PONG

import pygame
import sys, time, random
pygame.init()
pygame.mixer.init()
x = 50
y = 50
y1 = 0
y2 = 0
pSpeed = 6
speed = 5
aiSpeed = 5
score = 0
aiScore = 0
windowSize = pygame.display.Info()
f = 1
flag = True
screen = pygame.display.set_mode((windowSize.current_w, windowSize.current_h), pygame.FULLSCREEN)
ballHit = pygame.mixer.Sound("ballHit.wav")
ballBounce =  pygame.mixer.Sound("ballBounce.wav")
myriadProFont = pygame.font.SysFont("Myriad Pro", 48)
directionX = 1
directionY = 1
clock = pygame.time.Clock()
pygame.key.set_repeat(1, 10)
pygame.mouse.set_visible(0)
while flag:
    clock.tick(100)
    scoreCount = myriadProFont.render(str(score), 1, (255, 255, 255), (0, 0, 0))
    aiScoreCount = myriadProFont.render(str(aiScore), 1, (255, 255, 255), (0, 0, 0))
    keystate = pygame.key.get_pressed()
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            flag = False
    if y2 < y and y2 <= windowSize.current_h - 80:
        y2 += aiSpeed
    if y < y2 and y2 >= 0:
        y2 -= aiSpeed
    if keystate[pygame.K_w] and y1 >= 0:
        y1 -= pSpeed
    if keystate[pygame.K_s] and y1 <= windowSize.current_h - 80:
        y1 += pSpeed
    if keystate[pygame.K_r] and speed == 0:
        x = 50
        y = 50
        y1 = 0
        y2 = 0
        score = 0
        f = 1
        flag = True
        speed = 5
        directionX = 1
        directionY = 1
        aiScore = 0
    if keystate[pygame.K_e] and speed == 0:
        flag = False
    screen.fill((0, 0, 0))
    pygame.draw.rect(screen, (255, 255, 255), (screen.get_size()[0] / 2 - 5/2, 0, 5, windowSize.current_w))
    pygame.draw.rect(screen, (255, 0, 0), (x, y, 10, 10))
    pygame.draw.rect(screen, (255, 255, 255), (0, y1, 10, 80))
    pygame.draw.rect(screen, (255, 255, 255), (windowSize.current_w - 10, y2 - 30, 10, 80))

    size = (20, 20)
    x += speed * directionX
    y += speed * directionY
    if x == 10 and  y > y1 and y < y1 + 80:
        directionX *= -1
        score += 1
        ballHit.play()
    if x < 0:
        screen.fill((0, 0, 0))
        finalScore = myriadProFont.render("Final Score: " + str(score), 1, (255, 255, 255), (0, 0, 0))
        retry = myriadProFont.render("Press 'r' to retry", 1, (255, 255, 255), (0, 0, 0))
        end = myriadProFont.render("Press 'e' to exit", 1, (255, 255, 255), (0, 0, 0))
        screen.blit(finalScore, (screen.get_size()[0] / 2 - finalScore.get_size()[0] / 2, 200))
        screen.blit(retry, (screen.get_size()[0] / 2 - retry.get_size()[0] / 2, 250))
        screen.blit(end, (screen.get_size()[0] / 2 - end.get_size()[0] / 2, 300))
        speed = 0
    if x >= windowSize.current_w - 10:
        directionX *= -1
        aiScore += 1
        ballHit.play()

    if y + size[1] > windowSize.current_h or y <= 0:
        directionY *= -1
        ballBounce.play()
    screen.blit(scoreCount, (screen.get_size()[0] / 2 - scoreCount.get_size()[0] / 2-20, 0))
    screen.blit(aiScoreCount, (screen.get_size()[0] / 2 - aiScoreCount.get_size()[0] / 2+20, 0))
    pygame.display.update()
pygame.quit()