我正在尝试使用scrapy从维基百科中删除细节。我能够刮掉它但是我得到了一个非常混乱和糟糕的结果。因为我是python和scrapy的新手，所以我很难解决这个问题。
这是我的代码：
from scrapy.spider import BaseSpider
from scrapy.selector import HtmlXPathSelector
from wikipedia.items import WikipediaItem
class WikipediaSpider(BaseSpider):
name = "wiki"
allowed_domains = ["wikipedia.org"]
start_urls = ["http://en.wikipedia.org/wiki/Main_Page"]
def parse(self, response):
hxs = HtmlXPathSelector(response)
sites = hxs.select('//table[@id="mp-upper"]/tr')
items = []
for site in sites:
item = WikipediaItem()
item['title'] = site.select('.//a/text()').extract()
item['link'] = site.select('.//a/@href').extract()
item['details'] = site.select('.//p/text()').extract()
items.append(item)
return items
这就是结果：
2013-04-19 02:18:48+0800 [wiki] DEBUG: Scraped from <200 http://en.wikipedia.org/wiki/Main_Page>
{'details': [u' is a fungal species found in moist habitats in ',
u'. The species produces brown ',
u' with ',
u' of varying shapes up to 40 millimetres (1.6\xa0in) across, and tall, thin ',
u' up to 62 millimetres (2.4\xa0in) long, at the base of which is a large and well-defined "bulb". The stem varies in colour, with whitish, pale yellow-brown, pale red-brown, pale brown and grey-brown all observed. The species produces unusually shaped, irregular ',
u', each with a few thick protrusions. This feature helps differentiate it from other species that would otherwise be similar in appearance and ',
u'. It grows in ',
u' association with ',
u', and it is for this that the species is named. However, particular species favoured by the fungus are unclear and may include ',
u' and ',
u' taxa. The mushrooms grow from the ground, often among mosses or ',
u'. The species was first described in 2009, and within the genus ',
u', it is a part of the ',
u' ',
u'. The ',
u' ',
u' was collected from the shore of a lake near ',
u', Finland. The species has also been recorded in Sweden and, at
least in some areas, it is relatively common. (',
u')',
u'Recently featured: ',
u'\xa0\u2013 ',
u'\xa0\u2013 ',
u': ',
u' ',
u' ',
u'More anniversaries: ',
u' ',
u' '],
'link': [u'/wiki/File:Inocybe_saliceticola.jpg',
u'/wiki/Inocybe_saliceticola',
u'/wiki/Nordic_countries',
u'/wiki/Mushrooms',
u'/wiki/Pileus_(mycology)',
u'/wiki/Stipe_(mycology)',
u'/wiki/Spore',
u'/wiki/Habit_(biology)',
u'/wiki/Mycorrhizal',
u'/wiki/Willow',
u'/wiki/Beech',
u'/wiki/Alder',
u'/wiki/Detritus',
u'/wiki/Section_(botany)',
u'/wiki/Holotype',
u'/wiki/Nurmes',
u'/wiki/Inocybe_saliceticola',
u'/wiki/Thistle,_Utah',
u'/wiki/Be_Here_Now_(album)',
u'/wiki/Sumatran_rhinoceros',
u'/wiki/Wikipedia:Today%27s_featured_article/April_2013',
u'https://lists.wikimedia.org/mailman/listinfo/daily-article-l',
u'/wiki/Wikipedia:Featured_articles',
u'/wiki/Wikipedia:Recent_additions',
u'/wiki/File:Ezra_Meeker_1921_crop.jpg',
u'/wiki/Ezra_Meeker',
u'/wiki/Oregon_Trail',
u'/wiki/Bullock_cart',
u'/wiki/Italy_at_the_2009_Mediterranean_Games',
u'/wiki/2009_Mediterranean_Games_medal_table',
u'/wiki/Cossack_hetman',
u'/wiki/Ivan_Petrizhitsky-Kulaga',
u'/wiki/Cossacks',
u'/wiki/Fokus_(magazine)',
u'/wiki/Amir_Garrett',
u'/wiki/College_basketball',
u'/wiki/Fastball',
u'/wiki/Armenian_Genocide',
