Button in one class, methods in another one

[metulburr]

That is not the best way to interact classes with each other. The best solution would be to make the Face object in the canvas class like this:

from tkinter import *
 
class Button_Can(Frame):
    def __init__(self):
        Frame.__init__(self)
        self.larg,self.haut=200,200
        self.can=Canvas(self.master,width=self.larg,height=self.haut,bg='ivory')
        self.can.pack()
        self.face = Face(self.can)
        self.b1=Button(self.master,text='Open it !',command=self.face.openMouth)
        self.b2=Button(self.master,text='Close it !',command=self.face.closeMouth)
        self.b1.pack(side=RIGHT)
        self.b2.pack(side=LEFT)
 
class Face():
    def __init__(self, can):
        self.can = can
        self.setup()
        
    def setup(self):
        self.can.delete(ALL)
        cc =[[100, 100, 80, 'red'],[70, 70, 15, 'blue'], 
        [130, 70, 15, 'blue'],[70, 70, 5, 'black'],
        [130, 70, 5, 'black'],[44, 115, 20, 'red'], 
        [156, 115, 20, 'red'],[100, 95, 15, 'purple']] 
        i =0
        while i < len(cc):
            el = cc[i] 
            self.circle(el[0], el[1], el[2], el[3])
            i += 1 
            
        self.opened_mouth = None
        self.closed_mouth = None
 
    def circle(self,x, y, r, coul ='black'):
        "Draw a circle center x,y radius r "
        self.can.create_oval(x-r, y-r, x+r, y+r, outline=coul)
    def openMouth(self):
        #self.can.delete(self.closed_mouth)
        self.setup()
        self.opened_mouth=self.circle(100, 145, 30, 'purple')
    def closeMouth(self):
        #self.can.delete(self.opened_mouth)
        self.setup()
        self.closed_mouth=self.can.create_line(80,145,120,145,fill='purple')

root = Tk()
A=Button_Can()
B=Face(A.can)
root.mainloop()

NOTE: I am more use to pygame's redraw everything style... every frame, so i am not sure if tkinter has a method to just delete a portion of the canvas or not. So i just redrew everything.