import numpy as np
def lecture(name):
    lst_date = []
    lst_conso = []
    lst_t_moy = []
    lst_t_ref = []
    with open(name) as fic:
        fic.readline()
        for ligne in fic: 
            date,conso, t_moy, t_ref = ligne.split(';')
            lst_date.append(date)
            lst_conso.append(float(conso))
            lst_t_moy.append(float(t_moy))
            lst_t_ref.append(float(t_ref))
    return(np.array(lst_date), np.array(lst_conso), np.array(lst_t_moy), np.array(lst_t_ref))
            
def