text: import pygame
  from pygame.sprite import Sprite
  
  
  class Ship(Sprite):
  
      def __init__(self, ai_settings, screen):
          """Initialize the ship and set its starting position"""
          super().__init__()
          self.screen = screen
          self.ai_settings = ai_settings
  
          # Load the ship image and get its rect.
          self.image = pygame.image.load('images/ship.bmp')
          self.rect = self.image.get_rect()
          self.screen_rect = screen.get_rect()
  
          # Start each new ship at the bottom of the screen.
          self.rect.bottom = self.screen_rect.bottom
          self.rect.centerx = self.screen_rect.centerx
  
          # Store a decimal value for the ship's center.
          self.centerx = float(self.rect.centerx)
                                                                                                                  # self.centery = float(self.rect.centery)
          # Movement flags
          self.moving_right = False
          self.moving_left = False
          """self.moving_up = False
          self.moving_down = False"""
  
      def update(self):
          """Update the ship's position based on the movement flag."""
  
          # Update the ship's center value, not the rect.
          if self.moving_right and self.rect.right < self.screen_rect.right:
              self.centerx += self.ai_settings.ship_speed_factor
          if self.moving_left and self.rect.left > 0:
              self.centerx -= self.ai_settings.ship_speed_factor
  
          """if self.moving_up and self.rect.top > 0:
              self.centery -= self.ai_settings.ship_speed_factor
          if self.moving_down and self.rect.bottom < self.screen_rect.bottom:
              self.centery += self.ai_settings.ship_speed_factor"""
  
          # Update rect object from self.center
          self.rect.centerx = self.centerx
          # self.rect.centery = self.centery
  
      def blitme(self):
          """Draw the ship at its current location."""
          self.screen.blit(self.image, self.rect)
  
      def center_ship(self):
          """Center the ship on the screen."""
          self.centerx = self.screen_rect.centerx
  