import pygame
from pygame.locals import *

w_size = 400
h_size = 400
screen = pygame.display.set_mode((w_size, h_size), DOUBLEBUF)

blue_color = (0, 0, 255)
black_color = (0, 0, 0)
p_x = 10
p_y = 200
radius = 20

running = True
while running:
	for event in pygame.event.get():
		increment = False

		if event.type == pygame.QUIT:
			running = False
		if event.type == KEYDOWN:
			if event.key == K_RIGHT:
				increment = True

		if increment:
			p_x = p_x + 1

		position = [p_x, p_y]

		screen.fill(black_color)
		pygame.draw.circle(screen, blue_color, position, radius)
		pygame.display.flip()

pygame.quit()