擅长:python、mysql、java
<pre><code>In [28]: df_picru['new'] = \
df_picru['REF_INT'].duplicated(keep=False) \
.map({True:'duplicates',False:'unique'})
In [29]: df_picru
Out[29]:
REF_INT new
0 1 unique
1 2 duplicates
2 3 unique
3 8 duplicates
4 8 duplicates
5 2 duplicates
</code></pre>