import turtle

colors = ['red', 'yellow', 'green', 'purple', 'blue', 'orange']

pen = turtle.Pen()
pen.speed(10)

turtle.bgcolor('black')

for x in range(200):
    pen.pencolor(colors[x%6])
    pen.width(x/100 + 1)
    pen.forward(x)
    pen.left(59)

turtle.done()