Untitled

import turtle

leo = turtle.Turtle()
leo.hideturtle()

circles=4 ##recommended that this variable is set to a number less than 18

size=circles*10
color=1
for i in range(int(circles)):
    if color==1:
        leo.color("blue")
    elif color==2:
        leo.color("red")
    elif color==3:
        leo.color("green2")
    elif color==4:
        leo.color("orange")
        color=0
    leo.begin_fill()
    leo.circle(size)
    leo.end_fill()
    size= size-10
    color=color+1