my first attempt at using python, tutoring, educational purposes, don't sue me, etc.

myFirst.py

CANVAS_WIDTH = 640
CANVAS_HEIGHT = 480

from Gui import *

# draws a bullseye circle from  yellow,green,cyan, and red in the center,
# a black circle, a green and blue vertical line, and a magenta square in the middle of the red circle in the bullseye
def part1():
    canvas.line([[-100, -100], [-100, 100]], fill = 'green')
    canvas.line([[100, 100],   [100, -100]], fill = 'blue')
    canvas.circle([-50, 50],   30,           fill = 'black')
    canvas.circle([0, 0],      50,           fill = 'yellow')
    canvas.circle([0, 0],      40,           fill = 'green')
    canvas.circle([0, 0],      30,           fill = 'cyan')
    canvas.circle([0, 0],      20,           fill = 'red')
    canvas.rectangle([[10, -10], [-10, 10]], fill = 'red')
    canvas.rectangle([[-20, 20], [0, 0]],    fill = 'magenta')

#What occurs after the button is pushed to create the location of the bullseye and targets,
#magenta canvas color, on the canvas
def part2():
    canvas.clear()
    canvas.config(bg = "green")
    target(canvas, [0, -100])
    target(canvas, [0, 0])
    target(canvas, [0, 100])
    target(canvas, [0, 150])
    bullseye(canvas, [-100, 20])
    bullseye(canvas, [0, 0])
    bullseye(canvas, [150, 0])

def target(myCanvas, myPoint):
    x, y = myPoint
    myCanvas.rectangle([[x - 20, y - 20],[x + 20, y + 20]], fill = 'magenta')
    myCanvas.circle([x - 10, y - 10], 10, fill = 'cyan', outline = 'blue')
    myCanvas.circle([x - 10, y + 10], 10, fill = 'cyan', outline = 'blue')
    myCanvas.circle([x + 10, y - 10], 10, fill = 'cyan', outline = 'blue')
    myCanvas.circle([x + 10, y + 10], 10, fill = 'cyan', outline = 'blue')
    myCanvas.circle([x - 10, y - 10], 8, fill = 'blue', outline = 'blue')
    myCanvas.circle([x - 10, y + 10], 8, fill = 'blue', outline = 'blue')
    myCanvas.circle([x + 10, y - 10], 8, fill = 'blue', outline = 'blue')
    myCanvas.circle([x + 10, y + 10], 8, fill = 'blue', outline = 'blue')
    myCanvas.circle([x - 10, y - 10], 5, fill = 'black', outline = 'blue')
    myCanvas.circle([x - 10, y + 10], 5, fill = 'black', outline = 'blue')
    myCanvas.circle([x + 10, y - 10], 5, fill = 'black', outline = 'blue')
    myCanvas.circle([x + 10, y + 10], 5, fill = 'black', outline = 'blue')

    #lines
    #canvas.line([[, ], [, ]], 'white')

# the outer circle is cyan; the middle circle is blue; the inner circle is black
# all 3 circles have a border of 2
# the space between the circles is 10.
def bullseye(myCanvas, myPoint):
    x, y = myPoint
    myCanvas.circle([x, y], 30, fill = 'cyan', outline = 'blue')
    myCanvas.circle([x, y], 25, fill = 'blue', outline = 'blue')
    myCanvas.circle([x, y], 20, fill = 'black', outline = 'blue')

###################################################################
# Feel free to read what's here, but do not change
g = Gui()
g.title('Homework 4')

# canvas is the drawing area
canvas = g.ca(width = CANVAS_WIDTH, height = CANVAS_HEIGHT)

part1()
# this sets up the padded row with one button
# the button callback is to the part2() function
g.row(pady = 10, padx = 100)
button = g.bu(text='click this', command=part2, bg='yellow')
g.endrow()
g.mainloop()