import numpy as np
import matplotlib.pyplot as plt
with open("data1.txt","r",encoding="utf-8") as f :
    lu = f.readlines()
data,nb_com = [],0
for ligne in lu :
    try  :
        data.append([ float(m) for m \
                      in ligne.split()])
    except :
       nb_com += 1
print(nb_com,"ligne(s) de commentaires")
tab = np.array(data)
print("Tableau lu de taille",tab.shape)
plt.plot(tab[:,2],tab[:,1],"om")
plt.show()