gevent.hub.LoopExit: (‘This operation would block forever’, <Hub at 0x1076b7e10 select default pending=0 ref=0 resolver=<gevent.resolver_thread.Resolver at 0x1077eec90 pool=<ThreadPool at 0x1077eecd0 0/10/10» threadpool=<ThreadPool at 0x1077eecd0 0/10/10»)

http://xiaorui.cc/2016/08/07/%E5%85%B3%E4%BA%8Egevent-queue%E9%81%AD%E9%81%87hub-loopexit%E9%97%AE%E9%A2%98/