sample animated rectangle

sample_animation.py

import random, os.path
import pygame
from pygame.locals import *
SCREENRECT     = Rect(0, 0, 370, 720)

class Ball:
    def __init__(self):
        self.location = (50,50,50,50)
        self.y = 50
    def update(self):
        self.y = self.y + 1
        print(self.y)
        self.location = (self.location[0],self.y,self.location[2],self.location[3])
        print(self.location)
    def draw(self,s):
        pygame.draw.rect(s,(255,255,255), self.location)
def main(winstyle = 0):
    # Initialize pygame
    pygame.init()
    bestdepth = pygame.display.mode_ok(SCREENRECT.size, winstyle, 32)
    screen = pygame.display.set_mode(SCREENRECT.size, winstyle, bestdepth)
    background = pygame.Surface(SCREENRECT.size)
    pygame.display.flip()
    clock = pygame.time.Clock()
    b = Ball()
    while True:
        for event in pygame.event.get():
            if event.type == QUIT or \
                (event.type == KEYDOWN and event.key == K_ESCAPE):
                    return
        pygame.display.update()
        #all.clear(screen,background)
        screen.fill((0,0,0))
        b.update()
        #b.clear()
        b.draw(screen)
        clock.tick(40)

if __name__ == '__main__': main()