Scraper：在迭代之间添加延迟

Question

对于抓取项目，我想在脚本的每次迭代之间添加 1 秒的延迟。在其他线程中，我已经读到可以通过 "time" 功能包含延迟。

然而，下面的代码尽管包含 "time" 仍然每秒处理多个请求，这对于抓取器来说太快了。有谁知道如何使1秒延迟正常工作？

import scrapy
import time

custom_settings = {
'ROBOTSTXT_OBEY': False,
'USER_AGENT': "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.1 (KHTML, like Gecko) Chrome/22.0.1207.1 Safari/537.1"
}

class QuotesSpider(scrapy.Spider):
    name = 'spider1'
    allowed_domains = ['google.com']
    start_urls = ['https://www.google.com/search?q=Activision&biw=1280&bih=607&source=lnt&tbs=cdr%3A1%2Ccd_min%3A01%2F01%2F2004%2Ccd_max%3A12%2F31%2F2004&tbm=nws',
                  'https://www.google.com/search?q=Activision&biw=1280&bih=607&source=lnt&tbs=cdr%3A1%2Ccd_min%3A01%2F01%2F2005%2Ccd_max%3A12%2F31%2F2005&tbm=nws',
                  'https://www.google.com/search?q=Activision&biw=1280&bih=607&source=lnt&tbs=cdr%3A1%2Ccd_min%3A01%2F01%2F2006%2Ccd_max%3A12%2F31%2F2006&tbm=nws',
    ]

    def parse(self, response):
        item = {
            'results': response.css('#resultStats::text')[0].extract(),
            'url': response.url,
        }
        yield item
        time.sleep(1)

Answer 1

有一个特殊的设置，称为下载延迟

您可以在 scrapy 文档中阅读更多内容：https://doc.scrapy.org/en/latest/topics/settings.html#download-delay

Scraper：在迭代之间添加延迟

Scraper: Adding Delay between Iterations

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