AttributeError: 'builtin_function_or_method' 对象没有属性 'midbottom'

Question

AttributeError: 'builtin_function_or_method' 对象没有属性 'midbottom' 请帮帮我。

import pygame

class Ship:
  """A class to manage the ship."""
  
  def __init__(self,ai_game):
    """Initialize the ship and set its starting position."""
    self.screen = ai_game.screen
    self.screen_rect = ai_game.screen.get_rect()
    
    #Load the ship image and get its rect.
    self.image = pygame.image.load('images/ship.bmp')
    self.rect = self.image.get_rect
    
    #Start each new ship at the bottom center of the screen.
    self.rect.midbottom = self.screen_rect.midbottom
    
  def blitme(self):
    """Draw the ship at it's current location."""
    self.screen.blit(self.image,self.rect)