Duplicate information

[snippsat]

Something like this.

import pandas as pd
from io import StringIO

data = StringIO("""\
_c0,_c4
0,b
0,g
0,f
1,a
1,f
1,c
2,f
2,e
2,a
2,c
""")

df = pd.read_csv(data, sep=",")

>>> df = df.groupby('_c0')
>>> grouped_list = df["_c4"].apply(list)
>>> grouped_list
_c0
0       [b, g, f]
1       [a, f, c]
2    [f, e, a, c]
Name: _c4, dtype: object
>>> 
>>> df = grouped_list.reset_index()
>>> df
   _c0           _c4
0    0     [b, g, f]
1    1     [a, f, c]
2    2  [f, e, a, c]