bullet.py

import pygame
from pygame.sprite import Sprite


class Bullet(Sprite):
    def __init__(self, ai_game):
        super().__init__()
        self.screen = ai_game.screen
        self.settings = ai_game.settings
        self.color = self.settings.bullet_color

        # Create a bullet rect at (0,0) and then set correct position
        self.rect = pygame.Rect(0,0, self.settings.bullet_width, self.settings.bullet_height)
        self.rect.midtop = ai_game.ship.rect.midtop
        # store bullet's position as a float
        self.y = float(self.rect.y)

    def update(self):
        # update the exact position of the bullet
        self.y -= self.settings.bullet_speed
        # update the rect pos
        self.rect.y = self.y
    
    def draw_bullet(self):
        pygame.draw.rect(self.screen, self.color, self.rect)