My code (pygame) stops working after 1 or 2 seconds of runtime. Why?

Question

So I wrote a code and when I start it, it runs for 1-2 seconds but then it eventually stops. Here is the problem: I press start then the window pops up with the name of the code/game and with the background color, but nothing else happens. Then it closes. I get this exit code every time:

Process finished with exit code 0

I don't know why it does this, but I am really curious. If someone can figure it out I would be more than happy.

Thanks in advance!

Here is the code:

import random

import pygame

pygame.init()
clock = pygame.time.Clock()

orangecolor = (255, 123, 7)
greencolor = (0, 255, 0)
blackcolor = (0, 0, 0)
redcolor = (213, 50, 80)
bluecolor = (50, 153, 213)

display_width = 600
display_height = 400
dis = pygame.display.set_mode((display_width, display_height))
pygame.display.set_caption('Snake')
snake_block = 10
snake_speed = 15
snake_list = []


def snake(snake_block, snake_list):
    for x in snake_list:
        pygame.draw.rect(dis, greencolor, [x[0], x[1], snake_block, snake_block])


def snakegame():
    game_over = False
    game_end = False
    x1 = display_width / 2
    y1 = display_height / 2
    x1_change = 0
    y1_change = 0

    snake_list = []
    Length_of_snake = 1

    foodx = round(random.randrange(0, display_width - snake_block) / 10.0) * 10.0
    foody = round(random.randrange(0, display_height - snake_block) / 10.0) * 10.0

    while not game_over:
        while game_end:
            score_font = pygame.font.SysFont("timesnewromanpsmt", 35)
            dis.fill(blackcolor)
            mesg = score_font.render("Press 'P' to start again", True, greencolor)
            dis.blit(mesg, [display_width / 6, display_height / 3])

            score = Length_of_snake - 1
            value = score_font.render("Your score: " + str(score), True, greencolor)
            dis.blit(value, [display_width / 3, display_height / 5])
            pygame.display.update()

        for event in pygame.event.get():
            if event.type == pygame.KEYDOWN:
                if event.key == pygame.K_p:
                    snakegame()
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                game_over = True
                game_end = True

            if event.type == pygame.KEYDOWN:
                if event.key == pygame.K_LEFT:
                    x1_change = snake_block
                    y1_change = 0
                elif event.key == pygame.K_RIGHT:
                    x1_change = snake_block
                    y1_change = 0
                elif event.key == pygame.K_UP:
                    y1_change = snake_block
                    x1_change = 0
                elif event.key == pygame.K_LEFT:
                    y1_change = snake_block
                    x1_change = 0
        if x1 >= display_width or x1 < 0 or y1 >= display_height or y1 < 0:

            x1 += x1_change
            y1 += y1_change
            dis.fill(blackcolor)
            pygame.draw.rect(dis, redcolor, [foodx, foody, snake_block, snake_block])
            snake_Head = [x1, y1]
            snake_list.append(snake_Head)
            if len(snake_list) > Length_of_snake:
                del snake_list[0]

            for x in snake_list[:-1]:
                if x == snake_Head:
                    game_end = True
            snake(snake_block, snake_list)
            pygame.display.update()
            if x1 == foodx and y1 == foody:
                foodx = round(random.randrange(0, display_width - snake_block) / 10.0) * 10.0
                foody = round(random.randrange(0, display_height - snake_block) / 10.0) * 10.0
                Length_of_snake += 1
                clock.tick(snake_speed)
    pygame.quit()
    quit()
    snakegame()