Hello, John.
I solved this problem after removing below directories manually and re-installed python3-condor package.
/usr/lib64/python3.6/site-packages/htcondor
/usr/lib64/python3.6/site-packages/htcondor-10.0.0-py3.6.egg-info
/usr/lib64/python3.6/site-packages/htcondor_cli