snakegame.py

import pygame 
import random 
import time 
pygame.init() 
black=(0,0,0)#snake 
food=(139,69,19)#food 
light=(250,235,215)#background 
width,height=600,400 
game_screen=pygame.display.set_mode((width,height)) 
pygame.display.set_caption("My Snake") 
#snake and food initial positions 
snake_x,snake_y=width/2,height/2 
change_x=0 
change_y=0 
food_x=random.randrange(0,width)//10*10 
food_y=random.randrange(0,height)//10*10 
#game variables 
clock=pygame.time.Clock() 
snake_body=[(snake_x,snake_y)] 
game_over=False 
def display_snake_and_food(): 
    global food_x 
    global food_y 
    global snake_x,snake_y 
    global game_over 
     
     
    snake_x=(snake_x+change_x)%width 
    snake_y=(snake_y+change_y)%height 
#check if colides itself  
    if((snake_x, snake_y) in snake_body[1:]): 
        game_over=True 
        return 
#add the new head of the snake 
    snake_body.append((snake_x,snake_y)) 
 
    if(food_x==snake_x and food_y==snake_y): 
        food_x=random.randrange(0,width)//10*10 
        food_y=random.randrange(0,height)//10*10 
    else: 
        del snake_body[0] 
         
    game_screen.fill((light)) 
    pygame.draw.rect(game_screen,(food),[food_x,food_y,10,10]) 
    for(x,y) in snake_body: 
        pygame.draw.rect(game_screen,(black),[x,y,10,10]) 
         
    pygame.display.update() 
 
def show_game_over(): 
            font = pygame.font.Font(pygame.font.get_default_font(),16) 
            text = font.render('GAME OVER. Play Again? (Enter Y or N)',True,(255,0,0)) 
            text_rect = text.get_rect(center=(width /2, height /2)) 
            game_screen.blit(text, text_rect) 
            pygame.display.update() 
            pygame.display.flip() 
 
def reset_game(): 
    global snake_x, snake_y, change_x, snake_y, food_x, food_y, snake_body, game_over 
    snake_x, snake_y = width /2, height/2 
    change_x, change_y =0, 0 
    food_x = random.randrange(0,width) // 10*10 
    food_y = random.randrange(0,height) // 10*10 
    snake_body = [(snake_x, snake_y)] 
    game_over = False 
 
while True: 
    if game_over: 
        show_game_over() 
        pygame.event.clear() 
        waiting_for_input = True 
        while waiting_for_input: 
            for event in pygame.event.get(): 
                if event.type == pygame.QUIT: 
                    pygame.quit() 
                    quit() 
                if event.type == pygame.KEYDOWN: 
                    if event.key == pygame.K_y:  # Restart the game 
                        reset_game() 
                        waiting_for_input = False 
                    elif event.key == pygame.K_n:  # Quit the game 
                        pygame.quit() 
                        quit() 
                else: 
                    continue 
                break 
         
 
    for event in pygame.event.get(): 
        if event.type == pygame.QUIT: 
            pygame.quit() 
            quit() 
        if(event.type==pygame.KEYDOWN): 
            if(event.key==pygame.K_LEFT): 
                change_x=-10 
                change_y=0 
            elif(event.key==pygame.K_RIGHT): 
                change_x=10 
                change_y=0 
            elif(event.key==pygame.K_UP): 
                change_y=-10 
                change_x=0 
            elif(event.key==pygame.K_DOWN): 
                change_x=0 
                change_y=10 
                 
    display_snake_and_food() 
    clock.tick(9)