Snake Game.py

import pygame
import random
import sys
# Initialize pygame
pygame.init()
# Screen size
WIDTH = 600
HEIGHT = 400
BLOCK = 20

screen = pygame.display.set_mode((WIDTH, HEIGHT))
pygame.display.set_caption("Snake Game")

# Colors
WHITE = (255, 255, 255)
GREEN = (0, 200, 0)
RED = (200, 0, 0)
BLACK = (0, 0, 0)

clock = pygame.time.Clock()
font = pygame.font.SysFont("Arial", 25)

def draw_snake(snake_list):
    for block in snake_list:
        pygame.draw.rect(screen, GREEN, [block[0], block[1], BLOCK, BLOCK])

def message(text, color):
    msg = font.render(text, True, color)
    screen.blit(msg, [WIDTH / 6, HEIGHT / 3])

def game():
    x = WIDTH // 2
    y = HEIGHT // 2

    x_change = 0
    y_change = 0

    snake_list = []
    snake_length = 1

    food_x = random.randrange(0, WIDTH - BLOCK, BLOCK)
    food_y = random.randrange(0, HEIGHT - BLOCK, BLOCK)

    game_over = False
    game_close = False

    while not game_over:

        while game_close:
            screen.fill(BLACK)
            message("Game Over! Press Q to Quit or C to Play Again", RED)
            pygame.display.update()

            for event in pygame.event.get():
                if event.type == pygame.QUIT:
                    pygame.quit()
                    sys.exit()
                if event.type == pygame.KEYDOWN:
                    if event.key == pygame.K_q:
                        pygame.quit()
                        sys.exit()
                    if event.key == pygame.K_c:
                        game()

        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                game_over = True

            if event.type == pygame.KEYDOWN:
                if event.key == pygame.K_LEFT:
                    x_change = -BLOCK
                    y_change = 0
                elif event.key == pygame.K_RIGHT:
                    x_change = BLOCK
                    y_change = 0
                elif event.key == pygame.K_UP:
                    y_change = -BLOCK
                    x_change = 0
                elif event.key == pygame.K_DOWN:
                    y_change = BLOCK
                    x_change = 0

        x += x_change
        y += y_change

        # Wall collision
        if x < 0 or x >= WIDTH or y < 0 or y >= HEIGHT:
            game_close = True

        screen.fill(BLACK)

        pygame.draw.rect(screen, RED, [food_x, food_y, BLOCK, BLOCK])

        snake_head = []
        snake_head.append(x)
        snake_head.append(y)
        snake_list.append(snake_head)

        if len(snake_list) > snake_length:
            del snake_list[0]

        # Self collision
        for block in snake_list[:-1]:
            if block == snake_head:
                game_close = True

        draw_snake(snake_list)

        pygame.display.update()

        # Food collision
        if x == food_x and y == food_y:
            food_x = random.randrange(0, WIDTH - BLOCK, BLOCK)
            food_y = random.randrange(0, HEIGHT - BLOCK, BLOCK)
            snake_length += 1

        clock.tick(10)  # Game speed

    pygame.quit()
    sys.exit()

game()