Creates a list with the unique values filtered out.

from collections import Counter

def filter_unique(lst):
 return [item for item, count in Counter(lst).items() if count > 1]

filter_unique([1, 2, 2, 3, 4, 4, 5]) # [2, 4]

Creates a list with the unique values filtered out.
<ul>
<li>Use <code class="notranslate">collections.Counter</code> to get the count of each value in the list.</li>
<li>Use a list comprehension to create a list containing only the non-unique values.</li>
</ul>

Filter unique list values

More like this

Filter non-unique list values

Value frequencies

Bifurcate list based on function