How to keep last entry from duplicate entries

[perfringo]

One way to keep last row from filtered rows is to use .tail(n=1):

>>> import pandas as pd
>>> df = pd.DataFrame([1, 2, 1, 2, 3, 3])                                                                              
>>> df                                                                                                                 
   0
0  1
1  2
2  1
3  2
4  3
5  3
>>> df.loc[df[0] == 2].tail(n=1)                                                                                       
   0
3  2