# drawing.py
# ----------
# By ____(you)___________
#
# (Briefly describe what this program does.)

from turtle import *
from argparse import ArgumentParser
import turtle

def draw_ring(ring):
        radius = ring*50
        circle(radius,360)
        penup()
        right(90)
        forward(50)
        left(90)
        pendown()


def draw_electron():
        pencolor("red")
        turtle.dot(15)

def return_to_center():
        penup()
        turtle.goto(0,0)

'''def position_electrons(number):
        return_to_center()


        circle(radius*2,360)
        penup()
        right(90)
        forward(50)
        left(90)
        pendown()
        circle(radius*3)'''
        

'''parser= ArgumentParser("python drawing.py")
parser.add_argument("radius", type=int)
args = parser.parse_args()'''


for ring in range(4):                   #draws rings
    draw_ring(ring)
return_to_center()                      #returns to center
forward(50)
draw_electron()
back(100)
draw_electron()
return_to_center()
forward(100)
draw_electron()
back(200)
draw_electron()
return_to_center()
right(90)
forward(100)
draw_electron()
back(200)
draw_electron()
input()