擅长:python、mysql、java
<h2>使用索引返回pandas数据帧的一部分</h2>
<p>一些数据:</p>
<pre><code>date_time = ["2011-09-01", "2011-08-01", "2011-07-01", "2011-06-01", "2011-05-01"]
date_time = pd.to_datetime(date_time)
temp = [2, 4, 6, 4, 6]
DF = pd.DataFrame()
DF['temp'] = temp
DF = DF.set_index(date_time)
DF[:2] # rows to view
</code></pre>
<p>返回DF的前两项:</p>
^{pr2}$