擅长:python、mysql、java
<p>如果要创建具有值的项目目录以供以后使用,可以执行以下操作:</p>
<pre><code>maps = df.dropna().set_index('detail').to_dict()['category']
df['category'] = df.set_index('detail').index.map(maps)
</code></pre>
<p>地图</p>
<pre><code>{'apple mac': 'computer',
'apple iphone x': 'phone',
'samsumg galaxy s10': 'phone'}
</code></pre>
<p>输出:</p>
<pre><code> detail category
0 apple mac computer
1 apple iphone x phone
2 samsumg galaxy s10 phone
3 samsumg galaxy s10 phone
4 hp computer NaN
</code></pre>