老师，这是结果报的是NoneType: None，应该怎么办啊

2024-05-21 12:35:46 [scrapy.utils.log] INFO: Scrapy 2.11.2 started (bot: scrapy05)

2024-05-21 12:35:46 [scrapy.utils.log] INFO: Versions: lxml 5.2.2.0, libxml2 2.11.7, cssselect 1.2.0, parsel 1.9.1, w3lib 2.1.2, Twisted 24.3.0, Python 3.11.3 (tags/v3.11.3:f3909b8, Apr  4 2023, 23:49:59) [MSC v.1934 64 bit (AMD64)], pyOpenSSL 24.1.0 (OpenSSL 3.2.1 30 Jan 2024), cryptography 42.0.7, Platform Windows-10-10.0.22621-SP0

2024-05-21 12:35:46 [scrapy.addons] INFO: Enabled addons:

[]

2024-05-21 12:35:46 [asyncio] DEBUG: Using selector: SelectSelector

2024-05-21 12:35:46 [scrapy.utils.log] DEBUG: Using reactor: twisted.internet.asyncioreactor.AsyncioSelectorReactor

2024-05-21 12:35:46 [scrapy.utils.log] DEBUG: Using asyncio event loop: asyncio.windows_events._WindowsSelectorEventLoop

2024-05-21 12:35:46 [scrapy.extensions.telnet] INFO: Telnet Password: 9681eb48711cc975

2024-05-21 12:35:46 [scrapy.middleware] INFO: Enabled extensions:

['scrapy.extensions.corestats.CoreStats',

 'scrapy.extensions.telnet.TelnetConsole',

 'scrapy.extensions.logstats.LogStats']

2024-05-21 12:35:46 [scrapy.crawler] INFO: Overridden settings:

{'BOT_NAME': 'scrapy05',

 'FEED_EXPORT_ENCODING': 'utf-8',

 'NEWSPIDER_MODULE': 'scrapy05.spiders',

 'REQUEST_FINGERPRINTER_IMPLEMENTATION': '2.7',

 'SPIDER_MODULES': ['scrapy05.spiders'],

 'TWISTED_REACTOR': 'twisted.internet.asyncioreactor.AsyncioSelectorReactor',

 'USER_AGENT': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 '

               '(KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.36'}

2024-05-21 12:35:46 [scrapy.middleware] INFO: Enabled downloader middlewares:

['scrapy.downloadermiddlewares.offsite.OffsiteMiddleware',

 'scrapy.downloadermiddlewares.httpauth.HttpAuthMiddleware',

 'scrapy.downloadermiddlewares.downloadtimeout.DownloadTimeoutMiddleware',

 'scrapy.downloadermiddlewares.defaultheaders.DefaultHeadersMiddleware',

 'scrapy.downloadermiddlewares.useragent.UserAgentMiddleware',

 'scrapy.downloadermiddlewares.retry.RetryMiddleware',

 'scrapy.downloadermiddlewares.redirect.MetaRefreshMiddleware',

 'scrapy.downloadermiddlewares.httpcompression.HttpCompressionMiddleware',

 'scrapy.downloadermiddlewares.redirect.RedirectMiddleware',

 'scrapy.downloadermiddlewares.cookies.CookiesMiddleware',

 'scrapy.downloadermiddlewares.httpproxy.HttpProxyMiddleware',

 'scrapy.downloadermiddlewares.stats.DownloaderStats']

2024-05-21 12:35:46 [scrapy.middleware] INFO: Enabled spider middlewares:

['scrapy.spidermiddlewares.httperror.HttpErrorMiddleware',

 'scrapy.spidermiddlewares.referer.RefererMiddleware',

 'scrapy.spidermiddlewares.urllength.UrlLengthMiddleware',

 'scrapy.spidermiddlewares.depth.DepthMiddleware']

2024-05-21 12:35:46 [scrapy.middleware] INFO: Enabled item pipelines:

['scrapy.pipelines.images.ImagesPipeline']

2024-05-21 12:35:46 [scrapy.core.engine] INFO: Spider opened

2024-05-21 12:35:46 [scrapy.extensions.logstats] INFO: Crawled 0 pages (at 0 pages/min), scraped 0 items (at 0 items/min)

2024-05-21 12:35:46 [scrapy.extensions.telnet] INFO: Telnet console listening on 127.0.0.1:6023

2024-05-21 12:35:46 [scrapy.core.engine] DEBUG: Crawled (200) <GET https://desk.zol.com.cn/bizhi/9812_118227_2.html> (referer: None)

2024-05-21 12:35:46 [scrapy.downloadermiddlewares.offsite] DEBUG: Filtered offsite request to 'desk-fd.zol-img.com.cn': <GET https://desk-fd.zol-img.com.cn/t_s960x600c5/g6/M00/0F/09/ChMkKWF4tn6IeIGwAD5r3l1JSDcAAU-5QFAFu4APmv2924.jpg>

