import turtle as t 
import random

t.speed(0)
t.bgcolor('dark slate gray')
t.color('aqua')
# i = 0, i = 1, ...., 

colors = ['turquoise', 'gold', 'magenta', 'limegreen', 'coral']

for i in range(170):
    t.color(colors[random.randint(0, len(colors)- 1)]) 
    t.circle(i)
    t.left(5)

t.done()