>>> import pandas as pd
>>> from electra import electra2

>>> df = pd.read_csv('consum_elect.csv', dtype = {'Codi_Postal': str})

--ini-electra2
>>> electra2(df, 'Residencial')
('18-24', 93480291)
>>> electra2(df, 'Indústria')
('12-18', 11816140)

--fi-electra2
>>> electra2(df, 'Serveis')
('12-18', 127982533)
>>> electra2(df, 'No especificat')
('12-18', 227305)

>>> df1 = df[:1000]
>>> electra2(df1, 'Residencial')
('18-24', 3453868)
>>> electra2(df1, 'Indústria')
('12-18', 408342)
>>> electra2(df1, 'Serveis')
('12-18', 4489494)
>>> electra2(df1, 'No especificat')
('12-18', 6449)

>>> df2 = df[5000:10000]
>>> electra2(df2, 'Residencial')
('18-24', 21329238)
>>> electra2(df2, 'Indústria')
('6-12', 2549465)
>>> electra2(df2, 'Serveis')
('12-18', 27409333)
>>> electra2(df2, 'No especificat')
('12-18', 46564)