# Tk_array_click.py

# Tk_array_click.py

try:
    # Python2
    from Tkinter import *
except ImportError:
    # Python3
    from tkinter import *
#
r,c=8,8
grid=[[-1]*r  for n in range(c)] # list comprehension
grid[0][0]=1
grid[7][7]=1

w=70 # width of each cell

root=Tk()
root.geometry('{}x{}+0+0'.format(w*r,w*c)) #.format(root.winfo_screenwidth())
root.title('2D')
canvas=Canvas(root, width=1200, height=1200, background='grey')

def draw_grid():
    x,y=0,0 # starting position

    for row in grid:
        for col in row:
          color='white'
          if col == 1:
              color='red'
          canvas.create_rectangle(x, y, x+w, y+w, fill=color)
          x+=w
        y+=w
        x=0
#
def mouse(event):
    x,y=event.x/w,event.y/w
    print
    print "clicked at", event.x, event.y, '\t\t',(x,y)
    grid[y][x]=-1 * grid[y][x] # Note: grid[Y][X] not grid[X][Y]
    color='white'
    if grid[y][x] == 1: color='red'
    x*=w
    y*=w
    canvas.create_rectangle(x, y, x+w, y+w, fill=color)
#

canvas.bind("<Button-1>", mouse)
draw_grid()
canvas.pack()