Key Pressing System PyGame - python-3.x

Question

I'm making a basic pong game and want to make a system where a button press makes the paddle goes up or down. I'm fairly new to PyGame and here's my code so far.
import pygame, sys
from pygame.locals import*
def Pong():
pygame.init()
DISPLAY=pygame.display.set_mode((600,400),0,32)
pygame.display.set_caption("Pong")
BLACK=(0,0,0)
WHITE=(255,255,255)
RED=(255,0,0)
DISPLAY.fill(BLACK)
while True:
def P(b):
pygame.draw.rect(DISPLAY,WHITE,(50,b,50,10))
xx=150
P(xx)
for event in pygame.event.get():
if event.type==KEYUP and event.key==K_W:
P(xx+10)
xx=xx+10
pygame.display.update()
elif event.type==QUIT:
pygame.quit()
sys.exit()

Answer 1

Please read some tutorials and/or docs. This is really basic and if you don't get this right it will bite you later.
Anyway, here's how it could look:
import pygame
pygame.init()
DISPLAY = pygame.display.set_mode((600,400))
paddle = pygame.Rect(0, 0, 10, 50)
paddle.midleft = DISPLAY.get_rect().midleft
speed = 10
clock = pygame.time.Clock()
while True:
for event in pygame.event.get():
if event.type == pygame.QUIT:
raise SystemExit(0)
keystate = pygame.key.get_pressed()
dy = keystate[pygame.K_s] - keystate[pygame.K_w]
paddle.move_ip(0, dy * speed)
DISPLAY.fill(pygame.Color("black"))
pygame.draw.rect(DISPLAY, pygame.Color("white"), paddle)
pygame.display.update()
clock.tick(30)
That is ok for Pong but I still wouldn't write my game like this. So read some tutorials and maybe try CodeReview if you really want to improve your code.