from tkinter import *
import random
import time
class Game:
    def __init__(self):
        self.tk = Tk()
        self.tk.title("Создал игру Андрей")
        self.tk.resizable(0, 0)
        self.tk.wn_attributes("-topmost", 1)
        self.canvas = Canvas(self.tk, width=500, height=500, highlightthickness=0)
        self.canvas.pack()
        self.tk.update()
        self.canvas_height = 500
        self.canvas_width = 500
        self.bg = PhotoImage(file="background.gif")
        w = self.bg.width()
        h = self.bg.height()
        for x in range(0, 5):
            for y in range(0, 5):
                self.canvas.create_image(x * w, y * h, image=self.bg, anchor='nw')
        self.sprites = []
        self.running = True
g = Game()
g.mainloop()

Python 3.6.5 (v3.6.5:f59c0932b4, Mar 28 2018, 16:07:46) [MSC v.1900 32 bit (Intel)] on win32
Type "copyright", "credits" or "license()" for more information.
>>> 
 RESTART: C:/Users/mocom/AppData/Local/Programs/Python/Python36-32/my_game_2.py 
Traceback (most recent call last):
  File "C:/Users/mocom/AppData/Local/Programs/Python/Python36-32/my_game_2.py", line 23, in <module>
    g = Game()
  File "C:/Users/mocom/AppData/Local/Programs/Python/Python36-32/my_game_2.py", line 9, in __init__
    self.tk.wn_attributes("-topmost", 1)
  File "C:\Users\mocom\AppData\Local\Programs\Python\Python36-32\lib\tkinter\__init__.py", line 2098, in __getattr__
    return getattr(self.tk, attr)
AttributeError: '_tkinter.tkapp' object has no attribute 'wn_attributes'
>>>