Возможно, попробуйте это:
import tkinter
import time
root = tkinter.Tk()
can = tkinter.Canvas(root, width = 10, height = 10)
can.rowconfigure(0, weight=1)
can.columnconfigure(0, weight=1)
can.grid()
root.rowconfigure(0, weight=1)
root.columnconfigure(0, weight=1)
for i in range(10):
can.configure(width = i * 50, height = i * 50)
root.update()
print(i)
time.sleep(0.5)