擅长:python、mysql、java
<h3>设置</h3>
<pre><code>import pandas as pd
idx = pd.Index(['B0006IYIMW', 'B000A56PUO', 'B000AMLQQU', 'B000OVNMGE'],
name='item-id')
df1 = pd.DataFrame([5., 3., 4., 1.],
columns=['rating'], index=idx)
df2 = pd.DataFrame(['iphone', 'samsung', 'htc', 'nokia'],
columns=['class'], index=idx)
</code></pre>
<h3>解决方案</h3>
^{pr2}$
<h3>演示</h3>
<pre><code>print df
class rating
item-id
B0006IYIMW iphone 5.0
B000A56PUO samsung 3.0
B000AMLQQU htc 4.0
B000OVNMGE nokia 1.0
</code></pre>