相关疑难解决方法(0)

我得到的twisted.internet.error.ReactorNotRestartable错误,当我执行下面的代码:

from time import sleep
from scrapy import signals
from scrapy.crawler import CrawlerProcess
from scrapy.utils.project import get_project_settings
from scrapy.xlib.pydispatch import dispatcher

result = None

def set_result(item):
    result = item

while True:
    process = CrawlerProcess(get_project_settings())
    dispatcher.connect(set_result, signals.item_scraped)

    process.crawl('my_spider')
    process.start()

    if result:
        break
    sleep(3)

它第一次起作用,然后我得到错误.我process每次创建变量,那么问题是什么？