Python Turtle Graphics Design

from turtle import *

bgcolor('black')
speed(0)
pensize(4)
dis=180
colors=('cyan','red','blue','purple','yellow','violet','green')

for col in colors:
color(col)
for j in range(8):
lt(45)
for i in range(2):
fd(dis)
lt(60)
fd(dis)
lt(120)
dis=dis-20
done()