2024-05-21 12:35:46 [scrapy.pipelines.media] ERROR: [Failure instance: Traceback: <class 'scrapy.pipelines.files.FileException'>:

D:\python_env\spider3_env\Lib\site-packages\twisted\internet\defer.py:536:addCallbacks      

D:\python_env\spider3_env\Lib\site-packages\twisted\internet\defer.py:1078:_runCallbacks    

D:\python_env\spider3_env\Lib\site-packages\scrapy\pipelines\media.py:197:_check_media_to_download

D:\python_env\spider3_env\Lib\site-packages\twisted\internet\defer.py:536:addCallbacks      

--- <exception caught here> ---

D:\python_env\spider3_env\Lib\site-packages\twisted\internet\defer.py:1078:_runCallbacks    

D:\python_env\spider3_env\Lib\site-packages\scrapy\pipelines\files.py:459:media_failed      

]

NoneType: None

2024-05-21 12:35:46 [scrapy.core.scraper] DEBUG: Scraped from <200 https://desk.zol.com.cn/bizhi/9812_118227_2.html>

{'image_urls': ['https://desk-fd.zol-img.com.cn/t_s960x600c5/g6/M00/0F/09/ChMkKWF4tn6IeIGwAD5r3l1JSDcAAU-5QFAFu4APmv2924.jpg'], 'images': []}

2024-05-21 12:35:46 [scrapy.core.engine] INFO: Closing spider (finished)

2024-05-21 12:35:46 [scrapy.statscollectors] INFO: Dumping Scrapy stats:

{'downloader/exception_count': 1,

 'downloader/exception_type_count/scrapy.exceptions.IgnoreRequest': 1,

 'downloader/request_bytes': 316,

 'downloader/request_count': 1,

 'downloader/request_method_count/GET': 1,

 'downloader/response_bytes': 9739,

 'downloader/response_count': 1,

 'downloader/response_status_count/200': 1,

 'elapsed_time_seconds': 0.367081,

 'finish_reason': 'finished',

 'finish_time': datetime.datetime(2024, 5, 21, 4, 35, 46, 984841, tzinfo=datetime.timezone.utc),

 'httpcompression/response_bytes': 33794,

 'httpcompression/response_count': 1,

 'item_scraped_count': 1,

 'log_count/DEBUG': 6,

 'log_count/ERROR': 1,

 'log_count/INFO': 10,

 'offsite/domains': 1,

 'offsite/filtered': 1,

 'response_received_count': 1,

 'scheduler/dequeued': 1,

 'scheduler/dequeued/memory': 1,

 'scheduler/enqueued': 1,

 'scheduler/enqueued/memory': 1,

 'start_time': datetime.datetime(2024, 5, 21, 4, 35, 46, 617760, tzinfo=datetime.timezone.utc)}

2024-05-21 12:35:46 [scrapy.core.engine] INFO: Spider closed (finished)

或者是用？但是必须加上数字，这种方法方法，参数列表的，入参顺序必须与  @Query注解当中标注的顺序相同

老师，浅拷贝是不是，增加b除了复制a里的数据，b内部发生了变化，也同样会给a拷贝b内部的数据。

而深拷贝b发生了变化后，a不发生任何变化。

老师这是怎么回事，英文可以正常显示，中文就会乱码

字符串由字母数字下划线组成，123asd@#$这个算什么？

清空cookie就可以重新访问，只能访问两个商品详情，第三个就报错，清空cookie又可以重新访问

清空cookie就可以访问，只能访问两个商品详情页面

老师 如何判断某一个参数此时达到最优呢？

为什么我的运行图全是黑色，没有线，圆呢

import java.awt.Graphics;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.swing.JFrame;

/**
 * 飞机游戏的主窗口
 * @author 阎冬
 *
 */
public class MyGameFrame extends JFrame {
	@Override
	public void paint(Graphics g) {//自动被调用。g相当于一只画笔
		
		g.drawLine(100,100,300,300);
		g.drawRect(100,100,300,300);
		g.drawOval(100,100,300,300);
		
	}
	/**
	 * 初始化窗口
	 */
	public void launchFrame() {
		this.setTitle("阎冬_作品");
		this.setVisible(true);
		this.setSize(500,500);
		this.setLocation(300,300);
		
		this.addWindowListener(new WindowAdapter() {
			public void windowClosing(WindowEvent e) {
				System.exit(0);
				
			}
		});
		
	}
	
	public static void main(String[] args) {
		MyGameFrame f = new MyGameFrame();
		f.launchFrame();
		
	}

}

已经安装成功了，也显示了Requirement，就是用不了

老师，有没有数据库导入文件，想直接在本地看看效果

哪里错了？那个alias这个怎么用啊？？？？？？？？？？

老师我这个为什么还是乱码呢

这里为什么要重写hashCode()和equal()这两个方法？