snakeGame.py

import pygame,sys,random,time

#check for initializing errors
check_errors = pygame.init()
if check_errors[1]>0:
    print("(!) Had {0} initializing errors,exiting ...".format(check_errors[1]))
    sys.exit(-1)
else:
    print("(+) PyGame Successfully Initialized1")
    
#play surface
playSurface=pygame.display.set_mode((720,460))
pygame.display.set_caption("Snake Game")

#colors
red=pygame.Color(255,0,0)#gameover
green=pygame.Color(0,255,0)#snake
black=pygame.Color(0,0,0)#snake
white=pygame.Color(255,255,255)#background
brown=pygame.Color(165,42,42)#food

#FPS(FRAMES PER SECOND)Controller
fpsController=pygame.time.Clock()

#Important Variable
snakePos=[100,50]
snakeBody=[[100,50],[90,50],[80,50]]

foodPos=[random.randrange(1,72)*10,random.randrange(1,46)*10]
foodSpawn=True

direction='RIGHT'
changeTo=direction
score=0

#game over function
def gameOver():
    myFont=pygame.font.SysFont('monaco',72)
    GOsurf=myFont.render('Game Over!',True,red)
    GOrect=GOsurf.get_rect()
    GOrect.midtop=(360,15)
    playSurface.blit(GOsurf,GOrect)
    
    showScore(0)
    pygame.display.flip()
    time.sleep(4)  
    pygame.quit()#pygame exit
    sys.exit()#console exit
def showScore(choice=1):
    sFont=pygame.font.SysFont('monaco',24)
    Ssurf=sFont.render('Score :{0}'.format(score),True,black)
    Srect=Ssurf.get_rect()
    if choice==1:
        Srect.midtop=(80,10)  
    else:
        Srect.midtop=(360,120)
        
    playSurface.blit(Ssurf,Srect)

#Main Logic of the game
while True:
    for event in pygame.event.get():
            if event.type==pygame.QUIT:
                pygame.quit()
                sys.exit()
            elif event.type==pygame.KEYDOWN:
                if event.key==pygame.K_RIGHT or event.key== ord('d'):
                    changeTo='RIGHT'
                if event.key==pygame.K_LEFT or event.key== ord('a'):
                    changeTo='LEFT'
                if event.key==pygame.K_UP or event.key== ord('w'):
                    changeTo='UP'
                if event.key==pygame.K_DOWN or event.key== ord('s'):
                    changeTo='DOWN'    
                if event.key==pygame.K_ESCAPE:
                    pygame.event.post(pygame.event.Event(pygame.QUIT))
                    
#validation of direction
    if changeTo=='RIGHT' and not direction=='LEFT':
        direction='RIGHT'
    if changeTo=='LEFT' and not direction=='RIGHT':
        direction='LEFT'
    if changeTo=='UP' and not direction=='DOWN':
        direction='UP'
    if changeTo=='DOWN' and not direction=='UP':
        direction='DOWN' 
    
#update snake position
    if  direction=='RIGHT':
        snakePos[0]=snakePos[0]+10 
    if  direction=='LEFT':
        snakePos[0]=snakePos[0]-10 
    if direction=='UP':
        snakePos[1]=snakePos[1]-10 
    if direction=='DOWN':
        snakePos[1]=snakePos[1]+10 
    
#snake body mechanism
    snakeBody.insert(0,list(snakePos))
    if snakePos[0]==foodPos[0]and snakePos[1]==foodPos[1] :
        score+=1
        foodSpawn=False
    else:
        snakeBody.pop()
    
    if foodSpawn==False:
        foodPos=[random.randrange(1,72)*10,random.randrange(1,46)*10]
    foodSpawn=True

    playSurface.fill(white)
    for pos in snakeBody:
        pygame.draw.rect(playSurface,green,
        pygame.Rect(pos[0],pos[1],10,10))
    pygame.draw.rect(playSurface,brown,
    pygame.Rect(foodPos[0],foodPos[1],10,10))
    #bound
    if snakePos[0]>710 or snakePos[0]<0:
        gameOver()
    if snakePos[1]>455 or snakePos[1]<0:
        gameOver()
    for block in snakeBody[1:]:
        if snakePos[0]==block[0] and snakePos[1]==block[1]:
            gameOver()
             
    showScore()
    pygame.display.flip()
    fpsController.tick(23)