Analyze Organization Hierarchy.ipynb

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   "source": [
    "import pandas as pd\n",
    "\n",
    "data = [[1, 'Alice', None, 12000, 'Executive'],\n",
    "        [2, 'Bob', 1, 10000, 'Sales'],\n",
    "        [3, 'Charlie', 1, 10000, 'Engineering'],\n",
    "        [4, 'David', 2, 7500, 'Sales'],\n",
    "        [5, 'Eva', 2, 7500, 'Sales'],\n",
    "        [6, 'Frank', 3, 9000, 'Engineering'],\n",
    "        [7, 'Grace', 3, 8500, 'Engineering'],\n",
    "        [8, 'Hank', 4, 6000, 'Sales'],\n",
    "        [9, 'Ivy', 6, 7000, 'Engineering'],\n",
    "        [10, 'Judy', 6, 7000, 'Engineering']]\n",
    "employees = pd.DataFrame(data, columns=[\"employee_id\", \"employee_name\", \"manager_id\",\n",
    "                                        \"salary\", \"department\"]).astype({\"employee_id\": \"int\",\n",
    "                                        \"employee_name\": \"string\", \"manager_id\": \"Int64\",\n",
    "                                        \"salary\": \"int\", \"department\": \"string\"})\n",
    "display(employees)\n"
   ],
   "outputs": [
    {
     "data": {
      "text/plain": [
       "   employee_id employee_name  manager_id  salary   department\n",
       "0            1         Alice        <NA>   12000    Executive\n",
       "1            2           Bob           1   10000        Sales\n",
       "2            3       Charlie           1   10000  Engineering\n",
       "3            4         David           2    7500        Sales\n",
       "4            5           Eva           2    7500        Sales\n",
       "5            6         Frank           3    9000  Engineering\n",
       "6            7         Grace           3    8500  Engineering\n",
       "7            8          Hank           4    6000        Sales\n",
       "8            9           Ivy           6    7000  Engineering\n",
       "9           10          Judy           6    7000  Engineering"
      ],
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       "<table border=\"1\" class=\"dataframe\">\n",
       "  <thead>\n",
       "    <tr style=\"text-align: right;\">\n",
       "      <th></th>\n",
       "      <th>employee_id</th>\n",
       "      <th>employee_name</th>\n",
       "      <th>manager_id</th>\n",
       "      <th>salary</th>\n",
       "      <th>department</th>\n",
       "    </tr>\n",
       "  </thead>\n",
       "  <tbody>\n",
       "    <tr>\n",
       "      <th>0</th>\n",
       "      <td>1</td>\n",
       "      <td>Alice</td>\n",
       "      <td>&lt;NA&gt;</td>\n",
       "      <td>12000</td>\n",
       "      <td>Executive</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>1</th>\n",
       "      <td>2</td>\n",
       "      <td>Bob</td>\n",
       "      <td>1</td>\n",
       "      <td>10000</td>\n",
       "      <td>Sales</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>2</th>\n",
       "      <td>3</td>\n",
       "      <td>Charlie</td>\n",
       "      <td>1</td>\n",
       "      <td>10000</td>\n",
       "      <td>Engineering</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>3</th>\n",
       "      <td>4</td>\n",
       "      <td>David</td>\n",
       "      <td>2</td>\n",
       "      <td>7500</td>\n",
       "      <td>Sales</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>4</th>\n",
       "      <td>5</td>\n",
       "      <td>Eva</td>\n",
       "      <td>2</td>\n",
       "      <td>7500</td>\n",
       "      <td>Sales</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>5</th>\n",
       "      <td>6</td>\n",
       "      <td>Frank</td>\n",
       "      <td>3</td>\n",
       "      <td>9000</td>\n",
       "      <td>Engineering</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>6</th>\n",
       "      <td>7</td>\n",
       "      <td>Grace</td>\n",
       "      <td>3</td>\n",
       "      <td>8500</td>\n",
       "      <td>Engineering</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>7</th>\n",
       "      <td>8</td>\n",
       "      <td>Hank</td>\n",
       "      <td>4</td>\n",
       "      <td>6000</td>\n",
       "      <td>Sales</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>8</th>\n",
       "      <td>9</td>\n",
       "      <td>Ivy</td>\n",
       "      <td>6</td>\n",
       "      <td>7000</td>\n",
       "      <td>Engineering</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>9</th>\n",
       "      <td>10</td>\n",
       "      <td>Judy</td>\n",
       "      <td>6</td>\n",
       "      <td>7000</td>\n",
       "      <td>Engineering</td>\n",
       "    </tr>\n",
       "  </tbody>\n",
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