python - Adding a falling object -

# import pygame library python import pygame,sys  #this next line imports pygame sound system pygame.mixer.init() # loads sound sound = pygame.mixer.sound("c:/music/pygamenew/music2/jurassic_park_-_quot_main_theme_quot_john_williams.wav") roar = pygame.mixer.sound("c:/music/pygamenew/music2/dinosaur roar-soundbible.com-605392672.wav") # allows play song have loaded sound.play()  #this allows grab inputs keyboard or mouse presses pygame.locals import *  # line limits number of frames (60) # if computer speeds faster, still able play # helps prevent burning phone battery clock = pygame.time.clock()  #this initiates pygame pygame.init()  #set colors black = (0,0,0) white = (255,255,255) red = (255,0,0) green = (0,255,0) blue = (0,0, 255)  #creating size of our game screen size = width, height = 700,700 black = 0,0,0 screen = pygame.display.set_mode((800,600))   # set title of window pygame.display.set_caption('dinosaur madness')  pygame.mouse.set_visible(0) #makes mouse invisible on screen  # adding image dinosaur = pygame.image.load("c:/music/img_buddy1.png") dinosaur = pygame.transform.scale(dinosaur,(75,75))   dinosaur.set_colorkey(white) dinosaur_top=screen.get_height() - dinosaur.get_height() dinosaur_left=screen.get_width()/2 - dinosaur.get_width()/2 screen.blit(dinosaur,(dinosaur_left,dinosaur_top)) shoot = pygame.image.load("c:/music/animated-fire.gif") shoot = pygame.transform.scale(shoot,(20,20)) shoot.set_colorkey(white) shoot_y = 0  while true:     clock.tick(60)     screen.fill((blue))  #clears out screen each loop       x,y = pygame.mouse.get_pos()     screen.blit(dinosaur,(x-dinosaur.get_width()/2, dinosaur_top))      event in pygame.event.get():         if event.type==pygame.quit:             sys.exit()         elif event.type == keydown , event.key == k_escape:             sys.exit()         elif event.type == keydown , event.key == k_q:             sys.exit()         #this allows user end game         #by clicking on x @ top, escape, or q         elif event.type ==mousebuttondown:             roar.play() # when mouse button pressed, roar sound play             shoot_y = 520             shoot_x = x          elif event.type == keydown , event.key==k_space:             pygame.image.save(screen,"screenshot.png")             #this save screen shots of our screen file        if shoot_y > 0:         screen.blit(shoot,(shoot_x,shoot_y))         shoot_y -= 10     pygame.display.update() 

i want add falling ice cubes. object dinosaur shoot them before hits bottom. if hits bottom, player loses. how go this. new pygame. want add code , not sure how it.