python in ignored错误

引用：

http://stackoverflow.com/questions/8774958/keyerror-in-module-threading-after-a-successful-py-test-run

(env)czajnik@autosan:~$ python test.py 
Exception KeyError: KeyError(139924387112272,) in <module 'threading' from '/usr/lib/python2.7/threading.pyc'> ignored

import sys
if 'threading' in sys.modules:
    del sys.modules['threading']
import gevent
import gevent.socket
import gevent.monkey
gevent.monkey.patch_all()