300, 200の座標から 200x100のサイズの箱を書く
import pygame
from pygame.locals import *
screen = pygame.display.set_mode((600, 400))
def main():
while 1:
screen.fill((0,0,0))
pygame.draw.rect(screen, Color('lightskyblue3'), Rect(300,100,200,100))
pygame.display.update()
pygame.time.wait(500)
for event in pygame.event.get():
if event.type == pygame.QUIT:
pygame.quit()
quit()
pygame.init()
main()