爬蟲(chóng)文件：
import scrapy
from xtzx.items import XtzxItem

from scrapy.http import Request

class LessonSpider(scrapy.Spider):

name = 'lesson'
allowed_domains = ['xuetangx.com']
start_urls = ['http://www.xuetangx.com/courses?credential=0&page_type=0&cid=118&process=0&org=0&course_mode=0&page=2']

def parse(self, response):
    item=XtzxItem()
    item["title"]=response.xpath("http://div[@class='fl list_inner_right cf']/div[@class='coursename']/a/h2[@class='coursetitle']/text()").extract()
    #item["school"]=response.xpath("http://div[@class='fl name']/ul/li/span/text()").extract()
    #item["stu"]=response.xpath("http://div[@class='fl name] '/li/span[@class='ri-tag fl']/text()").extract()
    yield item
    

pipelines:

class XtzxPipeline(object):

def process_item(self, item, spider):
    print(item["title"][0])
    #print(item["school"][0])
    #print(item["stu"][0])
    return item

2018-04-28 14:43:09 [scrapy.utils.log] INFO: Scrapy 1.5.0 started (bot: xtzx)
2018-04-28 14:43:09 [scrapy.utils.log] INFO: Versions: lxml 4.2.1.0, libxml2 2.9.7, cssselect 1.0.3, parsel 1.4.0, w3lib 1.19.0, Twisted 17.9.0, Python 3.5.4 (v3.5.4:3f56838, Aug 8 2017, 02:17:05) [MSC v.1900 64 bit (AMD64)], pyOpenSSL 17.5.0 (OpenSSL 1.1.0h 27 Mar 2018), cryptography 2.2.2, Platform Windows-10-10.0.16299-SP0
2018-04-28 14:43:09 [scrapy.crawler] INFO: Overridden settings: {'NEWSPIDER_MODULE': 'xtzx.spiders', 'SPIDER_MODULES': ['xtzx.spiders'], 'BOT_NAME': 'xtzx'}
2018-04-28 14:43:09 [scrapy.middleware] INFO: Enabled extensions:
['scrapy.extensions.telnet.TelnetConsole',
'scrapy.extensions.corestats.CoreStats',
'scrapy.extensions.logstats.LogStats']
2018-04-28 14:43:09 [scrapy.middleware] INFO: Enabled downloader middlewares:
['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']
2018-04-28 14:43:09 [scrapy.middleware] INFO: Enabled spider middlewares:
['scrapy.spidermiddlewares.httperror.HttpErrorMiddleware',
'scrapy.spidermiddlewares.offsite.OffsiteMiddleware',
'scrapy.spidermiddlewares.referer.RefererMiddleware',
'scrapy.spidermiddlewares.urllength.UrlLengthMiddleware',
'scrapy.spidermiddlewares.depth.DepthMiddleware']
2018-04-28 14:43:09 [scrapy.middleware] INFO: Enabled item pipelines:
[]
2018-04-28 14:43:09 [scrapy.core.engine] INFO: Spider opened
2018-04-28 14:43:09 [scrapy.extensions.logstats] INFO: Crawled 0 pages (at 0 pages/min), scraped 0 items (at 0 items/min)
2018-04-28 14:43:09 [scrapy.extensions.telnet] DEBUG: Telnet console listening on 127.0.0.1:6023
2018-04-28 14:43:10 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://www.xuetangx.com/cours...;page_type=0&cid=118&process=0&org=0&course_mode=0&page=2> (referer: None)
2018-04-28 14:43:10 [scrapy.core.scraper] DEBUG: Scraped from <200 http://www.xuetangx.com/cours...;page_type=0&cid=118&process=0&org=0&course_mode=0&page=2>
下面部分就是要爬取的內(nèi)容，已經(jīng)得到了

{'title': ['會(huì)計(jì)學(xué)原理（2018春）',

       '貨幣金融學(xué)（自主模式）',
       '貨幣金融學(xué)（2018春）',
       '中國(guó)房地產(chǎn)發(fā)展之路(自主模式)',
       '中國(guó)房地產(chǎn)發(fā)展之路（2018春）',
       '創(chuàng)業(yè)102：你能為客戶做什么？（自主模式）',
       '創(chuàng)業(yè)102：你能為客戶做什么？（2018春）',
       '麥肯錫“全球領(lǐng)導(dǎo)力”（2018春）',
       '初級(jí)財(cái)務(wù)會(huì)計(jì)（自主模式）',
       '初級(jí)財(cái)務(wù)會(huì)計(jì)（2018春）']}

2018-04-28 14:43:10 [scrapy.core.engine] INFO: Closing spider (finished)
2018-04-28 14:43:10 [scrapy.statscollectors] INFO: Dumping Scrapy stats:
{'downloader/request_bytes': 292,
'downloader/request_count': 1,
'downloader/request_method_count/GET': 1,
'downloader/response_bytes': 27101,
'downloader/response_count': 1,
'downloader/response_status_count/200': 1,
'finish_reason': 'finished',
'finish_time': datetime.datetime(2018, 4, 28, 6, 43, 10, 470916),
'item_scraped_count': 1,
'log_count/DEBUG': 3,
'log_count/INFO': 7,
'response_received_count': 1,
'scheduler/dequeued': 1,
'scheduler/dequeued/memory': 1,
'scheduler/enqueued': 1,
'scheduler/enqueued/memory': 1,
'start_time': datetime.datetime(2018, 4, 28, 6, 43, 9, 860924)}
2018-04-28 14:43:10 [scrapy.core.engine] INFO: Spider closed (finished)

在cmd中執(zhí)行scrapy crawl lesson得到以上結(jié)果
但是執(zhí)行scrapy crawl lesson --nolog就沒(méi)有輸出了
另外title應(yīng)該是一個(gè)列表吧？
另外，我剛才也提了一個(gè)問(wèn)題，然后一個(gè)老師回答了，但是我這邊點(diǎn)采納沒(méi)有反應(yīng)，采納回答還有限制嗎？