from tkinter import *
import random
fenetre = Tk()

def dessiner_carre():
    couleurs = ["red", "green", "blue", "yellow", "gray"]
    couleur_utiliser = random.choice(couleurs)
    taille = random.randint(10,30)
    x = random.randint(0, 400 - taille)
    y = random.randint(0, 300 - taille)
    canvas.create_rectangle(x, y, x + taille, y + taille, fill=couleur_utiliser )

# canvas
canvas = Canvas(fenetre, width=400, height=300, background='black')
canvas.pack()

bouton=Button(fenetre, text="Dessine", command=dessiner_carre)
bouton.pack()
# bouton de sortie
bouton=Button(fenetre, text="Fermer", command=fenetre.quit)
bouton.pack()

fenetre.mainloop()
fenetre.destroy()