Python Tkinter Canvas FUN JAZZ

from tkinter import *
tk = Tk()
canvas = Canvas(width = 600,height = 600, bg = 'black')
canvas.pack()
x1 = 0
y1 = 0
x2 = 600
y2 = 600
for x in range(200):
    x1 = x1+3
    x2 = x2-3
    tk.update()
    canvas.create_line(x1,y1,x2,y2,width = 1,fill = 'white')
for x in range(120):
    y1 = y1+5
    y2 = y2-5
    tk.update()
    canvas.create_line(x1,y1,x2,y2,width = 1,fill = 'white')
x3 = 201
y3 = 201
for x in range(200):
    tk.update()
    canvas.create_rectangle(200,200,x3,y3,fill = 'black')
    x3 = x3 + 1
    y3 = y3 + 1

x4 = 200
y4 = 200
x5 = 200
y5 = 200
for x in range(40):
    x4 = x4+5
    y5 = y5+5
    tk.update()
    canvas.create_line(x4,y4,x5,y5,width = 2,fill = 'white')

for x in range(40):
    x5 = x5+5
    y4 = y4+5
    tk.update()
    canvas.create_line(x4,y4,x5,y5,width = 2,fill = 'white')

tk.mainloop()