scrapy Archives - 俺的BLOG

Scrapy爬取内容去重

使用以下pipeline即可：

from scrapy.exceptions import DropItem

class DuplicatesPipeline(object):

    def __init__(self):
        self.ids_seen = set()

    def process_item(self, item, spider):
        if item['id'] in self.ids_seen:
            raise DropItem("Duplicate item found: %s" % item)
        else:
            self.ids_seen.add(item['id'])
            return item

from scrapy.exceptions import DropItem

class DuplicatesPipeline(object):

def __init__(self):

self.ids_seen = set()

def process_item(self, item, spider):

if item['id'] in self.ids_seen:

raise DropItem("Duplicate item found: %s" % item)

else:

self.ids_seen.add(item['id'])

return item

【摘自：】https://docs.scrapy.org/en/latest/topics/item-pipeline.html#duplicates-filter

爬虫学习

找了些不错的爬虫平台，学习参考：

JS版爬虫：

1.http://www.shenjianshou.cn/

2.https://github.com/ShenJianShou/crawler_samples

Python版爬虫：

http://scrapy.org/

PHP版获取页面内容：

http://sourceforge.net/projects/simplehtmldom/

.Net版爬虫：

http://www.locoy.com/

http://www.bazhuayu.com/