import os
os.chdir(r'D:\Documents(D)\Bellevue\0-PSI\1-Cycle 1 Chaine Multiphysique\3 TP OK\TP2')

f=open('essai-20.txt')
tab=f.readlines()

t=[]
m1=[]
m2=[]
for i in range(36,len(tab)-4):
    l=tab[i].split("\\'b3")
    t.append(float(l[2]))
    m1.append(float(l[3]))
    m2.append(float(l[4]))
    
import matplotlib.pyplot as pl
pl.plot(t,m1,'r',label='consigne')
pl.plot(t,m2,'b',label='réponse')
pl.legend()
pl.show()