擅长:python、mysql、java
<p>也可以先将行移动一行:</p>
<pre><code>df["ENTRIESn_hourly"] = df["ENTRIESn"] - df["ENTRIESn"].shift()
</code></pre>
<p>见<a href="http://pandas.pydata.org/pandas-docs/version/0.15.1/generated/pandas.DataFrame.shift.html" rel="nofollow">pandas.DataFrame.shift</a>。你知道吗</p>