I've been working on this pong game for a while now but I can't get it to work. Right now it only has one paddle and is played vertically but I need it to be like the classic pong and play horizontally. Here's the code...

import pygame, sys

class MyBallClass(pygame.sprite.Sprite):
def __init__(self, image_file, speed, location):
pygame.sprite.Sprite.__init__(self) #call Sprite initializer
self.image = pygame.image.load(image_file)
self.rect = self.image.get_rect()
self.rect.left, self.rect.top = location
self.speed = speed

def move(self):
global points, score_text
self.rect = self.rect.move(self.speed)

if self.rect.left < 0 or self.rect.right > width:
self.speed[0] = -self.speed[0]
if self.rect.top < 0 or self.rect.bottom > height:
self.speed[1] = -self.speed[1]

class MyPaddleClass(pygame.sprite.Sprite):
def __init__(self, location):
pygame.sprite.Sprite.__init__(self) #call Sprite initializer
image_surface = pygame.surface.Surface([100, 20])
image_surface.fill([0,0,0])
self.image = image_surface.convert()
self.rect = self.image.get_rect()
self.rect.left, self.rect.top = location

pygame.init()
screen = pygame.display.set_mode([640,480])
clock = pygame.time.Clock()
myBall = MyBallClass('wackyball.bmp', [10,5], [50, 50])
ballGroup = pygame.sprite.Group(myBall)
paddle = MyPaddleClass([270, 400])
lives = 3
points = 0

font = pygame.font.Font(None, 50)
score_text = font.render(str(points), 1, (0, 0, 0))
textpos = [10, 10]
done = False

while 1:
clock.tick(30)
screen.fill([255, 255, 255])
for event in pygame.event.get():
if event.type == pygame.QUIT:
sys.exit()
elif event.type == pygame.MOUSEMOTION:
paddle.rect.centerx = event.pos[0]

if pygame.sprite.spritecollide(paddle, ballGroup, False):
myBall.speed[1] = -myBall.speed[1]
myBall.move()

if not done:
screen.blit(myBall.image, myBall.rect)
screen.blit(paddle.image, paddle.rect)
screen.blit(score_text, textpos)
for i in range (lives):
width = screen.get_width()
screen.blit(myBall.image, [width - 40 * i, 20])
pygame.display.flip()

if myBall.rect.top >= screen.get_rect().bottom:
# lose a life if the ball hits the bottom
lives = lives - 1
if lives == 0:
final_text1 = "Game Over"
final_text2 = "Your final score is: " + str(points)
ft1_font = pygame.font.Font(None, 70)
ft1_surf = font.render(final_text1, 1, (0, 0, 0))
ft2_font = pygame.font.Font(None, 50)
ft2_surf = font.render(final_text2, 1, (0, 0, 0))
screen.blit(ft1_surf, [screen.get_width()/2 - \
ft1_surf.get_width()/2, 100])
screen.blit(ft2_surf, [screen.get_width()/2 - \
ft2_surf.get_width()/2, 200])
pygame.display.flip()
done = True
else: #wait 2 seconds, then start the next ball
pygame.time.delay(2000)
myBall.rect.topleft = [50, 50]