python - 使用python scrapy从网页中提取链接

Question

我是Python初学者，使用scrapy从以下网页中提取链接 http://www.basketball-reference.com/leagues/NBA_2015_games.html .

我写的代码是

from scrapy.contrib.spiders import CrawlSpider, Rule
from scrapy.contrib.linkextractors import LinkExtractor
from basketball.items import BasketballItem

class BasketballSpider(CrawlSpider):

   name = 'basketball'
   allowed_domains = ['basketball-reference.com/']
   start_urls = ['http://www.basketball-reference.com/leagues/NBA_2015_games.html']
   rules = [Rule(LinkExtractor(allow=['http://www.basketball-reference.com/boxscores/^\w+$']), 'parse_item')]

   def parse_item(self, response):
       item = BasketballItem()
       item['url'] = response.url
       return item

我通过命令提示符运行此代码，但创建的文件没有任何链接。有人可以帮忙吗？

Answer 1

找不到链接，请修复规则中的正则表达式:

rules = [
    Rule(LinkExtractor(allow='boxscores/\w+'))
]

此外，当调用 parse_item 时，您不必设置 callback - 这是默认设置。

并且allow也可以设置为字符串。