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[英]scrapy response.xpath returns empty array on xml document with default namespace, while response.re works
[英]Xpath locates html element correctly in console but returns empty array when used in scrapy response
我使用Scrapy Framework創建了一個Webscraper,以從該網站獲取音樂會門票數據。 我已經能夠成功地抓取一些選擇器的數據,這些選擇器本質上只是html文本,但是其他一些選擇器正在收集任何內容。 當我嘗試從每張票中刮起演唱會日期時,盡管我使用的xpath在開發人員控制台中運行時都會返回所有正確的日期,但響應中仍返回一個空數組。 我在類定義中定義項目的方式有問題嗎? 任何幫助將不勝感激:
from scrapy.contrib.spiders import CrawlSpider
from scrapy.selector import HtmlXPathSelector
from scrapy.selector import Selector
from scrapy.contrib.loader import XPathItemLoader
from scrapy.contrib.loader.processor import Join, MapCompose
from concert_comparator.items import ComparatorItem
bandname = raw_input("Enter a bandname \n")
vs_url = "http://www.vividseats.com/concerts/" + bandname + "-tickets.html"
class MySpider(CrawlSpider):
handle_httpstatus_list = [416]
name = 'comparator'
allowed_domains = ["www.vividseats.com"]
start_urls = [vs_url]
#rules = (Rule(LinkExtractor(allow=('-tickets/.*', )), callback='parse_item'))
# item = ComparatorItem()
tickets_list_xpath = './/*[@itemtype="http://schema.org/Event"]'
item_fields = {
'eventName' : './/*[@class="productionsEvent"]/text()',
#'ticketPrice' : '//*[@class="eventTickets lastChild"]/div/div/@data-origin-price',
'eventLocation' : './/*[@class = "productionsVenue"]/span[@itemprop = "name"]/text()',
'ticketsLink' : './/a/@href',
#returns empty set
'eventDate' : './/*[@class = "productionsDateCol productionsDateCol sorting_3"]/div[@class = "productionsDate"]/text()',
'eventCity' : './/*[@class = "productionsVenue"]/span[@itemprop = "address"]/span[@itemprop = "addressLocality"]/text()',
'eventState' : './/*[@class = "productionsVenue"]/span[@itemprop = "address"]/span[@itemprop = "addressRegion"]/text()',
#returns empty set
'eventTime' : './/*[@class = "productionsDateCol productionsDateCol sorting_3"]/div[@class = "productionsTime"]/text()'
}
def parse(self, response):
selector = HtmlXPathSelector(response)
# iterate over tickets
for ticket in selector.select(self.tickets_list_xpath):
loader = XPathItemLoader(ComparatorItem(), selector=ticket)
# define loader
loader.default_input_processor = MapCompose(unicode.strip)
loader.default_output_processor = Join()
# iterate over fields and add xpaths to the loader
for field, xpath in self.item_fields.iteritems():
loader.add_xpath(field, xpath)
yield loader.load_item()
不確定原因,但經過反復試驗,我找到了要使用的正確xpath。 通過簡單地使用我嘗試提取文本的標記中的類賦值語句,我便可以為頁面上的所有票證刮取元素。
例如eventDate:'.//*[@class =“ productionsDate”] / text()'
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