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leetcode-cn/problem (Chinese)/数据重塑：透视 [reshape-data-pivot].html Normal file
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<pre>
DataFrame <code>weather</code>
+-------------+--------+
| Column Name | Type |
+-------------+--------+
| city | object |
| month | object |
| temperature | int |
+-------------+--------+
</pre>
<p>编写一个解决方案，以便将数据&nbsp;<strong>旋转</strong>，使得每一行代表特定月份的温度，而每个城市都是一个单独的列。</p>
<p>输出结果格式如下示例所示。</p>
<p>&nbsp;</p>
<b>示例 1:</b>
<pre>
<b>输入：</b>
+--------------+----------+-------------+
| city | month | temperature |
+--------------+----------+-------------+
| Jacksonville | January | 13 |
| Jacksonville | February | 23 |
| Jacksonville | March | 38 |
| Jacksonville | April | 5 |
| Jacksonville | May | 34 |
| ElPaso | January | 20 |
| ElPaso | February | 6 |
| ElPaso | March | 26 |
| ElPaso | April | 2 |
| ElPaso | May | 43 |
+--------------+----------+-------------+
<code><b>输出：</b>
+----------+--------+--------------+
| month | ElPaso | Jacksonville |
+----------+--------+--------------+
| April | 2 | 5 |
| February | 6 | 23 |
| January | 20 | 13 |
| March | 26 | 38 |
| May | 43 | 34 |
+----------+--------+--------------+</code>
<strong>解释：
</strong>表格被旋转，每一列代表一个城市，每一行代表特定的月份。</pre>