#!/usr/bin/python3

import pygame

s = 80
v = 5
w = 50
h = 300
d = 40

pygame.init()
screen = pygame.display.set_mode((1280, 780))
font = pygame.freetype.Font("font.ttf", s)
clock = pygame.time.Clock()
running = True
dt = 0

fps = 60

ball = {
	"pos": pygame.Vector2(screen.get_width() / 2, screen.get_height() / 2),
	"vel": pygame.Vector2(v, v)
}

p1_points = 0
p2_points = 0

player1 = pygame.Rect(0, screen.get_height()/2 - h/2, w, h)
player2 = pygame.Rect(screen.get_width() - w, screen.get_height()/2 - h/2, w, h)

while running:
  for event in pygame.event.get():
    if event.type == pygame.QUIT:
      running = False

  screen.fill("purple")

  keys = pygame.key.get_pressed()
  if keys[pygame.K_w]:
      player1.y -= abs(ball["vel"].x) * fps * dt
  if keys[pygame.K_s]:
      player1.y += abs(ball["vel"].x) * fps * dt
  if keys[pygame.K_UP]:
      player2.y -= abs(ball["vel"].x) * fps * dt
  if keys[pygame.K_DOWN]:
      player2.y += abs(ball["vel"].x) * fps * dt

  # Rechts uit het scherm
  if ball["pos"].x + d/2 >= screen.get_width():
    ball["pos"].x = screen.get_width() / 2
    ball["pos"].y = screen.get_height() / 2
    ball["vel"] = pygame.Vector2(-v, v)
    p1_points += 1

  # Links uit het scherm
  if ball["pos"].x <= d/2:
    ball["pos"].x = screen.get_width() / 2
    ball["pos"].y = screen.get_height() / 2
    ball["vel"] = pygame.Vector2(v, v)
    p2_points += 1

  if ball["pos"].y + d/2 >= screen.get_height():
    ball["vel"].y *= -1

  if ball["pos"].y <= d/2:
    ball["vel"].y *= -1

  if player1.collidepoint(ball["pos"]) or player2.collidepoint(ball["pos"]):
    ball["vel"].x *= -1.2

  ball["pos"].x += ball["vel"].x * fps * dt
  ball["pos"].y += ball["vel"].y * fps * dt

  pygame.draw.circle(screen, "white", ball["pos"], d)
  pygame.draw.rect(screen, "white", player1)
  pygame.draw.rect(screen, "white", player2)

  font.render_to(screen, (s, s), str(p1_points), (255, 255, 255))
  font.render_to(screen, (screen.get_width() - 2*s, s), str(p2_points), (255, 255, 255))

  pygame.display.flip()

  dt = clock.tick(fps) / 1000

pygame.quit()

Pong in 85 lines of Python :)