2 days learning Python 3

[Donny]

Thank you to you all for the helpfull replies. I have managed to resolve this now.
ypos=50
pygame.draw.circle(screen,(0,255,0),(xpos,ypos),20)

import pygame, sys
from pygame.locals import *
pygame.init()
pygame.display.set_caption("first program")
screen = pygame.display.set_mode((640,480))
xpos = 50
ypos = 50
clock = pygame.time.Clock()
while 1:
	clock.tick(60)
	for event in pygame.event.get():
		if event.type == pygame.QUIT:
			sys.exit()
	pressed_keys = pygame.key.get_pressed()
	if pressed_keys[K_RIGHT]:
		xpos += 1
	if pressed_keys[K_LEFT]:
		xpos -= 1
	if pressed_keys[K_UP]:
		ypos -= 1
	if pressed_keys[K_DOWN]:
		ypos += 1

	screen.fill((255,255,255))
	pygame.draw.circle(screen,(0,255,0),(xpos,ypos),20)
	
	pygame.display.update()