Tkinter Key Binding in Different Regions of Window

When function x1 is called in response to a mouse click, the event object has the mouse click x and y co-ordinates (event.x and event.y). Use those to detect which part of the canvas was clicked on and act accordingly.

Here is how you can use the event co-ordinates to identify which square of the tic-tac-toe board the user clicked on:

from tkinter import *# Creates Windowtk = Tk()width = 600third = width / 3canvas = Canvas(tk, width=width, height=width)tk.title('Tic Tac Toe')canvas.pack# Creates Boardcanvas.create_line(third, 0, third, width)canvas.create_line(third*2, 0, third*2, width)canvas.create_line(0, third, width, third)canvas.create_line(0, third*2, width, third*2)def draw_cross(row,col):    canvas.create_line(col * third, row * third, (col + 1) * third, (row + 1) * third)    canvas.create_line((col + 1) * third, row * third, col * third, (row + 1) * third)def mouse_click(event):    col = int(event.x / third)    row = int(event.y / third)    draw_cross(row,col)canvas.pack()canvas.bind("<Button-1>", mouse_click)canvas.mainloop()

First of all I parametrized the board dimensions using variables width and third - just change width, and everything will resize correctly.

Second, clicking a mouse button on the canvas calls the mouse_click event handler, which obtains the co-ordinates of the point in the canvas on which the mouse was clicked (event.x and event.y), and computes the corresponding row (0, 1 or 2) and column (0, 1 or 2) of the square on the tic-tac-tow board. These are then passed as parameters to the function draw_cross which draws the two diagonals for that square.

Hope that helps.