我是scrapy的新手我正在尝试为了学习目的而刮掉黄页一切正常,但我想要电子邮件地址,但要做到这一点我需要访问解析内部提取的链接并用另一个parse_email函数解析它但它没有炒锅。
我的意思是我测试了它运行的parse_email函数,但它不能在主解析函数内部工作,我希望parse_email函数获取链接的源,所以我使用回调调用parse_email函数但它只返回像这些<GET https://www.yellowpages.com/los-angeles-ca/mip/palm-tree-la-7254813?lid=7254813>
这样的链接应该返回电子邮件,因为某些原因parse_email函数无效,只是在不打开页面的情况下返回链接
这里是我评论部分的代码
import scrapy
import requests
from urlparse import urljoin
scrapy.optional_features.remove('boto')
class YellowSpider(scrapy.Spider):
name = 'yellow spider'
start_urls = ['https://www.yellowpages.com/search?search_terms=restaurant&geo_location_terms=Los+Angeles%2C+CA']
def parse(self, response):
SET_SELECTOR = '.info'
for brickset in response.css(SET_SELECTOR):
NAME_SELECTOR = 'h3 a ::text'
ADDRESS_SELECTOR = '.adr ::text'
PHONE = '.phone.primary ::text'
WEBSITE = '.links a ::attr(href)'
#Getiing the link of the page that has the email usiing this selector
EMAIL_SELECTOR = 'h3 a ::attr(href)'
#extracting the link
email = brickset.css(EMAIL_SELECTOR).extract_first()
#joining and making complete url
url = urljoin(response.url, brickset.css('h3 a ::attr(href)').extract_first())
yield {
'name': brickset.css(NAME_SELECTOR).extract_first(),
'address': brickset.css(ADDRESS_SELECTOR).extract_first(),
'phone': brickset.css(PHONE).extract_first(),
'website': brickset.css(WEBSITE).extract_first(),
#ONLY Returning Link of the page not calling the function
'email': scrapy.Request(url, callback=self.parse_email),
}
NEXT_PAGE_SELECTOR = '.pagination ul a ::attr(href)'
next_page = response.css(NEXT_PAGE_SELECTOR).extract()[-1]
if next_page:
yield scrapy.Request(
response.urljoin(next_page),
callback=self.parse
)
def parse_email(self, response):
#xpath for the email address in the nested page
EMAIL_SELECTOR = '//a[@class="email-business"]/@href'
#returning the extracted email WORKS XPATH WORKS I CHECKED BUT FUNCTION NOT CALLING FOR SOME REASON
yield {
'email': response.xpath(EMAIL_SELECTOR).extract_first().replace('mailto:', '')
}
我不知道我做错了什么
答案 0 :(得分:6)
你正在让dict
内部带有Request
,Scrapy不会发送它,因为它不知道它在那里(它们在创建后不会自动发送)。您需要生成实际的Request
。
在parse_email
功能中,为了“记住”每封电子邮件所属的项目,您需要将其余的项目数据与请求一起传递。您可以使用meta
参数执行此操作。
示例:
parse
中的:
yield scrapy.Request(url, callback=self.parse_email, meta={'item': {
'name': brickset.css(NAME_SELECTOR).extract_first(),
'address': brickset.css(ADDRESS_SELECTOR).extract_first(),
'phone': brickset.css(PHONE).extract_first(),
'website': brickset.css(WEBSITE).extract_first(),
}})
parse_email
中的:
item = response.meta['item'] # The item this email belongs to
item['email'] = response.xpath(EMAIL_SELECTOR).extract_first().replace('mailto:', '')
return item