1

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()

def left(event):
    global v_x, v_y
    v_x = -1
    v_y = 0
def right(event):
    global v_x, v_y
    v_x = 1
    v_y = 0

def down(event):
    global v_x, v_y
    v_x = 0
    v_y = -1

def up(event):
    global v_x, v_y
    v_x = 0
    v_y = 1

from tkinter import *
import time
root = Tk()
canvas = Canvas(root, height = (20+2) * 25, width = (30 + 2) *25)
canvas.pack()
root.bind("<Left>", left)
root.bind("<Right>", right)
root.bind("<Down>", down)
root.bind("<Up>", up)


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

win = True

v_x = -1
v_y = 0

while win:
    table_x = [table_x[0] + v_x] + table_x
    table_y = [table_y[0] + v_y] + table_y
    table_x.pop(-1)
    table_y.pop(-1)
    all()
    time.sleep(0.1)
    canvas.delete('all')


all()