Python scrapy pipelines 里面的 item 怎么按里面的一个字段值排序? - V2EX
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bb2018

Python scrapy pipelines 里面的 item 怎么按里面的一个字段值排序?

  •  
  •   bb2018 May 10, 2017 4456 views
    This topic created in 3284 days ago, the information mentioned may be changed or developed.
    比如 item 里面有一个 infoid 的字段。item['infoid'] 对应的是一些数据。

    怎么在 pipelines 里通过 item['infoid'] 对应的值给 item 排序后再让后面的 pipelines 处理它?

    sorted(item.items(), key=lambda infoid:infoid[1])

    这样排序后总是提示:TypeError: stringindicesmustbeintegers,notstr
    不知道还有什么办法可以在 pipelines 里存入数据库前给 item 按相应的字段值排序后再处理?
    5 replies    2017-05-11 10:01:08 +08:00
    knightdf
        1
    knightdf  
       May10, 2017
    pipeline 处理 item 应该是无序的,只是 pipeline 有权重高低顺序之分
    dsg001
        2
    dsg001  
       May 10, 2017
    使用 orderdict 排序吧
    zsz
        3
    zsz  
       May 10, 2017
    pipelines 处理数据本身就是根据数据获取的顺序处理(流式),如果抓取的数据比较少,可以缓存到 cache 中,最后排序入库,不然还是直接入库,用 infoid 建立一个索引字段
    freestyle
        4
    freestyle  
       May 11, 2017
    sorted(item.items(), key=lambda i:i["infoid"])
    freestyle
        5
    freestyle  
       May 11, 2017
    4#回复错了
    data = item.items()
    sorted(data, key=lambda i:i["infoid"])
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