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import io
import pandas as pd
s = '''
Nome,Dia
Pedro,3
Pedro,3
Pedro,24
Antonio,24
Antonio,24
Antonio,24
Carlos,4
Carlos,4
Carlos,28
Jose,1
Jose,2
Jose,2
'''
df = pd.read_csv(io.StringIO(s), parse_dates=True)
df = df.drop_duplicates(subset = ['Nome','Dia'])
grouped = df.groupby(['Nome', 'Dia']).sum()
print(grouped, '\n')
lst = df.groupby(by=['Nome'])['Dia'].apply(list)
print('Solução com pandas.core.series.Series ')
for i in lst.items():
print(i)