blocks|key|865158|text|我也遇到过这个问题。https://docs.scrapy.org/en/latest/topics/practices.html的文档似乎不正确，因为每个新的爬行器都尝试加载一个新的反应堆实例，如果给它一个蜘蛛，那么就可以使用CrawlerProcess来运行由蜘蛛构建的多个爬虫。我能够通过使用CrawlerRunner来让我的代码工作，这一点在同一页中也有详细介绍。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|865159|import+scrapy
from+twisted.internet+import+reactor
from+scrapy.crawler+import+CrawlerRunner
from+scrapy.utils.log+import+configure_logging
from+scrapy.utils.project+import+get_project_settings

class+MySpider1(scrapy.Spider):
++++#+Your+first+spider+definition
++++...

class+MySpider2(scrapy.Spider):
++++#+Your+second+spider+definition
++++...

configure_logging()
settings+=+get_project_settings()+#+settings+not+required+if+running
runner+=+CrawlerRunner(settings)++#+from+script,+defaults+provided
runner.crawl(MySpider1)+#+your+loop+would+go+here
runner.crawl(MySpider2)
d+=+runner.join()
d.addBoth(lambda+_:+reactor.stop())
reactor.run()+#+the+script+will+block+here+until+all+crawling+jobs+are+finished|code-block|syntax|javascript|865160|entityMap|0|LINK|mutability|MUTABLE|url|https://docs.scrapy.org/en/latest/topics/practices.html^0|A|1J|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

I've just run into this issue as well. It appears that the docs at <a href="https://docs.scrapy.org/en/latest/topics/practices.html" rel="nofollow noreferrer">https://docs.scrapy.org/en/latest/topics/practices.html</a> are incorrect in stating that CrawlerProcess can be used to run multiple crawlers built with spiders, since each new crawler attempts to load a new reactor instance if you give it a spider. I was able to get my code to work by using CrawlerRunner instead, as also detailed on the same page.
<pre><code>import scrapy
from twisted.internet import reactor
from scrapy.crawler import CrawlerRunner
from scrapy.utils.log import configure_logging
from scrapy.utils.project import get_project_settings

class MySpider1(scrapy.Spider):
 # Your first spider definition
 ...

class MySpider2(scrapy.Spider):
 # Your second spider definition
 ...

configure_logging()
settings = get_project_settings() # settings not required if running
runner = CrawlerRunner(settings) # from script, defaults provided
runner.crawl(MySpider1) # your loop would go here
runner.crawl(MySpider2)
d = runner.join()
d.addBoth(lambda _: reactor.stop())
reactor.run() # the script will block here until all crawling jobs are finished
</code></pre>

blocks|key|393690|text|此解决方案避免使用文档中所述的CrawlerProcess。https://docs.scrapy.org/en/latest/topics/practices.html#run-scrapy-from-a-script|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|393691|393692|还有另一个Scrapy实用程序，它提供了对爬行过程的更多控制:+scrapy.crawler.CrawlerRunner。这个类是一个薄包装，封装了一些简单的帮助程序来运行多个爬行器，但它不会以任何方式启动或干扰现有的反应堆。如果您的应用程序已经在使用Twisted，并且希望在同一个反应堆中运行Scrapy，则建议您使用CrawlerRunner而不是CrawlerProcess。|blockquote|393693|393694|393695|from+twisted.internet+import+reactor
from+scrapy.crawler+import+CrawlerRunner
from+scrapy.utils.project+import+get_project_settings
from+scrapy.utils.log+import+configure_logging

from+football.spiders.laliga+import+LaligaSpider

#+Enable+logging+for+CrawlerRunner
configure_logging()

runner+=+CrawlerRunner(settings=get_project_settings())
for+i+in+range(1,+29):
++++runner.crawl(LaligaSpider,+**{'week':+i})

deferred+=+runner.join()
deferred.addBoth(lambda+_:+reactor.stop())

