Design with turtle

import turtle

turtle.speed(0)

turtle.bgcolor("black")

for i in range(15):

for colours in ("red", "magenta", "yellow", "orange", "blue", "green", "purple"):

turtle.color(colours)

turtle.pensize(3)

turtle.left(4)

turtle.forward(200)

turtle.left(90)

turtle.forward(200)

turtle.left(90)

turtle.forward(200)

turtle.left(90)

turtle.forward(200)

turtle.left(90)