Cannot import name 'Protocol' from 'couchbase_core._pyport'

Tests are failing due to the following error in the python SDK: 

Similar issue seen when we run this locally.
 

>>> from couchbase.cluster import Cluster

Traceback (most recent call last):

  File "<stdin>", line 1, in <module>

  File "/Users/jyotsna/anaconda3/lib/python3.7/site-packages/couchbase/cluster.py", line 5, in <module>

    from couchbase.management.queries import QueryIndexManager

  File "/Users/jyotsna/anaconda3/lib/python3.7/site-packages/couchbase/management/queries.py", line 8, in <module>

    from couchbase_core._pyport import Protocol

ImportError: cannot import name 'Protocol' from 'couchbase_core._pyport' (/Users/jyotsna/anaconda3/lib/python3.7/site-packages/couchbase_core/_pyport.py)

link to a job with a similar stack trace :
http://perf.jenkins.couchbase.com/view/FTS/job/atlas_collections/767/*
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