Python - Tkinter - dodawanie i usuwanie obrazkow z Canvas

from tkinter import PhotoImage, Canvas, Tk, NW, NE, X
from PIL import Image
#from point import Point

class DrawingArea():

    def __init__(self, window):

        self.canvas_width = 920
        self.canvas_height = 640

        self.canvas = Canvas(window, width=self.canvas_width, height=self.canvas_height, border=2, relief="sunken")
        self.canvas.pack(side="left", fill="both", expand=True)

        # dodanie tla do canvas
        self.image = PhotoImage(file="img/image1.png")
        self.canvas.create_image(self.canvas_width, 0, anchor='ne', image=self.image)

        # do przechowywania wszystkich obrazkow
        self.images = []

        # do przechowywania ID obrazkow na canvas
        self.images_id = []

        #self.checkered(40)
        self.b1 = "UP"
        self.xold, self.yold = None, None

        self.canvas.bind('<Button-1>', self.pressed) # lewy button

    def checkered(self, line_distance):

        # vertical lines at an interval of "line_distance" pixel
        for x in range(line_distance, self.canvas_width, line_distance):
            self.canvas.create_line(x, 0, x, self.canvas_height, fill="#476042")

        # horizontal lines at an interval of "line_distance" pixel
        for y in range(line_distance, self.canvas_height, line_distance):
            self.canvas.create_line(0, y, self.canvas_width, y, fill="#476042")

    def pressed(self, event):
        self.b1 = "DOWN"           # you only want to draw when the button is down
        x = int(event.x) - ( int(event.x) % 40 )
        y = int(event.y) - ( int(event.y) % 40 )

        #self.canvas.create_rectangle(x,y, x+40,y+40, fill="blue")

        # wczytanie i zapamietanie na liscie
        img = PhotoImage(file="img/tile.png")
        self.images.append(img)

        # dodanie do canvas
        img_id = self.canvas.create_image(x+20, y+20, image=img)

        # zapamietanie ID obrazka
        self.images.append(img_id)

        # dodanie prawego przycisku do obrazka
        self.canvas.tag_bind(img_id, '<Button-3>', lambda event:self.delete_image(event, img_id)) # prawy button

        print("x/y/id: %i %i %d" % (x, y, img_id) )      # because "Motion" events happen -all the time-


    def released(self, event):
        self.b1 = "UP"
        self.xold = None           # reset the line when you let go of the button
        self.yold = None


    def delete_image(self, event, img_id):
        print("RIGHT BUTTON")
        print("delete_image event:", event, event.x, event.y)
        print("delete_image img_id:", img_id)

        # usuniecie z canvas
        self.canvas.delete(img_id)

        # szukanie na liscie ID
        if img_id in self.images_id:
            index = self.images_id.index(img_id)

            # usuniecie z listy ID
            del self.images_id[index]
            # usuniecie z listy obrazkow
            del self.images[index]


if __name__=="__main__":
    window = Tk()
    app = DrawingArea(window)
    window.mainloop()