python-rfc3986 from Cloud:OTC:Tools:OpenStack project
Select Your Operating System
Add repository and install manually
For CentOS 8 run the following as root:
cd /etc/yum.repos.d/ wget https://download.opensuse.org/repositories/Cloud:OTC:Tools:OpenStack/CentOS_8/Cloud:OTC:Tools:OpenStack.repo yum install python-rfc3986