[Python] snake not eating food

I'm working on a simple Snake game in Python using curses, and I'm having an issue with the snake not properly eating the food. The snake seems to move over the food, but it doesn't get longer. Can someone please help me identify what's causing this issue and how I can fix it?

import curses
from random import randint

def create_food(snake, box):
food = None
while food is None:
food = [randint(box[0]+1, box[1]-1), randint(box[2]+1, box[3]-1)]
if food in snake:
food = None
return food

def main(stdscr):
curses.curs_set(0)
stdscr.timeout(100)

sh, sw = stdscr.getmaxyx()
w = curses.newwin(sh, sw, 0, 0)
w.keypad(1)

box = [3, sh-3, 3, sw-3]
snake = [
[sh//2, sw//2],
[sh//2, sw//2-1],
[sh//2, sw//2-2]
]

food = create_food(snake, box)

key = curses.KEY_RIGHT

while True:
next_key = w.getch()
key = key if next_key == -1 else next_key

head = [snake[0][0], snake[0][1]]

if key == curses.KEY_DOWN:
head[0] += 1
elif key == curses.KEY_UP:
head[0] -= 1
elif key == curses.KEY_LEFT:
head[1] -= 1
elif key == curses.KEY_RIGHT:
head[1] += 1

snake.insert(0, head)

if head == food:
food = None
else:
tail = snake.pop()

w.addch(food[0], food[1], curses.ACS_PI)

w.addch(tail[0], tail[1], ' ')

w.addch(snake[0][0], snake[0][1], '*')

if (
snake[0][0] in [box[0], box[1]] or
snake[0][1] in [box[2], box[3]] or
snake[0] in snake[1:]
):
break

curses.wrapper(main)



i need the snake to get longer when eats food

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