from turtle import Turtle

tina = Turtle()
'''
The draw_circle function takes the Turtle name, radius in pixels, color and position
(as an x,y tuple) and then draws a circle.
'''

def draw_circle(t_name, r, col,p):
    t_name.penup()
    t_name.goto(p)
    t_name.color(col)
    t_name.dot(r*2)

'''
The following 9 calls to draw_circle will draw an "X" made of blue, red and yellow circles
on the turtle graphics display canvas
'''
draw_circle(tina, 50, "blue",(100,100))
draw_circle(tina, 100, "red",(300,300))
draw_circle(tina, 75, "yellow",(0,0))
draw_circle(tina, 50, "blue",(100,-100))
draw_circle(tina, 100, "red",(300,-300))
draw_circle(tina, 50, "blue",(-100,100))
draw_circle(tina, 100, "red",(-300,300))
draw_circle(tina, 50, "blue",(-100,-100))
draw_circle(tina, 100, "red",(-300,-300))