擅长:python、mysql、java
<p>空列表<code>[]</code>计算为<code>False</code></p>
<pre><code>df[df.Phrase.astype(bool)]
Phrase Sentiment
0 [good, movie] positive
1 [woow, is, it, very, good] positive
</code></pre>
<hr/>
<p><strong><em>设置</em></strong></p>
<pre><code>df = pd.DataFrame([
[['good', 'movie'], 'positive'],
[['woow', 'is', 'it', 'very', 'good'], 'positive'],
[[], 'negative'],
[[], 'pOSITIVE']
], columns=['Phrase', 'Sentiment'])
</code></pre>