22.scrapy之items.py详解

发现scrapy内容实在太多,于是新开篇章继续记录。

看来会读点源码还是必要的(虽然我现在还不会),在spider文件夹中的爬虫主py文件里,我们有创建过一个字典叫item={},然后在下方定义了几个键和其对应要获取的对象数据。这是大背景。

一个完整的scrapy框架里,如果别人要来接手或者来看一下代码,就可以直接去items.py里看看要获取的字段都有哪些了。算是书写更加规范了,也就是先定义我的目标,再去写代码。

用法:

  • 先from 文件夹 import items.py
  • Items.py里定义字段,如title=scrapy.Field()  / #scrapy.Field()是一个字典
  • 实例化 item = 项目名Item()
  • 再根据前面定义的字段,书写获取路径和规则
  • pineline里原有的item这个时候变成了对象,所以写为dict(item)强行变为字典才能储存入mongodb
  • 还可以用isinstance(item,Myspideritem)来判断数据是术语哪一个item,进行不同的数据处理

需要注意的一个知识点,在爬取3层循环的内容时候,容易出现多次使用item的情况,在字典里,存在一个引用的概念,即:

A= B

A = {a:1,b:100}

B[1] =20

则 A也会跟着变化

所以在yield中,传item需要加上这样的语法:

meta = {“item”:deepcopy(item)}

9,702 thoughts on “22.scrapy之items.py详解

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