Python Crash Course项目：对象没有属性

Question

我正在尝试从Python Crash Course进行项目，并且在项目中间出现此错误，我无法弄清楚为什么，我有Alien_invasion.py，settings.py和ship.py文件，它们是：

这是主文件Alien_invasion.py

import sys
import pygame
from settings import Settings
from ship import Ship

def run_game():
    pygame.init()
    ai_settings = Settings()
    screen = pygame.display.set_mode((ai_settings.screen_width, 
    ai_settings.screen_height))
    pygame.display.set_caption("Alien Invasion")

    ship = Ship(screen)

    bg_color = (230, 230, 230)

    while True:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                sys.exit()

        screen.fill(ai_settings.bg_color)
        ship.blitme()

        pygame.display.flip()

run_game()

这是settings.py

class Settings():

    def __init__(self):

            self.screen_width = 1200
            self.screen_height = 600
            self.bg_color = (230, 230, 230)

这是ship.py

import pygame

class Ship():
    def __init__(self, screen):
        self.screen = screen

        self.image = pygame.image.load('images/ship.bmp')
        self.rect = self.image.get_rect()
        self.screen_rect = screen.get_rect()

        self.rect.centerx = self.screen_rect.centerx
        self.rect.bottom = self.screen_rect.bottom

        def blitme(self):
            self.screen.blit(self.image, self.rect)

它说：

Traceback (most recent call last):
  File "alien_invasion.py", line 26, in <module>
    run_game()
  File "alien_invasion.py", line 22, in run_game
    ship.blitme()
AttributeError: 'Ship' object has no attribute 'blitme'

Answer 1

问题是您将blitme函数嵌套在ship.py的init中。 该选项卡的功能与init一致 ，您将可以引用blitme（）。

import pygame

class Ship():
    def __init__(self, screen):
        self.screen = screen

        self.image = pygame.image.load('images/ship.bmp')
        self.rect = self.image.get_rect()
        self.screen_rect = screen.get_rect()

        self.rect.centerx = self.screen_rect.centerx
        self.rect.bottom = self.screen_rect.bottom

    def blitme(self):
        self.screen.blit(self.image, self.rect)