Error (Please help!!!!!)

[foksikrasa]

I and my tutor have been working on this project but it doesn't work. Even he can't find the error please help .
(It is supposed to let you draw and then save your picture)

Many thanks,
foksikrasa

from tkinter import *
from PIL import Image, ImageDraw
import io
import os
import subprocess

canvas_width = 1000
canvas_height = 1000
color = 'black'
brush_size = 1
def paint(event):
    global brush_size
    global color
    x1 = event.x - brush_size
    x2 = event.x + brush_size
    y1 = event.y - brush_size
    y2 = event.y + brush_size
    w.create_oval(x1, y1, x2, y2, fill = color, outline=color)

def save_as_gpg():
#    saveIMG()
    print("Picture saving...")
    w.postscript(file = "Picture.eps", colormode='color')
    img = Image.open("Picture.eps")
#    draw = ImageDraw.Draw(img)
#    draw.text((10, 20), "Chao!", (0, 0, 0))
    img.save("Picture.png", "png")

def brush_size_change(new_brush_size):
    global brush_size
    brush_size += new_brush_size
    if brush_size < 1:
        brush_size = 1
    set_brush_size(brush_size)
        
def color_change(new_color):
    global color
    color = new_color
    
def set_brush_size(new_brush_size):
    brush_label.configure(text = "brush = " + str(new_brush_size))
   
def update_brush_size_from_entry():
    global brush_size
    brush_size = int(b_entry.get())
    if brush_size < 1:
        brush_size = 1
    set_brush_size(brush_size)
    
def saveIMG():
    print("Picture saving...")
    w.update()
    w.postscript(file = 'Picture.eps', colormode = "color")

root = Tk()
root.title('Paint')
w = Canvas(root, width = canvas_width, height = canvas_height, bg='white')
w.bind('<B1-Motion>', paint)
w.grid(row=2, column=5)
w.columnconfigure(6, weight=1)
w.rowconfigure(2, weight=1)

red_btn = Button(text='Красный цвет', width=10, command = lambda: color_change('red'), bg = 'red')
red_btn.grid(row =  0, column=6)

Black_btn = Button(text='чёрный', width=10, command = lambda: color_change('black'), bg = 'black')
Black_btn.grid(row =  0, column=1)

Purple_btn = Button(text='фиолетовый', width=10, command = lambda: color_change('purple'), bg = 'purple')
Purple_btn.grid(row =  0, column=2)

Blue_btn = Button(text='синий', width=10, command = lambda: color_change('blue'), bg = 'blue')
Blue_btn.grid(row =  0, column=3)

green_btn = Button(text='Зеленый', width=10, command = lambda: color_change('green'), bg = 'green')
green_btn.grid(row =  0, column=4)

Orange_btn = Button(text='оранжевый', width=10, command = lambda: color_change('orange'), bg = 'orange')
Orange_btn.grid(row =  0, column=7)

Yellow_btn = Button(text='желтый', width=10, command = lambda: color_change('yellow'), bg = 'yellow')
Yellow_btn.grid(row =  0, column=8)

white_btn = Button(text='Ластик', width=10, command = lambda: color_change('white'), bg = 'white')
white_btn.grid(row =  0, column=9)

clear_btn = Button(text='Стереть все', width=10, command = lambda: w.delete('all'))
clear_btn.grid(row=0,column=5)

brush_plus = Button(text='Bigger', width=10, command = lambda: brush_size_change(1))
brush_plus.grid(row=3,column=1)

brush_minus = Button(text='Smaller', width=10, command = lambda: brush_size_change(-1))
brush_minus.grid(row=3,column=2)

b_entry = Entry(root, width = 10)
b_entry.grid(row=3,column=4)

update_brush_size = Button(text='Update', width=10, command = lambda: update_brush_size_from_entry())
update_brush_size.grid(row=3,column=5)

save_btn = Button(text='Save', width=10, command = lambda: save_as_gpg())
save_btn.grid(row=3,column=6)

brush_label = Label(root, width=10, text = "brush =")
brush_label.grid(row=3,column=3)


root.mainloop()