import pygame

class Bullet (pygame.sprite.Sprite):
  def __init__(self, screen, gun):
    self.screen = screen
    super(Bullet, self).__init__()
    self.rect=pygame.Rect(0,0,4,12)
    self.rect.centerx = gun.rect.centerx
    self.rect.top = gun.rect.top +18
    self.color = 0,0,0
    self.speed = 1
    self.rect.y
  def update(self):  
     self.rect.y -= self.speed
  def draw_bullet(self):
     pygame.draw.rect(self.screen, self.color, self.rect)