Concat and merge

concat.ipynb

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   "id": "thirty-freeze",
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     "data": {
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       "<table border=\"1\" class=\"dataframe\">\n",
       "  <thead>\n",
       "    <tr style=\"text-align: right;\">\n",
       "      <th></th>\n",
       "      <th>ID</th>\n",
       "      <th>date</th>\n",
       "      <th>EVM</th>\n",
       "    </tr>\n",
       "  </thead>\n",
       "  <tbody>\n",
       "    <tr>\n",
       "      <th>0</th>\n",
       "      <td>A</td>\n",
       "      <td>2021-04-25</td>\n",
       "      <td>4</td>\n",
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       "    <tr>\n",
       "      <th>1</th>\n",
       "      <td>A</td>\n",
       "      <td>2021-04-25</td>\n",
       "      <td>5</td>\n",
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       "      <th>2</th>\n",
       "      <td>A</td>\n",
       "      <td>2021-04-25</td>\n",
       "      <td>6</td>\n",
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       "      <th>3</th>\n",
       "      <td>A</td>\n",
       "      <td>2021-04-26</td>\n",
       "      <td>4</td>\n",
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       "      <th>4</th>\n",
       "      <td>A</td>\n",
       "      <td>2021-04-26</td>\n",
       "      <td>5</td>\n",
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       "      <th>5</th>\n",
       "      <td>A</td>\n",
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       "      <td>6</td>\n",
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       "    <tr>\n",
       "      <th>6</th>\n",
       "      <td>B</td>\n",
       "      <td>2021-04-25</td>\n",
       "      <td>4</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>7</th>\n",
       "      <td>B</td>\n",
       "      <td>2021-04-25</td>\n",
       "      <td>5</td>\n",
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       "    <tr>\n",
       "      <th>8</th>\n",
       "      <td>B</td>\n",
       "      <td>2021-04-25</td>\n",
       "      <td>6</td>\n",
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      ],
      "text/plain": [
       "  ID        date  EVM\n",
       "0  A  2021-04-25    4\n",
       "1  A  2021-04-25    5\n",
       "2  A  2021-04-25    6\n",
       "3  A  2021-04-26    4\n",
       "4  A  2021-04-26    5\n",
       "5  A  2021-04-26    6\n",
       "6  B  2021-04-25    4\n",
       "7  B  2021-04-25    5\n",
       "8  B  2021-04-25    6"
      ]
     },
     "execution_count": 1,
     "metadata": {},
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   ],
   "source": [
    "import pandas as pd\n",
    "df = pd.DataFrame({\"ID\":[\"A\",\"A\",\"A\",\"A\",\"A\",\"A\",\"B\",\"B\",\"B\"],\n",
    "                   \"date\":[\"2021-04-25\",\"2021-04-25\",\"2021-04-25\",\n",
    "                           \"2021-04-26\",\"2021-04-26\",\"2021-04-26\",\n",
    "                           \"2021-04-25\",\"2021-04-25\",\"2021-04-25\"],\n",
    "                   \"EVM\":[4,5,6,4,5,6,4,5,6]})\n",
    "df"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "id": "martial-display",
   "metadata": {},
   "outputs": [],
   "source": [
    "df[\"EVM name\"] = [\"E\",\"V\",\"M\"]*int(len(df)/3)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "id": "pleased-bristol",
   "metadata": {},
   "outputs": [
    {
     "data": {
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       "  <thead>\n",
       "    <tr>\n",
       "      <th></th>\n",
       "      <th></th>\n",
       "      <th colspan=\"3\" halign=\"left\">EVM</th>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th></th>\n",
       "      <th>EVM name</th>\n",
       "      <th>E</th>\n",
       "      <th>M</th>\n",
       "      <th>V</th>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>ID</th>\n",
       "      <th>date</th>\n",
       "      <th></th>\n",
       "      <th></th>\n",
       "      <th></th>\n",
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       "  </thead>\n",
       "  <tbody>\n",
       "    <tr>\n",
       "      <th rowspan=\"2\" valign=\"top\">A</th>\n",
       "      <th>2021-04-25</th>\n",
       "      <td>4</td>\n",
       "      <td>6</td>\n",
       "      <td>5</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>2021-04-26</th>\n",
       "      <td>4</td>\n",
       "      <td>6</td>\n",
       "      <td>5</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>B</th>\n",
       "      <th>2021-04-25</th>\n",
       "      <td>4</td>\n",
       "      <td>6</td>\n",
       "      <td>5</td>\n",
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      ],
      "text/plain": [
       "              EVM      \n",
       "EVM name        E  M  V\n",
       "ID date                \n",
       "A  2021-04-25   4  6  5\n",
       "   2021-04-26   4  6  5\n",
       "B  2021-04-25   4  6  5"
      ]
     },
     "execution_count": 3,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "df.set_index([\"ID\", \"date\", \"EVM name\"]).unstack()"
   ]
  }
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