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import turtle
import colorsys

turtle.bgcolor('black')

squary = turtle.Turtle()
squary.speed(20)
h = 0

# squary.pencolor('red')

for i in range(400):
    squary.pencolor(colorsys.hsv_to_rgb(h, 1, 1))
    squary.left(102)
    squary.forward(i)
   
    h += 0.005

turtle.done()