error eventlet 0.24.1
ContextualVersionConflict: (eventlet 0.24.1 (/usr/local/lib/python2.7/dist-packages); Requirement.parse('eventlet!=0.18.3, !=0.20.1, <0.21.0, >=0.18.2'), set(['os-win']))
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I have installed both python 3.5 and python 2.7 and pip 19.1. I am installing Devstack master