[Python] when the snake touch the food, i know why the new food comes up but why the old food...

#food.py

from turtle import Turtle
import random

class Food(Turtle):

def __init__(self):
super().__init__()
self.shape("square")
self.penup()
self.shapesize(stretch_len= 0.5, stretch_wid= 0.5)
self.color("navy")
self.speed("fastest")
self.refresh()

def refresh(self):
random_x = random.randint(-280, 280)
random_y = random.randint(-280, 280)
self.goto(random_x, random_y)

#main.py

is_on = True
while is_on:
screen.update()
time.sleep(0.1)
snake.move()
if snake.segment[0].distance(food) < 15:
food.refresh()



when the snake(there is a snake which made of three turtles(square)) touch the food(distance < 15), i know why the new food comes up but why the old food disappears? there is not function that erase the old food

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