擅长:python、mysql、java
<p>带有索引联合的一个:</p>
<pre><code>df = pd.DataFrame(columns=range(16)).add_prefix('col')
mid = len(df.columns)//2
idx = df.columns[:mid].union(df.columns[[-1]]
.union(df.columns[mid:-1],sort=False),sort=False)
out = df[idx]
</code></pre>
<hr/>
<pre><code>Empty DataFrame
Columns: [col0, col1, col2, col3, col4, col5, col6, col7,
col15, col8, col9, col10, col11, col12, col13, col14]
Index: []
</code></pre>