Я прочитал все темы, используя scrapy для страниц AJAX и установленный веб-сервер selenium, чтобы упростить задачу, мой паук может частично сканировать, но не может получить какие-либо данные в мои объекты.Scrapy with Selenium crawling, но не соскабливание
Мои цели:
- Crawl от this page к this page
Scrape каждый пункт (пост) 'ы:
author_name (xpath:/html/body/div[8]/div/div[1]/div[3]/div[3]/ul/li[2]/div[2]/span[2]/ul/li[3]/a/text()) author_page_url (xpath:/html/body/div[8]/div/div[1]/div[3]/div[3]/ul/li[2]/div[2]/span[2]/ul/li[3]/a/@href) post_title (xpath://a[@class="title_txt"]) post_page_url (xpath://a[@class="title_txt"]/@href) post_text (xpath on a separate post page: //div[@id="a_NMContent/text()")
Это моя обезьяна код (так как я я только делаю первые шаги на Python в качестве стремящегося ученика по обработке естественного языка, который в прошлом занимался лингвистикой):
import scrapy
import time
from selenium import webdriver
from scrapy.contrib.linkextractors.lxmlhtml import LxmlLinkExtractor
from scrapy.contrib.spiders import CrawlSpider, Rule
from scrapy.selector import XPathSelector
class ItalkiSpider(CrawlSpider):
name = "italki"
allowed_domains = ['italki.com']
start_urls = ['http://www.italki.com/entries/korean']
# not sure if the rule is set correctly
rules = (Rule(LxmlLinkExtractor(allow="\entry"), callback = "parse_post", follow = True),)
def __init__(self):
self.driver = webdriver.Firefox()
def parse(self, response):
# adding necessary search parameters to the URL
self.driver.get(response.url+"#language=korean&author-language=russian&marks-min=-5&sort=1&page=1")
# pressing the "Show More" button at the bottom of the search results page to show the next 15 posts, when all results are loaded to the page, the button disappears
more_btn = self.driver.find_element_by_xpath('//a[@id="a_show_more"]')
while more_btn:
more_btn.click()
# sometimes waiting for 5 sec made spider close prematurely so keeping it long in case the server is slow
time.sleep(10)
# here is where the problem begins, I am making a list of links to all the posts on the big page, but I am afraid links will contain only the first link, because selenium doesn't do the multiple selection as one would expect from this xpath...how can I grab all the links and put them in the links list (and should I?)
links=self.driver.find_elements_by_xpath('/html/body/div[8]/div/div[1]/div[3]/div[3]/ul/li/div[2]/a')
for link in links:
link.click()
time.sleep(3)
# this is the function for parsing individual posts, called back by the *parse* method as specified in the rule of the spider; if it is correct, it should have saved at least one post into an item... I don't really understand how and where this callback function gets the response from the new page (the page of the post in this case)...is it automatically loaded to drive and then passed on to the callback function as soon as selenium has clicked on the link (link.click())? or is it all total nonsense...
def parse_post(self, response):
hxs = Selector(response)
item = ItalkiItem()
item["post_item"] = hxs.xpath('//div [@id="a_NMContent"]/text()').extract()
return item
спасибо, но, к сожалению, я теперь получить (интересно, что я сделал неправильно) рейз TypeError ('URL запроса должен быть Обл или Юникода, получили% s' % тип (URL) .__ name__) exceptions.TypeError : Запрос url должен быть str или unicode, получен список: –
@YuryKim конечно, исправлено. – alecxe