擅长:python、mysql、java
<p>使用<code>join</code></p>
<pre><code>oss.join(p1.set_index(['StreamId', 'SeqNum']), on=['Stream', 'SeqNo'])
OrderID Symbol Stream SeqNo Timestamp
0 5000000 AXBANK 3 1158 1.490250e+18
1 5000001 AXBANK 6 1733 NaN
2 5000002 AXBANK 6 1244 NaN
3 5000003 AXBANK 6 1388 NaN
4 5000004 AXBANK 3 1389 1.490250e+18
</code></pre>