bullet.py

import pygame
import random
########################################################################
from pygame.sprite import Sprite
########################################################################

class Bullet(Sprite):
    """Class for game bullet"""
    def __init__(self, ai_game):
        """Action at the current position of the ship"""
        super().__init__()
        self.screen = ai_game.screen
        self.settings = ai_game.settings
        self.color = self.settings.bullet_color
        self.rect = pygame.Rect(0, 0, self.settings.bullet_width,
            self.settings.bullet_height)
        self.rect.midtop = ai_game.ship.rect.midtop
        self.y = float(self.rect.y)

    def update(self):
        """Bullet position update"""
        self.y -= self.settings.bullet_speed
        self.rect.y = self.y

    def draw_bullet(self):
        pygame.draw.rect(self.screen, self.color, self.rect)