[英]Access items yielded by my spider when running Scrapy from script
我正在从 Python 脚本调用 Scrapy Spider 。 我想访问 Spider 从我的脚本中产生的项目。 但我不知道该怎么做。
脚本工作正常,蜘蛛被调用并产生正确的项目,但我不知道如何从我的脚本访问这些项目。
这是脚本的代码
Class UASpider(scrapy.Spider):
name = 'uaspider'
start_urls = ['http://httpbin.org/user-agent']
def parse(self, response):
payload = json.loads(response.body.decode(response.encoding))
yield {'ua':payload}
def main():
process = CrawlerProcess(get_project_settings())
process.crawl(UASpider)
process.start() # the script will block here until the crawling is finished
if (__name__ == '__main__'):
main()
这是日志的一部分,显示蜘蛛工作正常并产生项目。
2020-02-18 20:44:10 [scrapy.core.engine] INFO: Spider opened
2020-02-18 20:44:10 [scrapy.extensions.logstats] INFO: Crawled 0 pages (at 0 pages/min), scraped 0 items (at 0 items/min)
2020-02-18 20:44:10 [scrapy.extensions.telnet] INFO: Telnet console listening on 127.0.0.1:6023
2020-02-18 20:44:10 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://httpbin.org/user-agent> (referer: None)
2020-02-18 20:44:10 [scrapy.core.scraper] DEBUG: Scraped from <200 http://httpbin.org/user-agent>
{'ua': {'user-agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36'}}
2020-02-18 20:44:10 [scrapy.core.engine] INFO: Closing spider (finished)
非常感谢您的帮助!!
我能想到的一种选择是创建一个存储项目的管道,然后从该存储访问项目:
我已经按照@Gallaecio 的建议设法完成了这项工作,谢谢!!
此解决方案使用将值存储在全局变量中的管道。 从 Scrapy 项目中读取设置,并在脚本中添加额外的管道以避免更改整体设置。
这是使其工作的代码
user_agent = ''
Class UASpider(scrapy.Spider):
name = 'uaspider'
start_urls = ['http://httpbin.org/user-agent']
def parse(self, response):
payload = json.loads(response.body.decode(response.encoding))
yield {'ua':payload}
class TempStoragePipeline(object):
def process_item(self, item, spider):
user_agent = item.get('ua').get('user-agent')
return item
def main():
settings = get_project_settings()
settings.set('ITEM_PIPELINES', {
'__main__.TempStoragePipeline': 100
})
process = CrawlerProcess(get_project_settings())
process.crawl(UASpider)
process.start() # the script will block here until the crawling is finished
if (__name__ == '__main__'):
print(f'>>> {user_agent}'
main()
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