Day -16 Turtle flower

 import turtle

j = turtle.Turtle()
j.shape('turtle')
my_screen = turtle.getscreen()


def my_turtle(s):
    j.left(60)
    j.forward(s)
    j.left(30)
    j.circle(s/4, 180)
    j.left(180)
    j.circle(s/4, 180)
    j.left(30)
    j.forward(s)
    j.left(60)
n = 1
while n!=7:
    if n%2==0:
        my_screen.bgcolor("white")
        j.color("red")
    else:
        my_screen.bgcolor("black")
        j.color("blue")
    s = 100
    while s!=300:
        j.speed(10)
        my_turtle(s)
        s = s+50
    j.left(60)
    n+=1


my_screen.exitonclick()