https://www.tutorialspoint.com/execute_matplotlib_online.php

aff.py

listx=[]
listfx=[]
 
#xmin=-4
#xmax=4
xmin=min(px)-1
xmax=max(px)+1
 
 
# https://matplotlib.org/stable/api/_as_gen/matplotlib.pyplot.html
#https://matplotlib.org/3.4.3/gallery/subplots_axes_and_figures/subplot.html#sphx-glr-gallery-subplots-axes-and-figures-subplot-py
# j'aurai pu faire avec un np.linspace
for i in range(int(xmin*100),int(xmax*100),1):
            x=i/100.0
            #fx=f(x,a,b,c)
            fx=a*x+b            
            listx.append(x)
            listfx.append(fx)
 
plt.plot(listx, listfx,'g-')
 
plt.show()