Python: Mouse Movements using Ctypes

Dear Friends,

Below script will move the Mouse cursor in a rectangle shape. 

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import ctypes
import time
for x in range(300,850,10):
    ctypes.windll.user32.SetCursorPos(x, 200)
    time.sleep(0.1)
for x in range(200,600,10):
    ctypes.windll.user32.SetCursorPos(850, x)
    time.sleep(0.1)
for x in range(850,200,-10):
    ctypes.windll.user32.SetCursorPos(x, 600)
    time.sleep(0.1)
for x in range(600,200,-10):
    ctypes.windll.user32.SetCursorPos(200, x)
    time.sleep(0.1)

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1. The rectangle is not perfect as far as I know.