u'/wiki/Karin_dialect',
u'/wiki/Scottish_American',
u'/wiki/Daniel_Pennie_House',
u'/wiki/Wikipedia:Recent_additions',
u'/wiki/Wikipedia:Your_first_article',
u'/wiki/Template_talk:Did_you_know',
u'/wiki/Slang',
u'/wiki/Hammer',
u'/wiki/Church_(building)',
u'/wiki/Wikipedia:Today%27s_articles_for_improvement',
u'/wiki/File:2013_Boston_Marathon_aftermath_people.jpg',
u'/wiki/West_fertilizer_plant_explosion',
u'/wiki/West,_Texas',
u'/wiki/Texas',
u'/wiki/Moment_magnitude_scale',
u'/wiki/2013_Sistan_and_Baluchestan_earthquake',
u'/wiki/Sistan_and_Baluchestan_Province',
u'/wiki/15_April_2013_Iraq_attacks',
u'/wiki/Boston_Marathon_bombings',
u'/wiki/2013_Boston_Marathon',
u'/wiki/Death_and_state_funeral_of_Hugo_Ch%C3%A1vez',
u'/wiki/Nicol%C3%A1s_Maduro',
u'/wiki/Venezuelan_presidential_election,_2013',
u'/wiki/List_of_Presidents_of_Venezuela',
u'/wiki/Adam_Scott_(golfer)',
u'/wiki/2013_Masters_Tournament',
u'/wiki/Government_of_India',
u'/wiki/Bollywood',
u'/wiki/Pran',
u'/wiki/Dadasaheb_Phalke_Award',
u'/wiki/Deaths_in_2013',
u'/wiki/Colin_Davis',
u'/wiki/Maria_Tallchief',
u'/wiki/Jonathan_Winters',
u'//en.wikinews.org/wiki/Main_Page',
u'/wiki/Portal:Current_events',
u'/wiki/April_18',
u'/wiki/File:Stpetes.JPG',
u'/wiki/1506',
u'/wiki/St._Peter%27s_Basilica',
u'/wiki/Vatican_City',
u'/wiki/Old_St._Peter%27s_Basilica',
u'/wiki/1689',
u'/wiki/Militia_(United_States)',
u'/wiki/Boston',
u'/wiki/1689_Boston_revolt',
u'/wiki/Dominion_of_New_England',
u'/wiki/1923',
u'/wiki/New_York_Yankees',
u'/wiki/Major_League_Baseball',
u'/wiki/Yankee_Stadium_(1923)',
u'/wiki/1938',
u'/wiki/Superman',
u'/wiki/Jerry_Siegel',
u'/wiki/Joe_Shuster',
u'/wiki/Action_Comics_1',
u'/wiki/Superhero',
u'/wiki/Comic_book',
u'/wiki/1947',
u'/wiki/List_of_the_largest_artificial_non-nuclear_explosions',
u'/wiki/Royal_Navy',
u'/wiki/Tonne',
u'/wiki/Ammunition',
u'/wiki/Heligoland',
u'/wiki/1949',
u'/wiki/Republic_of_Ireland',
u'/wiki/Commonwealth_of_Nations',
u'/wiki/1996',
u'/wiki/1996_shelling_of_Qana',
u'/wiki/Qana',
u'/wiki/Operation_Grapes_of_Wrath',
u'/wiki/United_Nations_Interim_Force_in_Lebanon',
u'/wiki/April_17',
u'/wiki/April_18',
u'/wiki/April_19',
u'/wiki/Wikipedia:Selected_anniversaries/April',
u'https://lists.wikimedia.org/mailman/listinfo/daily-article-l',
u'/wiki/List_of_historical_anniversaries',
u'/wiki/Coordinated_Universal_Time',
u'//en.wikipedia.org/w/index.php?title=Main_Page&action=purge'],
'title': [u'Inocybe saliceticola',
u'Nordic countries',
u'mushrooms',
u'caps',
u'stems',
u'spores',
u'habit',
u'mycorrhizal',
u'willow',
u'beech',
u'alder',
u'detritus',
u'section',
u'holotype',
u'Nurmes',
u'Thistle, Utah',
u'Be Here Now',
u'Sumatran rhinoceros',
u'Archive'
u'List of historical anniversaries',
u'UTC',
u'Reload this page']}
答案 0 :(得分：2)
我无法访问你所做的同一页面，但你获得的结果可能是如此不稳定，因为维基百科文本充满了链接。执行site.select('.//p/text()')时，只选择直接位于节点<p>下的文本。这意味着子节点<a href=..>text</a>内的内容不会被删除。链接标签会分割结果，因此您最终得到一个奇怪的列表。
如果要检索可以使用的每个节点
contents = site.select('.//p/node()').extract()
item['details'] = ''.join(contents)
这样，您就可以拥有<p>标记内的所有内容（包括<a>标记）。如果您只想要没有链接标记的文本，则可以使用strip_html(item['details'])（实际上，contents = site.select('.//p//text()').extract()可能也可以使用，并且更加面向xpath。