我有两个脚本,scraper.py和db_control.py.在scraper.py我有这样的事情：
- ...
- def scrap(category,field,pages,search,use_proxy,proxy_file):
- ...
- loop = asyncio.get_event_loop()
- to_do = [ get_pages(url,params,conngen) for url in urls ]
- wait_coro = asyncio.wait(to_do)
- res,_ = loop.run_until_complete(wait_coro)
- ...
- loop.close()
- return [ x.result() for x in res ]
- ...
在db_control.py中：
- from scraper import scrap
- ...
- while new < 15:
- data = scrap(category,proxy_file)
- ...
- ...
从理论上讲,刮板应该在未知时间开始,直到获得足够的数据.但是当新的不是imidiatelly> 15然后发生此错误：
- File "/usr/lib/python3.4/asyncio/base_events.py",line 293,in run_until_complete
- self._check_closed()
- File "/usr/lib/python3.4/asyncio/base_events.py",line 265,in _check_closed
- raise RuntimeError('Event loop is closed')
- RuntimeError: Event loop is closed
但是如果我只运行一次scrap(),脚本就可以了.所以我想重新创建loop = asyncio.get_event_loop()有一些问题,我尝试了this但没有任何改变.我怎么解决这个问题？当然这些只是我的代码的片段,如果您认为问题可以在其他地方,完整代码可用here.
解决方法
方法
如果它已关闭,则循环并抛出异常.
run_until_complete,run_forever,run_in_executor,create_task,call_at明确检查
如果它已关闭,则循环并抛出异常.
从文档引用 – BaseEvenLoop.close：
This is idempotent and irreversible
除非你有一些(好的)理由,否则你可能只是省略了关闭线：
- def scrap(category,proxy_file):
- #...
- loop = asyncio.get_event_loop()
- to_do = [ get_pages(url,_ = loop.run_until_complete(wait_coro)
- #...
- # loop.close()
- return [ x.result() for x in res ]
如果您希望每次都有一个全新的循环,您必须手动创建它并设置为默认值：
- def scrap(category,proxy_file):
- #...
- loop = asyncio.new_event_loop()
- asyncio.set_event_loop(loop)
- to_do = [ get_pages(url,_ = loop.run_until_complete(wait_coro)
- #...
- return [ x.result() for x in res ]