How to avoid storing duplicate resultsHow to prevent duplicates on Scrapy fetching depending on an existing JSON listReplay a Scrapy spider on stored dataHeadless Browser and scraping - solutionsCrawl and monitor +1000 websitesRunning Scrapy daily and tracking changes in the dataAdding Scrapy request URL into Parsed ArrayBuffered pipeline using scrapyPython/Scrapy: Extracting xpath from Ebay's dynamic description fieldScraping Multiple Websites with Single Spider using ScrapyScrapy Crawler excel outputStoring Scrapped data in csv

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How to avoid storing duplicate results


How to prevent duplicates on Scrapy fetching depending on an existing JSON listReplay a Scrapy spider on stored dataHeadless Browser and scraping - solutionsCrawl and monitor +1000 websitesRunning Scrapy daily and tracking changes in the dataAdding Scrapy request URL into Parsed ArrayBuffered pipeline using scrapyPython/Scrapy: Extracting xpath from Ebay's dynamic description fieldScraping Multiple Websites with Single Spider using ScrapyScrapy Crawler excel outputStoring Scrapped data in csv






.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;








0















I store scraped content within a csv file.
Each row contains a unique ID and description of an item.



My ID is coming from the website where I scrap the content and not generated on the scraper side.



I use Scrapy's feedExporter to generate the csv file



When I scrap again my website, I would like my script to check if unique ID is already stored within the csv file, if it's not I would add the new row, if it is I will just move on to the next item.



As I assume this is a classic thing to do with a scraping framework I believe there must be a smart way to do it with Scrapy however I can't find anything on this topic within the Scrapy's documentation



Should I simply open the csv file, go through each item and if iterator's value not present add a new row or skip if it is?










share|improve this question






















  • Possible duplicate of How to prevent duplicates on Scrapy fetching depending on an existing JSON list

    – Gallaecio
    Mar 26 at 7:11






  • 1





    doc.scrapy.org/en/latest/topics/…

    – Gallaecio
    Mar 26 at 7:13











  • Apart from the example that @Gallaecio linked, if you use distributed system like Scrapy Cluster, you might want to use something like Redis to hold the set of seen IDs.

    – Tomáš Linhart
    Mar 27 at 13:52

















0















I store scraped content within a csv file.
Each row contains a unique ID and description of an item.



My ID is coming from the website where I scrap the content and not generated on the scraper side.



I use Scrapy's feedExporter to generate the csv file



When I scrap again my website, I would like my script to check if unique ID is already stored within the csv file, if it's not I would add the new row, if it is I will just move on to the next item.



As I assume this is a classic thing to do with a scraping framework I believe there must be a smart way to do it with Scrapy however I can't find anything on this topic within the Scrapy's documentation



Should I simply open the csv file, go through each item and if iterator's value not present add a new row or skip if it is?










share|improve this question






















  • Possible duplicate of How to prevent duplicates on Scrapy fetching depending on an existing JSON list

    – Gallaecio
    Mar 26 at 7:11






  • 1





    doc.scrapy.org/en/latest/topics/…

    – Gallaecio
    Mar 26 at 7:13











  • Apart from the example that @Gallaecio linked, if you use distributed system like Scrapy Cluster, you might want to use something like Redis to hold the set of seen IDs.

    – Tomáš Linhart
    Mar 27 at 13:52













0












0








0








I store scraped content within a csv file.
Each row contains a unique ID and description of an item.



My ID is coming from the website where I scrap the content and not generated on the scraper side.



I use Scrapy's feedExporter to generate the csv file



When I scrap again my website, I would like my script to check if unique ID is already stored within the csv file, if it's not I would add the new row, if it is I will just move on to the next item.



As I assume this is a classic thing to do with a scraping framework I believe there must be a smart way to do it with Scrapy however I can't find anything on this topic within the Scrapy's documentation



Should I simply open the csv file, go through each item and if iterator's value not present add a new row or skip if it is?










share|improve this question














I store scraped content within a csv file.
Each row contains a unique ID and description of an item.



My ID is coming from the website where I scrap the content and not generated on the scraper side.



I use Scrapy's feedExporter to generate the csv file



When I scrap again my website, I would like my script to check if unique ID is already stored within the csv file, if it's not I would add the new row, if it is I will just move on to the next item.



As I assume this is a classic thing to do with a scraping framework I believe there must be a smart way to do it with Scrapy however I can't find anything on this topic within the Scrapy's documentation



Should I simply open the csv file, go through each item and if iterator's value not present add a new row or skip if it is?







scrapy






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked Mar 25 at 23:18









jeanjean

699 bronze badges




699 bronze badges












  • Possible duplicate of How to prevent duplicates on Scrapy fetching depending on an existing JSON list

    – Gallaecio
    Mar 26 at 7:11






  • 1





    doc.scrapy.org/en/latest/topics/…

    – Gallaecio
    Mar 26 at 7:13











  • Apart from the example that @Gallaecio linked, if you use distributed system like Scrapy Cluster, you might want to use something like Redis to hold the set of seen IDs.

    – Tomáš Linhart
    Mar 27 at 13:52

















  • Possible duplicate of How to prevent duplicates on Scrapy fetching depending on an existing JSON list

    – Gallaecio
    Mar 26 at 7:11






  • 1





    doc.scrapy.org/en/latest/topics/…

    – Gallaecio
    Mar 26 at 7:13











  • Apart from the example that @Gallaecio linked, if you use distributed system like Scrapy Cluster, you might want to use something like Redis to hold the set of seen IDs.

    – Tomáš Linhart
    Mar 27 at 13:52
















Possible duplicate of How to prevent duplicates on Scrapy fetching depending on an existing JSON list

– Gallaecio
Mar 26 at 7:11





Possible duplicate of How to prevent duplicates on Scrapy fetching depending on an existing JSON list

– Gallaecio
Mar 26 at 7:11




1




1





doc.scrapy.org/en/latest/topics/…

– Gallaecio
Mar 26 at 7:13





doc.scrapy.org/en/latest/topics/…

– Gallaecio
Mar 26 at 7:13













Apart from the example that @Gallaecio linked, if you use distributed system like Scrapy Cluster, you might want to use something like Redis to hold the set of seen IDs.

– Tomáš Linhart
Mar 27 at 13:52





Apart from the example that @Gallaecio linked, if you use distributed system like Scrapy Cluster, you might want to use something like Redis to hold the set of seen IDs.

– Tomáš Linhart
Mar 27 at 13:52












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