擅长:python、mysql、java
<p>Pandas DataFrame <code>set_index</code>方法需要<code>inplace</code>参数将其就地分配,因此:</p>
<pre><code>palma.Created_at = pd.to_datetime(palma.Created_at).dt.date
palma.set_index('Created_at', inplace=True)
palma = palma[palma.index != '2018-09-21']
</code></pre>
<p>它重新定义了<code>palma</code>,排除了索引为<code>'2018-09-21'</code>的每一行</p>