Scrapy Item Processors - Process values before storing
Web scraping is the process of scraping or extracting data from websites using programs or other tools. And in this video lesson, we will learn how to populate data in items.
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An Item Loader contains one input processor and one output processor for each (item) field. The input processor processes the extracted data as soon as it’s received (through the add_xpath(), add_css(), or add_value() methods), and the result of the input processor is collected and kept inside the ItemLoader. After collecting all data, the ItemLoader.load_item() method is called to populate and get the populated item object. That’s when the output processor is called with the data previously collected (and processed using the input processor). The result of the output processor is the final value that gets assigned to the item.
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