我有一个这样的爬虫:
class SkySpider(CrawlSpider):
name = "spider_v1"
allowed_domains = [
"atsu.edu",
]
start_urls = [
"http://www.atsu.edu",
]
rules = (
Rule(
INFO_LINKS_EXTRACTOR,
follow=True,
callback='parse_item',
),
)
def parse_item(self, response):
print("ENTERED!")
item = SportsScraperItem()
item["contact"] = self._parse_contact(response)
return item
在myhelpers.py中,我有:
from scrapy.linkextractors import LinkExtractor
def _r(string):
return f"(.*?)(\b{string}\b)(.*)"
INFO_LINKS_EXTRACTOR = LinkExtractor(
allow=(
_r('about'),
),
unique=True,
)
我知道atsu.edu有一个链接https://www.atsu.edu/about-atsu/,但是我的提取器似乎没有看到它,parse_item()
方法没有运行。我做错什么了?
编辑1:
日志:
2019-10-01 15:40:58 [scrapy.core.engine] INFO: Spider opened
2019-10-01 15:40:58 [scrapy.extensions.logstats] INFO: Crawled 0 pages (at 0 pages/min), scraped 0 items (at 0 items/min)
2019-10-01 15:40:58 [steppersspider_v1] INFO: Spider opened: steppersspider_v1
2019-10-01 15:40:58 [scrapy.extensions.telnet] INFO: Telnet console listening on 127.0.0.1:6023
2019-10-01 15:40:59 [scrapy.downloadermiddlewares.redirect] DEBUG: Redirecting (301) to <GET https://www.atsu.edu/robots.txt> from <GET http://WWW.ATSU.EDU/robots.txt>
2019-10-01 15:41:05 [scrapy.core.engine] DEBUG: Crawled (200) <GET https://www.atsu.edu/robots.txt> (referer: None)
2019-10-01 15:41:11 [scrapy.downloadermiddlewares.redirect] DEBUG: Redirecting (301) to <GET https://www.atsu.edu/> from <GET http://WWW.ATSU.EDU>
2019-10-01 15:41:15 [scrapy.core.engine] DEBUG: Crawled (200) <GET https://www.atsu.edu/robots.txt> (referer: None)
2019-10-01 15:41:19 [scrapy.core.engine] DEBUG: Crawled (200) <GET https://www.atsu.edu/> (referer: None)
2019-10-01 15:41:19 [steppersspider_v1] DEBUG: Saved file steppers-www.atsu.edu.html
2019-10-01 15:41:20 [scrapy.core.engine] INFO: Closing spider (finished)
2019-10-01 15:41:20 [scrapy.statscollectors] INFO: Dumping Scrapy stats:
编辑2 Here是我在regexp101.com上测试这个regexp的方法
编辑3
regexp的工作函数:
def _r(string):
return r"^(.*?)(\b{string}\b)(.*)$".format(string=string)
默认情况下,链接提取器只搜索
a
和area
标记。您要查找的链接似乎位于li
标记中您需要将
tags
参数传递给带有所需标记的链接提取器的构造函数。例如:见https://doc.scrapy.org/en/latest/topics/link-extractors.html#module-scrapy.linkextractors.lxmlhtml
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