import pygame
import sys

width,height=640,480

white = (255, 255, 255)
black = (0, 0, 0)
pos_x = 200
pos_y = 200


pygame.init()
pygame.display.set_caption("Simple PyGame Example")
screen = pygame.display.set_mode((width,height))

clock = pygame.time.Clock()
while True:
    clock.tick(15)

    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            sys.exit()

    key_event = pygame.key.get_pressed()
    if key_event[pygame.K_LEFT]:
        pos_x -= 10

    if key_event[pygame.K_RIGHT]:
        pos_x += 10

    if key_event[pygame.K_UP]:
        pos_y -= 10

    if key_event[pygame.K_DOWN]:
        pos_y += 10


    screen.fill(black)

    pygame.draw.circle(screen, white, (pos_x, pos_y), 20)


    pygame.display.update()