擅长:python、mysql、java
<p>使用<code>duplicated</code></p>
<pre><code>test[~test.price.duplicated(keep=False)]
price
3 3
4 5
</code></pre>
<hr/>
<pre><code>test.index[~test.price.duplicated(keep=False)]
Int64Index([3, 4], dtype='int64')
</code></pre>
<p>更新然后你需要<code>transform</code></p>
<pre><code>test[test.groupby('price').price.transform('count')<=1]
price
3 3
4 5
test[test.groupby('price').price.transform('count')<3].index
Int64Index([0, 2, 3, 4], dtype='int64')
</code></pre>