擅长:python、mysql、java
<p>当<code>lambda</code>创建了多个段落时,<code>lambda</code>函数将出现重复名称错误的问题</p>
<pre><code>fuc1=lambda x: x.tail(5).mean()
fuc1.__name__ = 'tail_mean'
fuc2=lambda x: x.iloc[0:int(len(df)/5)].mean()
fuc2.__name__ = 'len_mean'
features = df.groupby('process_id').agg(['min', 'max', 'mean', 'std', fuc1,fuc2])
</code></pre>