Reindexing

pd_reindex.ipynb

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   "source": [
    "import pandas as pd"
   ]
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       "  <thead>\n",
       "    <tr style=\"text-align: right;\">\n",
       "      <th></th>\n",
       "      <th>battle_deaths</th>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>date</th>\n",
       "      <th></th>\n",
       "    </tr>\n",
       "  </thead>\n",
       "  <tbody>\n",
       "    <tr>\n",
       "      <th>2014-05-01</th>\n",
       "      <td>34</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>2014-05-02</th>\n",
       "      <td>25</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>2014-05-05</th>\n",
       "      <td>26</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>2014-05-07</th>\n",
       "      <td>15</td>\n",
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      "text/plain": [
       "            battle_deaths\n",
       "date                     \n",
       "2014-05-01             34\n",
       "2014-05-02             25\n",
       "2014-05-05             26\n",
       "2014-05-07             15"
      ]
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     "execution_count": 81,
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   "source": [
    "data = {'date': ['2014-05-01', '2014-05-02', '2014-05-05', '2014-05-07'], \n",
    "        'battle_deaths': [34, 25, 26, 15]}\n",
    "\n",
    "df = pd.DataFrame(data, columns = ['date', 'battle_deaths'])\n",
    "df['date'] = pd.to_datetime(df['date'])\n",
    "df.set_index('date', inplace=True)\n",
    "df['May 2014']"
   ]
  },
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   "execution_count": 90,
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       "  <thead>\n",
       "    <tr style=\"text-align: right;\">\n",
       "      <th></th>\n",
       "      <th>battle_deaths</th>\n",
       "    </tr>\n",
       "  </thead>\n",
       "  <tbody>\n",
       "    <tr>\n",
       "      <th>2014-05-01</th>\n",
       "      <td>34</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>2014-05-02</th>\n",
       "      <td>25</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>2014-05-03</th>\n",
       "      <td>25</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>2014-05-04</th>\n",
       "      <td>25</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>2014-05-05</th>\n",
       "      <td>26</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>2014-05-06</th>\n",
       "      <td>26</td>\n",
       "    </tr>\n",
       "    <tr>\n",
       "      <th>2014-05-07</th>\n",
       "      <td>15</td>\n",
       "    </tr>\n",
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      "text/plain": [
       "            battle_deaths\n",
       "2014-05-01             34\n",
       "2014-05-02             25\n",
       "2014-05-03             25\n",
       "2014-05-04             25\n",
       "2014-05-05             26\n",
       "2014-05-06             26\n",
       "2014-05-07             15"
      ]
     },
     "execution_count": 90,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "time_range = pd.date_range('2014-05-01', '2014-05-07') #will return datetime series object\n",
    "df_reindexed = df.reindex(time_range, method='ffill') #ffill is forward fill\n",
    "df_reindexed"
   ]
  }
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