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How to pass a user defined argument in scrapy spider

class VisualScrapySpider(scrapy.Spider):
    name = 'visualscrapy'

    def __init__(self, category='', **kwargs):
        self.start_urls = [f'http://www.visualscrapy.com/search?query={category}']
        super().__init__(**kwargs)

#scrapy crawl visualscrapy -a category=<search_parameter>

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