25.scrapy中setting和管道的深入理解

Setting:

Enable and configure the AutoThrottle extension(启用限速,防止爬取过快)

每一块都有对应的官方文档详细说明。

Pipeline:#以下方法可用于数据库的开启和关闭。

Def open_spider(self,spider):#在爬虫开启的时候执行,仅执行一次

Self.file = open(spider.settings.get(“SAVE_FILE”,”./temp.json”),’w’)

Def close_spider(self,spider):#爬虫关闭时候执行,仅执行一次

Self.file.close()

Class类的理解还不是很深刻,要再读读看

15,963 thoughts on “25.scrapy中setting和管道的深入理解

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