screen.blit() function executing even after pygame.quit() is used - pygame

Question

I am making a basic pong game in pygame with a separate menu screen. I have figured out all the gameplay (physics of ball,score system etc.).However, when i quit the game no matter from the menu screen or from the main game loop, i get this error:pygame.error: display Surface quit. I have seen all the posts about this error on stackoverflow, as well as other websites. I understand that the error is occuring because even after the pygame.quit() function, the next screen.blit(player1,(player1x,player1y)) is being executed. Following is the my code :
import pygame
import random
pygame.init()
#screen
screenw = 1000
screenh = 600
screen = pygame.display.set_mode((screenw, screenh))
bg = pygame.image.load("bg.jpg")
dp = pygame.image.load("ping-pong.png")
pygame.display.set_caption("PONG")
pygame.display.set_icon(dp)
def main():
# score
font = pygame.font.Font('font.otf', 24)
winfont = pygame.font.Font('font.otf', 50)
score_value_p1 = 0
scorexp1 = 10
scoreyp1 = 0
score_value_p2 = 0
scorexp2 = screenw - 145
scoreyp2 = 0
#toss
toss = random.choice([-1,1])
#players
def initial_bars():
global player1,player1x,player1y,player1_change,player2,player2x,player2y,player2_change
player1 = pygame.image.load("danda.png")
player1 = pygame.transform.scale(player1,(25,128))
player1x = 10
player1y = 232
player1_change = 0
player2 = pygame.image.load("danda.png")
player2 = pygame.transform.scale(player1,(25,128))
player2x = 965
player2y = 232
player2_change = 0
#ball
def initial_ball():
global ball,ballx,bally,ballx_change,bally_change
ball = pygame.image.load("ball.png")
ballx = 484
bally = 284
ballx_change = 0.4*toss
bally_change = 0.0
initial_bars()
initial_ball()
global player1,player1x,player1y,player1_change,player2,player2x,player2y,player2_change,ball,ballx,bally,ballx_change,bally_change,running
#functions
def player1bar():
screen.blit(player1,(player1x,player1y))
def player2bar():
screen.blit(player2,(player2x,player2y))
def balll():
screen.blit(ball,(ballx,bally))
def show_score():
scorep1 = font.render("Score : " + str(score_value_p1), True, (255, 50, 50))
screen.blit(scorep1, (scorexp1 , scoreyp1))
scorep2 = font.render("Score : " + str(score_value_p2), True, (255, 50, 50))
screen.blit(scorep2, (scorexp2 , scoreyp2))
#game window
running = True
while running:
screen.fill((0, 0, 0))
pygame.draw.line(screen,(255,255,30),(499,0),(499,600), 10)
pygame.draw.circle(screen,(255,255,30),(500,300), 40, 10)
for event in pygame.event.get():
if event.type == pygame.QUIT:
running = False
pygame.quit()
# player1 movement
if event.type == pygame.KEYDOWN:
if event.key == pygame.K_s :
player1_change = 0.6
if event.key == pygame.K_w:
player1_change = -0.6
if event.type == pygame.KEYUP:
if event.key == pygame.K_s or event.key == pygame.K_w:
player1_change = 0
# player2 movement
if event.type == pygame.KEYDOWN:
if event.key == pygame.K_DOWN :
player2_change = 0.6
if event.key == pygame.K_UP:
player2_change = -0.6
if event.type == pygame.KEYUP:
if event.key == pygame.K_DOWN or event.key == pygame.K_UP:
player2_change = 0
player1y += player1_change
player2y += player2_change
# player1 boundary
if player1y <= 0:
player1y = 0
elif player1y >= 472:
player1y = 472
# player2 boundary
if player2y <= 0:
player2y = 0
elif player2y >= 472:
player2y = 472
#ball move
ballx += ballx_change
bally += bally_change
toss = random.choice([-1,1])
