django+apscheduler+scrapy

通过apscheduler调用scrapy的spider会报错：
Error:builtins.ValueError: signal only works in main thread

按以下地址方案可以解决:
https://stackoverflow.com/questions/53605039/apschedulerscrapy-signal-only-works-in-main-thread

但使用django时，该方案中的BlockingScheduler()会阻塞django主进程启动，
将BlockingScheduler()替换为BackgroundScheduler()或TwistedScheduler()即可。

from apscheduler.schedulers.background import BackgroundScheduler

import crochet
crochet.setup()

settings = get_project_settings()
configure_logging(settings)
runner = CrawlerRunner(settings)

# Note: Removing defer here for the example
# @defer.inlineCallbacks

@crochet.run_in_reactor
def crawl():
    runner.crawl(Jobaispider)#this is my spider
    runner.crawl(Jobpythonspider)#this is my spider

# sched = BlockingScheduler()
sched = BackgroundScheduler()
sched.add_job(crawl, 'date', run_date=datetime(2018, 12, 4, 10, 45, 10))
sched.start()