snake

import pygame, sys
from math import *
heroPos = 209
clock = pygame.time.Clock()
screen = pygame.display.set_mode([720,540])
import random
cells = []
hey = bool
pos = []
applePos = random.randint(1,401)
for x in range(100):
    pos.append(0)
lenght = 0
clock = pygame.time.Clock()

dir = 0
for column in range(20):
    for line in range(20):
        cells.append([51 + 22 * column, 51 + 22 * line, 21, 21])

while True:
    if heroPos == applePos:
        lenght += 1
        applePos = random.randint(0, 401)


    screen.fill((0,0,0))
    pygame.draw.rect(screen, [0, 255, 0], cells[applePos])
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            sys.exit(0)
        if event.type == pygame.KEYDOWN and event.key == pygame.K_d:
            lenght += 1
        if event.type == pygame.KEYDOWN and event.key == pygame.K_SPACE:
            hey = True
        if event.type == pygame.KEYDOWN and event.key == pygame.K_RIGHT and not dir == 4:
            dir = 2
        if event.type == pygame.KEYDOWN and event.key == pygame.K_UP and dir != 3:
            dir = 1
        if event.type == pygame.KEYDOWN and event.key == pygame.K_DOWN and dir != 1:
            dir = 3
        if event.type == pygame.KEYDOWN and event.key == pygame.K_LEFT and dir != 2:
            dir = 4

    pygame.draw.rect(screen, [255 , 255, 255], [50, 50, 440, 440], 3)
    for x in range(20):
        pygame.draw.line(screen,[255,255,255], [50 + 22 * x, 50], [50 + 22 * x, 490], 1)
    for x in range(20):
        pygame.draw.line(screen,[255,255,255], [50, 50 + 22 * x], [490, 50 + 22 * x], 1)

    if hey == True:
        if True:
            clock.tick(8)
            if dir == 1:
                if heroPos % 20 != 0:
                    heroPos -= 1
                else:
                    print("stop")
                    dir = 0
                    hey = False
                    heroPos = 209
                    lenght = 0
            if dir == 2:
                if heroPos < 380:
                    heroPos += 20
                else:
                    print("stop")
                    dir = 0
                    hey = False
                    heroPos = 209
                    lenght = 0
            if dir == 3:
                if heroPos % 20 != 19:
                    heroPos += 1
                else:
                    print("stop")
                    dir = 0
                    hey = False
                    heroPos = 209
                    lenght = 0
            if dir == 4:
                if heroPos > 20:
                    heroPos -= 20
                else:
                    print("stop")
                    dir = 0
                    hey = False
                    heroPos = 209
                    lenght = 0
            if dir != 0:
                pos.insert(0, heroPos)
                pos.pop()
    for x in range(lenght):
        pygame.draw.rect(screen, [255, 0, 0], cells[pos[x + 1]])
        if pos[x + 1] == heroPos:
            print("stop")
            dir = 0
            hey = False
            heroPos = 209
            lenght = 0




    pygame.draw.rect(screen, [255, 0, 0], cells[heroPos])
    pygame.display.flip()