reactor.run()++#+the+script+will+block+here+until+all+crawling+jobs+are+finished|code-block|syntax|javascript|393696|entityMap|0|LINK|mutability|MUTABLE|url|https://docs.scrapy.org/en/latest/topics/practices.html#run-scrapy-from-a-script^0|U|28|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@$A|X|B|Y|1|Z]]|C|$]]|$1|D|3|-4|5|6|7|10|8|@]|9|@]|C|$]]|$1|E|3|F|5|G|7|11|8|@]|9|@]|C|$]]|$1|H|3|-4|5|6|7|12|8|@]|9|@]|C|$]]|$1|I|3|-4|5|6|7|13|8|@]|9|@]|C|$]]|$1|J|3|K|5|L|7|14|8|@]|9|@]|C|$M|N]]|$1|O|3|-4|5|6|7|15|8|@]|9|@]|C|$]]]|P|$Q|$5|R|S|T|C|$U|V]]]]

This solution avoids use of CrawlerProcess as stated in the docs.
<a href="https://docs.scrapy.org/en/latest/topics/practices.html#run-scrapy-from-a-script" rel="nofollow noreferrer">https://docs.scrapy.org/en/latest/topics/practices.html#run-scrapy-from-a-script</a>
<blockquote>
There’s another Scrapy utility that provides more control over the crawling process: scrapy.crawler.CrawlerRunner. This class is a thin wrapper that encapsulates some simple helpers to run multiple crawlers, but it won’t start or interfere with existing reactors in any way.
</blockquote>
<blockquote>
It’s recommended you use CrawlerRunner instead of CrawlerProcess if your application is already using Twisted and you want to run Scrapy in the same reactor.
</blockquote>
<pre><code>from twisted.internet import reactor
from scrapy.crawler import CrawlerRunner
from scrapy.utils.project import get_project_settings
from scrapy.utils.log import configure_logging

from football.spiders.laliga import LaligaSpider

# Enable logging for CrawlerRunner
configure_logging()

runner = CrawlerRunner(settings=get_project_settings())
for i in range(1, 29):
 runner.crawl(LaligaSpider, **{'week': i})

deferred = runner.join()
deferred.addBoth(lambda _: reactor.stop())

reactor.run() # the script will block here until all crawling jobs are finished
</code></pre>

blocks|key|551973|text|对我来说，这是可行的，我把它放在CrawlerProcess之前|type|unstyled|depth|inlineStyleRanges|entityRanges|data|551974|import+sys++++
if+"twisted.internet.reactor"+in+sys.modules:
++++del+sys.modules["twisted.internet.reactor"]|code-block|syntax|javascript|551975|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

For me this worked, I put it before the CrawlerProcess
<pre class="lang-py prettyprint-override"><code>import sys 
if &quot;twisted.internet.reactor&quot; in sys.modules:
 del sys.modules[&quot;twisted.internet.reactor&quot;]
</code></pre>

blocks|key|551996|text|我遇到过这个问题，但是它是在更新Scrapy和Twisted之后解决的。包的当前版本。Twisted==22.8.0+Scrapy==2.6.2|type|unstyled|depth|inlineStyleRanges|entityRanges|data|551997|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I have encountered this problem, but it is solved after updating both Scrapy and Twisted.
the current version of the packages.
Twisted==22.8.0
Scrapy==2.6.2

I am having this error when I run a crawl process multiples times.
I am using scrapy 2.6
This is my code:
<pre><code>from scrapy.crawler import CrawlerProcess
from football.spiders.laliga import LaligaSpider
from scrapy.utils.project import get_project_settings

process = CrawlerProcess(settings=get_project_settings())
for i in range(1, 29):
 process.crawl(LaligaSpider, **{'week': i})
process.start()
</code></pre>

twisted.internet.error.ReactorAlreadyInstalledError: reactor already installed

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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当我多次运行爬行进程时，会出现此错误。我正在使用scrapy2.6，这是我的代码：from scrapy.crawler import CrawlerProcessfrom football.spiders.laliga import LaligaSpiderfrom scrapy.utils.project impo...

问twisted.internet.error.ReactorAlreadyInstalledError:反应堆已经安装
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