import numpy as np
import pandas as pd
BASE_GERAL = pd.read_csv('base_prestadores.csv')
indice | data_utilização| preço | quantidade_itens
1 | 2014-05-01 | 20.00 | 5
2 | 2014-05-08 | 30.00 | 6
3 | 2014-04-10 | 50.00 | 8
4 | 2014-04-15 | 20.00 | 10
I imported the above table and need to group the data by month / year, considering the sum of the number of items how can I do this?