if ballx < 35 and ballx > 30 and (player1y == bally or (player1y < bally and player1y > bally - 128) or (player1y > bally and player1y < bally + 32)):
ballx_change *= -1
if ballx_change < 1:
ballx_change += 0.05
bally_change = ballx_change*toss
if ballx > 933 and ballx < 938 and (player2y == bally or (player2y < bally and player2y > bally - 128) or (player2y > bally and player2y < bally + 32)):
ballx_change *= -1
if ballx_change > -1:
ballx_change -= 0.05
bally_change = ballx_change*toss
# ball boundary
if bally < 0 or bally > screenh - 32:
bally_change *= -1
#score
if ballx > screenw:
score_value_p1 += 1
if ballx < -32:
score_value_p2 += 1
#respawn
if ballx > screenw or ballx < -32:
initial_ball()
initial_bars()
player1bar()
player2bar()
balll()
show_score()
#winner
if score_value_p1 == 5:
winner = winfont.render("The Winner is Player 1", True, (50, 255, 50))
winner_rect = winner.get_rect(center=(screenw/2, screenh/2))
pygame.draw.rect(screen, (0,0,0), pygame.Rect(winner_rect))
screen.blit(winner, winner_rect)
if score_value_p2 == 5:
winner = winfont.render("The Winner is Player 2", True, (50, 255, 50))
winner_rect = winner.get_rect(center=(screenw/2, screenh/2))
pygame.draw.rect(screen, (0,0,0), pygame.Rect(winner_rect))
screen.blit(winner, winner_rect)
pygame.display.update()
if score_value_p1 == 5 or score_value_p2 == 5:
pygame.time.delay(2000)
menu_screen()
if ballx == 484 and bally == 284:
pygame.time.delay(1250)
ballx_change = 0.4*toss
def menu_screen():
menufont = pygame.font.Font('font.otf', 50)
tipfont = pygame.font.Font('font.otf', 30)
running = True
while running:
screen.blit(bg,(0,0))
title = menufont.render("Multiplayer Pong", True, (255, 255, 20))
screen.blit(title, (220,70))
tip = tipfont.render("Click Anywhere to Play", True, (50, 255, 50))
screen.blit(tip, (275,500))
for event in pygame.event.get():
if event.type == pygame.QUIT:
running = False
pygame.quit()
if event.type == pygame.MOUSEBUTTONDOWN:
running = False
pygame.display.update()
main()
menu_screen()
I have tried methods like adding break,pygame.quit(),declaring running as a global variable. However, i have not been able to get rid of this problem. Can anyone please try o provide a solution for this problem. Following is the complete error i recieved :
Traceback (most recent call last):
File "c:\Users\jaism\OneDrive\Desktop\Codes\Minor Project CSE\main.py", line 208, in <module>
menu_screen()
File "c:\Users\jaism\OneDrive\Desktop\Codes\Minor Project CSE\main.py", line 206, in menu_screen
main()
File "c:\Users\jaism\OneDrive\Desktop\Codes\Minor Project CSE\main.py", line 158, in main
player1bar()
File "c:\Users\jaism\OneDrive\Desktop\Codes\Minor Project CSE\main.py", line 63, in player1bar
screen.blit(player1,(player1x,player1y))
pygame.error: display Surface quit

Answer 1

pygame.quit() uninitialize all pygame modules that have previously been initialized. So you can't call any pygame API function after pygame.quite(). pygame.quite() must be the very last pygame function called after the application loop:
def main():
# [...]
running = True
while running:
# [...]
for event in pygame.event.get():
if event.type == pygame.QUIT:
running = False
# pygame.quit() <-- DELETE
# [...]
def menu_screen():
# [...]
run_main = True
running = True
while running:
# [...]
for event in pygame.event.get():
if event.type == pygame.QUIT:
running = False
run_main = False
# pygame.quit() <-- DELETE
# [...]
if run_main:
main()
menu_screen()
pygame.quit() # <-- INSERT