擅长:python、mysql、java
<p>您可以从<code>year</code>和<code>month</code>构造一个<code>MultiIndex</code>对象,并将其分配给数据帧的索引:</p>
<pre><code>import pandas as pd
d.index = pd.MultiIndex.from_arrays([d.index.year, d.index.month])
d.index
# MultiIndex(levels=[[1970, 1971], [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]],
# labels=[[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1], [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11]])
d.head()
# 0
#1970 1 0.657130
# 2 0.047241
# 3 0.984799
# 4 0.868508
# 5 0.678536
</code></pre>