turtle,余数

import turtle as z
q = z.Pen()
q.speed(100)
z.bgcolor("black")
q.hideturtle()
aaa = ['red','orange','yellow','lime','lightseagreen','blue','purple']
aaaa = 7
for i in range(300):
    q.forward(i-1)
    q.left(360/7*2)
    q.pencolor(aaa[i % aaaa])
    q.pensize(i/100)
z.done()