can someone please help me. 
After I added the code 

            for eachSegment in snakeList[:-1]:
            if eachSegment == snakeHead:
            gameOver = True



it throws the game over error first
not the game. I looked over again and again but nothing :( 
Please Help! 


import pygame
import time
import random

pygame.init()

white = (255, 255, 255)
black = (0, 0, 0)
red = (255, 0, 0)
green = (0, 155, 0)

display_width = 800
display_height = 600

gameDisplay = pygame.display.set_mode((display_width, display_height))
pygame.display.set_caption('Snake')


clock = pygame.time.Clock()

block_size = 10
FPS = 30



font = pygame.font.SysFont(None, 25)

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

def message_to_screen(msg, color):
screen_text = font.render(msg, True, color)
gameDisplay.blit(screen_text, [display_width/2, display_height/2])

def gameLoop():

gameExit = False
gameOver = False

lead_x = display_width/2
lead_y = display_height/2

lead_x_change = 0
lead_y_change = 0

snakeList = []
snakeLength = 5

randAppleX = round(random.randrange(0, display_width-block_size)/10.0)*10.0
randAppleY = round(random.randrange(0, display_height-block_size)/10.0)*10.0

while not gameExit:

while gameOver == True:

gameDisplay.fill(white)
message_to_screen("Game Over, Press C to Play Again 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

if event.type == pygame.KEYDOWN:
if event.key == pygame.K_LEFT:
lead_x_change = -block_size
lead_y_change = 0
elif event.key == pygame.K_RIGHT:
lead_x_change = block_size
lead_y_change = 0

elif event.key == pygame.K_UP:
lead_y_change = -block_size
lead_x_change = 0
elif event.key == pygame.K_DOWN:
lead_y_change = block_size
lead_x_change = 0

if lead_x >= display_width or lead_x < 0 or lead_y >= display_height 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, block_size, block_size])

snakeHead = []
snakeHead.append(lead_x)
snakeHead.append(lead_y)
snakeList.append(snakeHead)

if len(snakeList) > snakeLength:
del snakeList[0]

for eachSegment in snakeList[:-1]:
if eachSegment == snakeHead:
gameOver = True


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_height-block_size)/10.0)*10.0
snakeLength += 1

clock.tick(FPS)

pygame.quit()
quit()

gameLoop()