bullet.py

import pygame

from pygame.sprite import Sprite

class Bullet(Sprite):

    def __init__(self,ai_settings,screen,ship):


        super(Bullet,self).__init__()
        self.screen=screen

        self.rect = pygame.Rect(0,0,ai_settings.bullet_width,ai_settings.bullet_height)

        self.rect.centerx=ship.rect.centerx
        self.rect.top=ship.rect.top

        self.y=float(self.rect.y)

        self.color=ai_settings.bullet_color
        self.speed_factor = ai_settings.bullet_speed_factor


    def update(self):
        self.y -=self.speed_factor
        self.rect.y=self.y

    def draw_bullet(self):

        pygame.draw.rect(self.screen,self.color,self.rect)