解决ImportError: cannot import name 'ALREADY_HANDLED' from 'eventlet.wsgi'

报错如图:

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File "/XXXX/site-packages/gunicorn/workers/geventlet.py", line 20, in 
from eventlet.wsgi import ALREADY_HANDLED as EVENTLET_ALREADY_HANDLED
ImportError: cannot import name 'ALREADY_HANDLED' from 'eventlet.wsgi'
(/XXXX/site-packages/eventlet/wsgi.py)

解决办法是安装指定版本的eventlet:

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pip3 install eventlet==0.30.2