^CTraceback (most recent call last):

 "graceful_shutdown.py", line 27, in <module>
run()

 "graceful_shutdown.py", line 20, in run
loop.run_until_complete(app.shutdown())AttributeError: 'Application' object has no attribute 'shutdown'
Traceback (most recent call last):


 "/python/env/lib/python3.6/site-packages/eventlet/hubs/hub.py", line 460, in fire_timers

timer()


 "/python/env/lib/python3.6/site-packages/eventlet/hubs/timer.py", line 59, in __call__

cb(*args, **kw)
SystemError: <built-in method switch of GreenThread object at 0x7000000014f35a0> returned NULL without setting an error
