擅长:python、mysql、java
<p>{{cd2>需要使用<cd2},因为</p>
<pre><code>df = df.assign(Latency=lambda d: (d.CloseTimeStamp - d.CreationTimeStamp).dt.total_seconds() * 1000.)
</code></pre>
<p>无λ溶液:</p>
^{pr2}$
<p>…和不含<code>assign</code>的溶液:</p>
<pre><code>df['Latency'] = (df.CloseTimeStamp - df.CreationTimeStamp).dt.total_seconds() * 1000.
</code></pre>