sum_visitors\", \"scale\": \"y\"}, \"x\": {\"field\": \"yearmonthdate_timestamp\", \"scale\": \"x\"}}}, \"style\": [\"line\"]}], \"axes\": [{\"scale\": \"x\", \"tickMinStep\": {\"signal\": \"datetime(2001, 0, 2, 0, 0, 0, 0) - datetime(2001, 0, 1, 0, 0, 0, 0)\"}, \"grid\": true, \"labels\": false, \"minExtent\": 0, \"ticks\": false, \"gridScale\": \"y\", \"orient\": \"bottom\", \"aria\": false, \"tickCount\": {\"signal\": \"ceil(child_width/40)\"}, \"maxExtent\": 0, \"zindex\": 0, \"domain\": false}, {\"scale\": \"y\", \"domain\": false, \"minExtent\": 0, \"orient\": \"left\", \"tickCount\": {\"signal\": \"ceil(child_height/40)\"}, \"ticks\": false, \"zindex\": 0, \"maxExtent\": 0, \"aria\": false, \"labels\": false, \"grid\": true, \"gridScale\": \"x\"}], \"title\": {\"text\": {\"signal\": \"isValid(parent[\\\"short_lcc\\\"]) ? parent[\\\"short_lcc\\\"] : \\\"\\\"+parent[\\\"short_lcc\\\"]\"}, \"offset\": 10, \"style\": \"guide-label\", \"frame\": \"group\"}, \"style\": \"cell\"}], \"scales\": [{\"name\": \"x\", \"type\": \"time\", \"domain\": {\"data\": \"source_0\", \"field\": \"yearmonthdate_timestamp\"}, \"range\": [0, {\"signal\": \"child_width\"}]}, {\"name\": \"y\", \"type\": \"linear\", \"domain\": [{\"signal\": \"(data(\\\"source_0_y_domain_sum_visitors\\\")[0] || {}).min\"}, {\"signal\": \"(data(\\\"source_0_y_domain_sum_visitors\\\")[0] || {}).max\"}], \"range\": [{\"signal\": \"child_height\"}, 0], \"zero\": true, \"nice\": true}], \"background\": \"white\", \"layout\": {\"padding\": 20, \"bounds\": \"full\", \"align\": \"all\", \"columns\": 4}, \"padding\": 5}, {\"mode\": \"vega\"});\n",
       "</script>"
      ],
      "text/plain": [
       "alt.FacetChart(...)"
      ]
     },
     "execution_count": 22,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "col_subset = ['timestamp','visitors','lcc_description']\n",
    "\n",
    "# Get rid of rows with null LCC descriptions\n",
    "pv2 = pageviews.loc[pageviews['lcc_description'].notna(), col_subset]\n",
    "\n",
    "# Split LCC descriptions on a space character, take first two elements and join with space\n",
    "pv2['short_lcc'] = pv2['lcc_description'].str.split().apply(lambda x: x[:2]).str.join(' ')\n",
    "\n",
    "alt.Chart(pv2).mark_line().encode(\n",
    "    x = alt.X('yearmonthdate(timestamp):T', title='date'),\n",
    "    y = 'sum(visitors):Q'\n",
    ").properties(\n",
    "    width=100,\n",
    "    height=80\n",
    ").facet(\n",
    "    facet = 'short_lcc',\n",
    "    columns = 4\n",
    ")"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "---\n",
    "\n",
    "## *EXTRA*\n",
    "\n",
    "### Saving as HTML – file sizes with and without VegaFusion"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 23,
   "metadata": {},
   "outputs": [],
   "source": [
    "temp_bar = alt.Chart(pageviews).mark_bar().encode(\n",
    "    x = 'sum(visitors)',\n",
    "    y = 'country'\n",
    ")"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### File size = 2.2 Mb"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 24,
   "metadata": {},
   "outputs": [],
   "source": [
    "temp_bar.save('temp_bar.html')"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### View the data really fed into the visualization with VegaFusion"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 25,
   "metadata": {},
   "outputs": [
    {
     "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>country</th>\n",
       "      <th>sum_visitors</th>\n",
       "    </tr>\n",
       "  </thead>\n",
       "  <tbody>\n",
       "    <tr>\n",
       "      <th>0</th>\n",
       "      <td>Canada</td>\n",
       "      <td>2718</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>1</th>\n",
       "      <td>United States</td>\n",
       "      <td>5241</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>2</th>\n",
       "      <td>United Kingdom</td>\n",
       "      <td>2428</td>\n",
       "    </tr>\n",
       "  </tbody>\n",
       "</table>\n",
       "</div>"
      ],
      "text/plain": [
       "          country  sum_visitors\n",
       "0          Canada          2718\n",
       "1   United States          5241\n",
       "2  United Kingdom          2428"
      ]
     },
     "execution_count": 25,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "vf.transformed_data(temp_bar)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### File size = 4 kb"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 26,
   "metadata": {},
   "outputs": [],
   "source": [
    "vf.save_html(temp_bar, 'temp_bar_vf.html')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
 ],
 "metadata": {
  "kernelspec": {
   "display_name": "Python 3 (ipykernel)",
   "language": "python",
   "name": "python3"
  },
  "language_info": {
   "codemirror_mode": {
    "name": "ipython",
    "version": 3
   },
   "file_extension": ".py",
   "mimetype": "text/x-python",
   "name": "python",
   "nbconvert_exporter": "python",
   "pygments_lexer": "ipython3",
   "version": "3.9.12"
  }
 },
 "nbformat": 4,
 "nbformat_minor": 4
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