擅长:python、mysql、java
<p>对于<code>reindex</code>,需要从<code>sample</code>列创建索引:</p>
<pre><code>df=df.set_index(['sample']).reindex(["CO ref","CO tus","CO raai"]).reset_index()
</code></pre>
<p>或使用有序分类:</p>
<pre><code>cats = ["CO ref","CO tus","CO raai"]
df['sample'] = pd.CategoricalIndex(df['sample'], ordered=True, categories=cats)
df = df.sort_values('sample')
</code></pre>