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Quelle est la valeur de res['A'] après l'exécution de ce code ?
import pandas as pd
import numpy as np
df = pd.DataFrame({'id': ['A', 'A', 'B'], 'val': [10.0, np.nan, 5.0]})
# Opération de groupement
res = df.groupby('id')['val'].sum()
Author: WeLoveDevsStatus: Waiting for validationQuestion not yet passed
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