2.py

import turtle

pen=turtle.Pen()
screen=turtle.Screen()
screen.bgcolor("black")
pencolors=["red","blue","orange","green"]
pen.speed(50)

for i in range(1,300):
    pen.color((pencolors[i%4]))
    pen.forward(i)
    pen.right(91)

pen.hideturtle()
turtle.done()