alien.py

import pygame
from pygame.sprite import Sprite

class Alien(Sprite):
  def __init__(self, ai_game, image_path):
    super().__init__()
    self.screen = ai_game.screen
    self.settings = ai_game.settings
    
    self.image_path = image_path
    self.image = pygame.image.load(image_path)

    self.life = 2

    scaler = 5
    self.image = pygame.transform.scale(self.image, (13*scaler,8*scaler))
    self.rect = self.image.get_rect()

    self.rect.x = self.rect.width
    self.rect.y = self.rect.height

    self.x = float(self.rect.x)


  def update(self):
    self.x += self.settings.alien_speed * self.settings.fleet_direction
    self.rect.x = self.x

  def update_life(self):
    if self.life == 1:
      var = pygame.PixelArray(self.image)
      var.replace((255, 126, 0), (173, 87, 1))
      del var
    elif self.life == 0:
      self.kill()

  def check_edges(self):
    screen_rect = self.screen.get_rect()
    return (self.rect.right >= screen_rect.right) or (self.rect.left <= 0)