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Hi

"[Errno 1] Operation not permitted : for the first line above " import matplotlib.pyplot as plt" Why ?

import matplotlib.pyplot as plt
#Les fonctions------------------------------------------------------
def calcul_vitesses(abscisses,ordonnees,temps):
    v_x=[]
    v_y=[]
    for n in range(len(abscisses)-1):
        v_x.append((abscisses[n+1]-abscisses[n])/(temps[n+1]-temps[n]))
        v_y.append((ordonnees[n+1]-ordonnees[n])/(temps[n+1]-temps[n]))
    temps=temps[:-1]
    return v_x,v_y,temps
def representation_graphique(abscisses,ordonnees,v_x,v_y):
    plt.figure(figsize=(10,3))
    plt.subplots_adjust(left=0.06, bottom=0.16, right=0.99, top=0.92,
                wspace=0.2, hspace=None)
    #------------------------------
    plt.subplot(1,3,1)
    plt.scatter(abscisses,ordonnees,marker='+')
    plt.title('Vecteur vitesse instantannée')
    plt.xlabel('x en (m)')
    plt.ylabel('Altitude z en (m)')
    plt.xlim(0.8*min(abscisses),1.2*max(abscisses))
    for i in range(0,len(v_x),1):
        V=plt.quiver(abscisses[i], ordonnees[i] ,v_x[i] , v_y[i],
         scale_units='xy',angles='xy', scale=12)
        plt.quiverkey(V,0.8,0.8,500,label='v')
    #------------------------------
    plt.subplot(1,3,2)
    plt.scatter(abscisses,ordonnees,marker='+')
    plt.title('Variation du vecteur vitesse')
    plt.xlabel('x en (m)')
    plt.ylabel('Altitude z en (m)')
    plt.xlim(0.8*min(abscisses),1.2*max(abscisses))
    for i in range(1,len(v_x),1):
        DV=plt.quiver(abscisses[i],ordonnees[i],v_x[i]-v_x[i-1],v_y[i]-v_y[i-1],
        scale_units='xy',angles='xy', scale=2, color='red')
        plt.quiverkey(DV,0.8,0.8,100,label='V(n)-V(n-1)', labelcolor='red')
    #-------------------------------
    plt.subplot(1,3,3)
    plt.scatter(abscisses,ordonnees,marker='+')
    plt.title('Somme des forces extérieures')
    plt.xlabel('x en (m)')
    plt.ylabel('Altitude z en (m)')
    plt.xlim(0.8*min(abscisses),1.2*max(abscisses))
    for i in range(1,len(v_x),1):
        F=plt.quiver(abscisses[i],ordonnees[i],0,-0.06*9.8,
        scale_units='xy',angles='xy', scale=1, color='g')
        plt.quiverkey(F,0.8,0.8,50,label='F', labelcolor='g')
    #-------------------------------
    plt.show()
#Le programme principal--------------------------------------------
x=[0.00,0.50,1.00,1.50,2.00,2.50,3.00,3.50,4.00,4.50,5.00]
z=[5.00,4.95,4.80,4.56,4.22,3.77,3.23,2.60,1.86,1.03,0.09]
t=[0.00,0.10,0.20,0.30,0.40,0.50,0.60,0.70,0.80,0.90,1.00]
v_x,v_y,temps_v=calcul_vitesses(x,z,t)
representation_graphique(x,z,v_x,v_y)

Are you running a script from an iCloud drive or the local files?

from cloud file

And when i Write a new code:

import matplotlib.pyplot as plt
x=[1,2]
y=[1,2]
plt.scatter(x,y)
plt.show()

i've got an error message for the first line

import matplotlib.pyplot as plt

"module 'matplotlib' has no attribute 'cbook'"

WHAT THE ...... !!??

Check if you don’t have 2 packages of matplotlib installed by coincidence.

There are known problems with running scripts from iCloud.

For me, this little script works also if in Pythonista iCloud

import matplotlib.pyplot as plt
x=[1,2]
y=[1,2]
plt.scatter(x,y)
plt.show()

And the big script also works....

Same error and solution here and here

Found via Google on module 'matplotlib' has no attribute 'cbook'