• scrapy item pipeline


    1. item pipeline
    process_item(self, item, spider) #这个是所有pipeline都必须要有的方法
    在这个方法下再继续编辑具体怎么处理

    另可以添加别的方法

    open_spider(self, spider)  This method is called when the spider is opened.
    close_spider(self, spider) This method is called when the spider is closed.
    from_crawler(cls, crawler)
    open_spider(self, spider):在spider打开时(数据爬取前)调用该函数,该函数通常用于数据爬取前的某些初始化工作,如打开数据库连接;
    close_spider(self, spider):在spider关闭时(数据爬取后)调用该函数,该函数通常用于数据爬取前的清理工作,如关闭数据库连接;
    from_crawler(cls, crawler):类方法,其返回一个ItemPipeline对象,如果定义了该方法,那么scrapy会通过该方法创建ItemPipeline对象;通常,在该方法中通过crawler.settings获取项目的配置文件,根据配置生成对象
     @classmethod
        def from_crawler(cls, crawler):
            file_name = crawler.settings.get('FILE_NAME')
            # file_name = scrapy.conf.settings['FILE_NAME'] #这种方式也可以获取到配置
            return cls(file_name)
    作者:喵帕斯0_0 链接:https://www.jianshu.com/p/256bc96c9b6d 来源:简书 简书著作权归作者所有,任何形式的转载都请联系作者获得授权并注明出处。
    1. enabled pipelines []是空的,虽然定义了正确的pipeline名字,但是filepipeline ,用了IMAGES_STORE,不匹配,所以直接就没有接入filepipeline
    
    
    -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- focus on what you want to be
  • 相关阅读:
    A1126 Eulerian Path (25分)
    A1125 Chain the Ropes (25分)
    A1124 Raffle for Weibo Followers (20分)
    A1123 Is It a Complete AVL Tree (30分)
    A1122 Hamiltonian Cycle (25分)
    A1121 Damn Single (25分)
    A1120 Friend Numbers (20分)
    A1119 Pre- and Post-order Traversals (30分)
    总的调试开关
    sourceInsight
  • 原文地址:https://www.cnblogs.com/bamboozone/p/10479696.html
Copyright © 2020-2023  润新知