snake game RPI | Python Fiddle

import pygame 
import time 
import random 
pygame.init() 
white = (255,255,255) #makes the color said in variable
red = (255,0,0) #makes the color said in variable
black = (0,0,0) #makes the color said in variable
green = (0, 155, 0)#makes the color said in variable
display_width = 800 #sets display width 
display_hight=600 # sets display hight
FPS = 30 #sets the frames per second
block_size = 10 #pixle size
 
Font = pygame.font.SysFont(None, 25)# sets the font

def snake(block_size, snakelist):
    for XnY in snakelist :
        pygame.draw.rect(gameDisplay,green, [XnY[0], XnY[1],block_size , block_size])  #makes the snake

def message_to_screen(msg,color): 
	screen_text = font.render(msg,true,color) 
	gameDisplay.blit(screen_text, [display_width/2, display_hight/2] ) 
 
GameDisplay = pygame.display.set_mode((display_width,display_hight)) # sets screen  
pygame.display.set_caption("snake") 
 
 
 
clock = pygame.time.Clock() 
def gameLoop(): 
	gameExit = False 
	gameOver = False 
    
	lead_x = display_width/2 
	lead_y = display_hight/2 
    
	lead_x_change = 0 
	lead_y_change=0 
    
    snakelist = []
    snakehead = []
    snakehead.append(lead_x)
    snakehead.append(lead_y)
    snakelist.append(snakehead)
    snake(block_size, snakelist)
    
    
	randAppleX = round (random.randrange(0, display_width- block_size)/10.0)*10.0  
	randAppleY = round (random.randrange(0, display_hight- block_size)/10.0)*10.0  
    
	while not gameExit: 
        
		while gameOver == True: 
            
			gameDisplay.fill(white) 
			message_to_screen("game over, press C to continue or Q to Quit", red) 
			pygame.display.update() 
            
			for event in pygame.event.get(): 
                
				if event.type == pygame.KEYDOWN: 
                    
					if event.key == pygame.k_q: 
						gameExit == true 
						gameOver = False 
					if event.key == pygame.k_c: 
						gameLoop() 
 
                        
		for event in pygame.event.get(): 
            
			if event.type == pygame.QUIT: 
				gameExit = True #quits game 
			if event.type ==pygame.KEYDOWN:
				if event.key == pygame.K_LEFT:
					lead_x_change  = -block_size 
					lead_y_change = 0  
                if event.key == pygame.k_RIGHT: 
					lead_x_change = block_size 
					lead_y_change = 0  
                if event.key == pygame.K_DOWN: 
					lead_y_change =-block_size
					lead_x_change = 0  
                if event.key == pygame.k_UP: 
					lead_y_change = block_size 
					lead_x_change = 0 
 
if lead_x  >= display_width or lead_x <= 0 or lead_y >=display_hight or lead_y <= 0 : 
	gameOver = True  
 
lead_x += lead_x_change 
lead_y += lead_y_change 
 
gameDisplay.fill(white) 
pygame.draw.rect(gameDisplay,red,[randAppleX,randAppleY]) 
snake(block_size,snakelist )

pygame.display.update() 
if lead_x == randAppleX and lead_y == randAppleY:
	randAppleX = round (random.randrange(0, display_width- block_size)/10.0)*10.0  
	randAppleY = round (random.randrange(0, display_hight- block_size)/10.0)*10.0
    
clock.tick(FPS)

pygame.quit()#stops init 
quit()#stops code

gameLoop()

Python Fiddle

Python Cloud IDE