!!!!

def elem(i, j):
    canvas.create_oval((i + 1) * 25, (j + 1) * 25, (i + 2) * 25, (j + 2) * 25, fill = "green")

def snake():
    global table_x, table_y
    i = 0
    while i < len(table_x):
        elem(table_x[i], table_y[i])
        i+=1

def all():
    snake()
    canvas.update()

from tkinter import *
import time
root = Tk()
canvas = Canvas(root, height = (20+2) * 25, width = (30 + 2) *25)
canvas.pack()

table_x = [5, 6, 7, 8]
table_y = [3, 3, 3, 3]

all()