Python Turtle Expirement

from turtle import*
from random import randint

def kvadrat(t):
   t.forward(100)
   t.left(90)
   t.forward(100)
   t.left(90)
   t.forward(100)
   t.left(90)
   t.forward(100)
   t.left(90)
   return

colors = ["blue", "yellow", "red", "black", "purple", "pink", "green", "cyan", "lime", "brown", "blueviolet", "DarkOrchid", "coral", "darkcyan", "darkslateblue"]
i = 0
t1 = Turtle()
t2 = Turtle()
t3 = Turtle()
t4 = Turtle()
t5 = Turtle()
t6 = Turtle()
t7 = Turtle()

t1.right(30)
t2.left(210)
t4.left(180)
t5.left(30)
t6.left(150)
t7.left(60)
t1.speed(0)
t2.speed(0)
t3.speed(0)
t4.speed(0)
t5.speed(0)
t6.speed(0)
t7.speed(0)
angle = 5

while i < 1000:
    number_of_color = randint(0, len(colors) - 1)
    t1.color(colors[number_of_color])
    number_of_color = randint(0, len(colors) - 1)
    t2.color(colors[number_of_color])
    number_of_color = randint(0, len(colors) - 1)
    t3.color(colors[number_of_color])
    number_of_color = randint(0, len(colors) - 1)
    t4.color(colors[number_of_color])
    number_of_color = randint(0, len(colors) - 1)
    t5.color(colors[number_of_color])
    number_of_color = randint(0, len(colors) - 1)
    t6.color(colors[number_of_color])
    number_of_color = randint(0, len(colors) - 1)
    t7.color(colors[number_of_color])
    kvadrat(t1)
    kvadrat(t2)
    kvadrat(t3)
    kvadrat(t4)
    kvadrat(t5)
    kvadrat(t6)
    kvadrat(t7)
    t1.left(angle)
    t2.right(angle)
    t3.left(angle)
    t4.right(angle)
    t5.left(angle)
    t6.right(angle)
    t7.left(angle)
    i = i + 1
    if i % 72 == 0:
        angle = angle / 2

exitonclick()