擅长:python、mysql、java
<p>如果要查找具有多个匹配项的所有唯一值,一种方法是使用带有可选<code>return_counts=True</code>参数的<a href="https://numpy.org/doc/stable/reference/generated/numpy.unique.html" rel="nofollow noreferrer">^{<cd1>}</a>。结果元组<code>(unique, counts)</code>可以组合使用,以查找计数超过1的所有唯一值:</p>
<pre class="lang-py prettyprint-override"><code>In [3]: # mash keys to get a series with repeated values
...: s = pd.Series(list('abcoiansfaionawiaonwncawowc'))
In [4]: # get unique values and counts
...: u, c = np.unique(s, return_counts=True)
In [5]: # find all unique keys with occurrence counts > 1
...: u[c > 1]
Out[5]: array(['a', 'c', 'i', 'n', 'o', 'w'], dtype=object)
</code></pre>