all_moy=[]
all_std=[]
all_number=[]
for index, row in df.iterrows():
    print(row.freq)
    moy=np.mean(row.freq)
    std=np.std(row.freq)
    number=row.voc.split('_')[-1]
    
    all_moy.append(moy)
    all_std.append(std)
    all_number.append(number)
    #print(row.freq)
df["moyenne"]=all_moy
df["number"]=all_number
df["std_"]=all_std