How to filter data in python

Question

I have a data set like d1.

import pandas as pd
d1 = {
\'customers\': pd.Series([1, 1, 1, 2, 2, 3, 3, 4, 4]),
\'channel\': pd.Series([\'a\', \'a\', \         


        

Answer 1

Is this what you want ?

d1[d1.customers.isin(d1[(d1.freq==2) & (d1.channel=="a")].customers)]

  channel  customers  freq
3       c          2     2
4       a          2     2
5       a          3     2
6       b          3     2

HTH