Scrapy学习-4-Items类&Pipelines类

items类使用

作用

　　能使得我们非常方便的操作字段名

在items.py中定制我们的类

class ArticleItem(scrapy.Item):

    title = scrapy.Field()

    create_time = scrapy.Field()

    url = scrapy.Field()

    url_id = scrapy.Field()

    front_image_url = scrapy.Field()

    front_image_path = scrapy.Field()

    praise_nums = scrapy.Field()

    comment_nums = scrapy.Field()

    fav_nums = scrapy.Field()

    tags = scrapy.Field()

    content = scrapy.Field()

 

在spider项目中导入ArticleItem

def parse(self, response):

    article_item = ArticleItem()

    article_item['title'] = title

    article_item['create_time'] = create_time

    article_item['url'] = url

    import hashlib

    m = hashlib.md5()

    m.update(url)

    article_item['url_id'] = m.hexdigest()

    article_item['praise_nums'] = praise_nums

    article_item['comment_nums'] = comment_nums

    article_item['fav_nums'] = fav_nums

    article_item['tags'] = tags

    article_item['front_image_url'] = front_image_url

    article_item['content'] = content

    yield article_item

 

Pipelines类

步骤　　

　　在parse中使用items做值填充,并传递到pipelines做数据处理

 

默认类

class ArticlespiderPipeline(object):
    def process_item(self, item, spider):
        return item