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Python code snippet – How to track window size while resizing in tkinter?

from Tkinter import *

# create a canvas with no internal border
canvas = Canvas(bd=0, highlightthickness=0)
canvas.pack(fill=BOTH, expand=1)

# track changes to the canvas size and draw
# a rectangle which fills the visible part of
# the canvas

def configure(event):
    canvas.delete("all")
    w, h = event.width, event.height
    print(w)
    print(h)
    xy = 0, 0, w-1, h-1
    canvas.create_rectangle(xy)
    canvas.create_line(xy)
    xy = w-1, 0, 0, h-1
    canvas.create_line(xy)

canvas.bind("<Configure>", configure)

mainloop()
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