回答此问题可获得 20 贡献值,回答如果被采纳可获得 50 分。
<P>考虑下面的数据文件:</P>
<pre><code>df_test = pd.DataFrame(
[
['TAVG',51,'2020-01-01'],
['TMAX',59,'2020-01-01'],
['TMIN',46,'2020-01-01'],
['TAVG',53,'2020-01-02'],
['TMAX',61,'2020-01-02'],
['TMIN',45,'2020-01-02'],
['TAVG',50,'2020-01-03'],
['TMAX',60,'2020-01-03'],
['TMIN',40,'2020-01-03']
],
columns = ['datatype', 'value', 'date']
)
</code></pre>
<p><a href="https://i.stack.imgur.com/8d2jj.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/8d2jj.png" alt="enter image description here"/></a></p>
<p>我希望将每个日期的值组合在一行中,如下所示:</p>
<p><a href="https://i.stack.imgur.com/929P3.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/929P3.png" alt="enter image description here"/></a></p>
<p>我使用<code>loc</code>进行了各种尝试,但都失败了</p>